OpenCores
URL https://opencores.org/ocsvn/System09/System09/trunk

Subversion Repositories System09

[/] [System09/] [trunk/] [src/] [sys09bug/] [sys09bug.asm] - Blame information for rev 158

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 99 davidgb 
* NAM SYS09BUG12 SYSTEM09 MONITOR
2 
 OPT l
3 
 PAGE
4 
*
5 
* MONITOR PROGRAM FOR THE SOUTHWEST TECHNICAL
6 
* PRODUCTS MP-09 CPU BOARD AS COMMENTED BY....
7 
*
8 
* ALLEN CLARK            WALLACE WATSON
9 
* 2502 REGAL OAKS LANE   4815 EAST 97th AVE.
10 
* LUTZ, FLA. 33549       TEMPLE TERRACE, FLA. 33617
11 
* PH. 813-977-0347       PH. 813-985-1359
12 
*
13 
* MODIFIED TO SBUG09 VER 1.8 BY:  RANDY JARRETT
14 
*                                 2561 NANTUCKET DR APT. E
15 
*                                 ATLANTA, GA  30345
16 
*                                 PH. 404-320-1043
17 
*
18 
* MODIFIED TO SYS09BUG VER 1.0
19 59 davidgb 
* FOR:     SYSTEM09 FPGA SYSTEM
20 
* BY:      JOHN KENT
21 
* DATE:    21ST NOVEMBER 2006
22 
* REMOVED: DISK BOOTS
23 
*          MEMORY TEST
24 
* ADDED:   ADM3A VDU DRIVER
25 99 davidgb 
*
26 
* MODIFIED TO SYS09BUG VER 1.1
27 59 davidgb 
* BY:      JOHN KENT
28 
* DATE:    7TH JANUARY 2007
29 
* ADDED:   'U' USER EXTENTION COMMANDS AT $F000
30 
*          CONDITIONAL ASSEMBLY OF FLOPPY BOOTS
31 
*          AND REALTIME CLOCK
32 
*
33 99 davidgb 
* MODIFIED TO SYS09BUG VER 1.2
34 59 davidgb 
* BY:      JOHN KENT
35 
* DATE:    21ST MAY 2007
36 
* ADDED:   COMPACT FLASH BOOT TO FPGA VERSION
37 
*          REMOVED PORT REDIRECTION ON PUNCH & LOAD
38 99 davidgb 
*
39 59 davidgb 
* Modified to SYS09BUG VER 1.3
40 
* BY:      JOHN KENT
41 
* DATE:    8TH JAN 2008
42 
* ADDED:   CONDITIONALS FOR SPARTAN3E STARTER BOARD
43 
*          WITH ONLY 32K OF RAM
44 
*
45 
* Modified to SYS09BUG VER 1.4
46 
* BY:      JOHN KENT
47 
* DATE:    3RD FEB 2008
48 
* ADDED:   CONDITIONALS FOR XESS BOARD WITH IDE
49 
*          SEPERATE CONDITIONAL FOR S3 STARTER AND B5-X300
50 
*          16 BIT IDE DISK BOOT STRAP ROUTINE
51 99 davidgb 
*
52 
* Modified to SYS09BUG VER 1.5
53 
* BY:      JOHN KENT
54 
* DATE:    7TH SEP 2008
55 
* ADDED:   ADDED "B3-S2+" STRING
56 
*
57 
* Modified to SYS09BUG VER 1.6
58 
* BY:      JOHN KENT
59 
* DATE:    2ND DEC 2008
60 
* ADDED:   ADDED HARDWARE FLOW CONTROL
61 
*
62 59 davidgb 
* CHANGED: SEPARARTED OPTIONS EQUATES AND BODY INTO SEPARATE FILES
63 
*
64 120 dilbert57 
* Modified to SYS09BUG VER 1.7
65 
* BY:     JOHN KENT
66 
* DATE:   16TH OCT 2010
67 
* ADDED:  "DE2-70" STRING
68 
*
69 99 davidgb 
*       *** COMMANDS ***
70 
*
71 
* CONTROL A   = ALTER THE "A" ACCUMULATOR
72 
* CONTROL B   = ALTER THE "B" ACCUMULATOR
73 
* CONTROL C   = ALTER THE CONDITION CODE REGISTER
74 
* CONTROL D   = ALTER THE DIRECT PAGE REGISTER
75 
* CONTROL P   = ALTER THE PROGRAM COUNTER
76 
* CONTROL U   = ALTER USER STACK POINTER
77 
* CONTROL X   = ALTER "X" INDEX REGISTER
78 
* CONTROL Y   = ALTER "Y" INDEX REGISTER
79 
* B hhhh      = SET BREAKPOINT AT LOCATION $hhhh
80 59 davidgb 
* D           = 5.25" MINIFLOPPY BOOT
81 
* E ssss-eeee = EXAMINE MEMORY
82 99 davidgb 
*               FROM STARTING ADDRESS ssss
83 
*               TO ENDING ADDRESS eeee.
84 
* G           = CONTINUE EXECUTION FROM BREAKPOINT OR SWI
85 
* L           = LOAD TAPE
86 
* M hhhh      = EXAMINE AND CHANGE MEMORY LOCATION hhhh
87 
* P ssss-eeee = PUNCH TAPE, START ssss TO END eeee ADDR.
88 
* R           = DISPLAY REGISTER CONTENTS
89 
* S           = DISPLAY STACK FROM ssss TO $DFC0
90 59 davidgb 
* U           = 8" DMAF2 FLOPPY BOOT
91 
* U           = USER EXTENSION COMMANDS AT $F000
92 99 davidgb 
* X           = REMOVE ALL BREAKPOINTS
93 59 davidgb 
*
94 99 davidgb 
*
95 59 davidgb 
***************************************************
96 
*   SYS09BUG VARIABLE SPACE
97 
***************************************************
98 99 davidgb 
*
99 59 davidgb 
        ORG   MONRAM
100 99 davidgb 
STACK   EQU   *         ; TOP OF INTERNAL STACK
101 
NMI     RMB   2         ; USER NMI VECTOR
102 
SWI3    RMB   2         ; SOFTWARE INTERRUPT VECTOR #3
103 
SWI2    RMB   2         ; SOFTWARE INTERRUPT VECTOR #2
104 
FIRQ    RMB   2         ; FAST INTERRUPT VECTOR
105 
IRQ     RMB   2         ; INTERRUPT VECTOR
106 
SWI     RMB   2         ; SOFTWARE INTERRUPT VECTOR
107 
SVCVO   RMB   2         ; SUPERVISOR CALL VECTOR ORGIN
108 
SVCVL   RMB   2         ; SUPERVISOR CALL VECTOR LIMIT
109 59 davidgb 
        IFD DATOPT
110 99 davidgb 
LRARAM  RMB  16         ; LRA ADDRESSES
111 59 davidgb 
        ENDIF DATOPT
112 99 davidgb 
CPORT   RMB   2         ; RE-VECTORABLE CONTROL PORT
113 
ECHO    RMB   1         ; ECHO FLAG
114 
BPTBL   RMB  24         ; BREAKPOINT TABLE BASE ADDR
115 59 davidgb 
        IFD  TRAOPT
116 99 davidgb 
NMISAV  RMB   2         ; NMI Jump Vector Backup
117 
TRACNT  RMB   2         ; Trace Count
118 59 davidgb 
        ENDIF TRAOPT
119 
        IFD VDUOPT
120 
*
121 
**************************************************
122 
*   VDU8 DISPLAY DRIVER VARIABLES                                    *
123 
**************************************************
124 
*
125 
**** ALWAYS KEEP COLADX AND ROWADX TOGETHER ******
126 99 davidgb 
COLADX  RMB   1         ; CURSOR COLUMN
127 
ROWADX  RMB   1         ; CURSOR ROW
128 59 davidgb 
**************************************************
129 
*
130 99 davidgb 
NEWROW  RMB   1         ; NEW ROW TEMP FOR ESCAPE
131 
ESCFLG  RMB   1         ; ESCAPE SEQUENCE ACTIVE
132 59 davidgb 
        ENDIF VDUOPT
133 99 davidgb 
        IFD DG640OPT
134 59 davidgb 
*
135 
***************************************************
136 
*   DG640 MEMORY MAPPED DISPLAY DRIVER VARIABLES  *
137 
***************************************************
138 
*
139 
***** ALWAYS KEEP THESE TWO BYTES TOGETHER *****
140 99 davidgb 
COLADX  RMB   1        ; CURSOR COLUMN
141 
ROWADX  RMB   1        ; CURSOR ROW
142 59 davidgb 
*************************************************
143 99 davidgb 
CURSOR  RMB   2        ; ABSOLUTE SCREEN ADDRESS
144 
NEWROW  RMB   1        ; NEW ROW TEMP FOR ESCAPE
145 
ESCFLG  RMB   1        ; ESCAPE SEQUENCE ACTIVE
146 59 davidgb 
        ENDIF DG640OPT
147 
*
148 
*
149 
***************************************************
150 
*   START OF ROM                                  *
151 
***************************************************
152 
*
153 
        ORG   MONROM
154 99 davidgb 
        FDB   MONITOR
155 
        FDB   NEXTCMD
156 
        FDB   INCH
157 
        FDB   INCHE
158 
        FDB   INCHEK
159 
        FDB   OUTCH
160 
        FDB   PDATA
161 
        FDB   PCRLF
162 
        FDB   PSTRNG
163 
        FDB   LRA
164 
*
165 
        IFD   ADSOPT
166 
        FDB   PCHK     ; CHECK FOR PRINTER INPUT
167 
        FDB   PINIZ    ; INITIATE PRINTER
168 
        FDB   POUTCH   ; OUTPUT CH. TO PRINTER
169 
        FDB   VINIZ
170 
        FDB   VOUTCH
171 
        FDB   ACINIZ
172 
        FDB   AOUTCH
173 59 davidgb 
        ENDIF ADSOPT
174 
*
175 99 davidgb 
* MONITOR
176 59 davidgb 
*
177 99 davidgb 
* VECTOR ADDRESS STRING IS.....
178 
* $F8A1-$F8A1-$F8A1-$F8A1-$F8A1-$FAB0-$FFFF-$FFFF
179 
*
180 
MONITOR LDX   #RAMVEC  ; POINT TO VECTOR ADDR. STRING
181 
        LDY   #STACK   ; POINT TO RAM VECTOR LOCATION
182 
        LDB   #$10     ; BYTES TO MOVE = 16
183 
LOOPA   LDA   ,X+      ; GET VECTOR BYTE
184 
        STA   ,Y+      ; PUT VECTORS IN RAM / $DFC0-$DFCF
185 
        DECB           ; SUBTRACT 1 FROM NUMBER OF BYTES TO MOVE
186 
        BNE   LOOPA    ; CONTINUE UNTIL ALL VECTORS MOVED
187 
*
188 
* CONTENTS     FROM         TO      FUNCTION
189 
*  $F8A1       $FE40      $DFC0     USER-V
190 
*  $F8A1       $FE42      $DFC2     SWI3-V
191 
*  $F8A1       $FE44      $DFC4     SWI2-V
192 
*  $F8A1       $FE46      $DFC6     FIRQ-V
193 
*  $F8A1       $FE48      $DFC8     IRQ-V
194 
*  $FAB0       $FE4A      $DFCA     SWI-V
195 
*  $FFFF       $FE4C      $DFCC     SVC-VO
196 
*  $FFFF       $FE4E      $DFCE     SVC-VL
197 
*
198 
        LDX   #ACIAS
199 
        STX   CPORT    ; STORE ADDR. IN RAM
200 
        LBSR  XBKPNT   ; CLEAR OUTSTANDING BREAKPOINTS
201 
        LDB   #12      ; CLEAR 12 BYTES ON STACK
202 
CLRSTK  CLR   ,-S
203 
        DECB
204 
        BNE   CLRSTK
205 
        LEAX  MONITOR,PCR  ; SET PC TO SBUG-E ENTRY
206 
        STX   10,S    ; ON STACK
207 
        LDA   #$D0    ; PRESET CONDITION CODES ON STACK
208 
        STA   ,S
209 
        TFR   S,U
210 
        LBSR  IOINIZ  ; INITIALIZE CONTROL PORT
211 
        LDX   #MSG1   ; POINT TO MONITOR MESSAGE
212 
        LBSR  PDATA   ; PRINT MSG
213 
*
214 
        IFD   DATOPT
215 
        LDX   #LRARAM ; POINT TO LRA RAM STORAGE AREA
216 
        CLRA  START   ; TOTAL AT ZERO
217 
        LDB   #13     ; TOTAL UP ALL ACTIVE RAM MEMORY
218 
FNDREL  TST   B,X     ; TEST FOR RAM AT NEXT LOC.
219 
        BEQ   RELPAS  ; IF NO RAM GO TO NEXT LOC.
220 
        ADDA  #4      ; ELSE ADD 4K TO TOTAL
221 
        DAA           ; ADJ. TOTAL FOR DECIMAL
222 
RELPAS  DECB          ; SUB. 1 FROM LOCS. TO TEST
223 
        BPL   FNDREL  ; PRINT TOTAL OF RAM
224 
        LBSR  OUT2H   ; OUTPUT HEX BYTE AS ASCII
225 
        LDX   #MSG2   ; POINT TO MSG 'K' CR/LF + 3 NULS
226 
        LBSR  PDATA   ; PRINT MSG
227 59 davidgb 
        ENDIF DATOPT
228 
*
229 99 davidgb 
        IFD   TRAOPT
230 
        LBSR  TRAINZ
231 59 davidgb 
        ENDIF TRAOPT
232 99 davidgb 
*
233 
***** NEXTCMD *****
234 
*
235 
NEXTCMD LDX  #MSG3   ; POINT TO MSG ">"
236 
        LBSR PSTRNG  ; PRINT MSG
237 
        LBSR INCH    ; GET ONE CHAR. FROM TERMINAL
238 
        ANDA #$7F    ; STRIP PARITY FROM CHAR.
239 
        CMPA #$0D    ; IS IT CARRIAGE RETURN ?
240 
        BEQ  NEXTCMD ; IF CR THEN GET ANOTHER CHAR.
241 
        TFR  A,B     ; PUT CHAR. IN "B" ACCUM.
242 
        CMPA #$20    ; IS IT CONTROL OR DATA CHAR ?
243 
        BGE  PRTCMD  ; IF CMD CHAR IS DATA, PRNT IT
244 
        LDA  #'^     ; ELSE CNTRL CHAR CMD SO...
245 
        LBSR OUTCH   ; PRINT "^"
246 
        TFR  B,A     ; RECALL CNTRL CMD CHAR
247 
        ADDA #$40    ; CONVERT IT TO ASCII LETTER
248 
PRTCMD  LBSR OUTCH   ; PRNT CMD CHAR
249 
        LBSR OUT1S   ; PRNT SPACE
250 
        CMPB #$60
251 
        BLE  NXTCH0
252 
        SUBB #$20
253 
*
254 
***** DO TABLE LOOKUP *****
255 
*   FOR COMMAND FUNCTIONS
256 
*
257 
NXTCH0  LDX  #JMPTAB ; POINT TO JUMP TABLE
258 
NXTCHR  CMPB ,X+     ; DOES COMMAND MATCH TABLE ENTRY ?
259 
        BEQ  JMPCMD  ; BRANCH IF MATCH FOUND
260 
        LEAX 2,X     ; POINT TO NEXT ENTRY IN TABLE
261 
        CMPX #TABEND ; REACHED END OF TABLE YET ?
262 
        BNE  NXTCHR  ; IF NOT END, CHECK NEXT ENTRY
263 
        LDX  #MSG4   ; POINT TO MSG "WHAT?"
264 
        LBSR PDATA   ; PRINT MSG
265 
        BRA  NEXTCMD ; IF NO MATCH, PRMPT FOR NEW CMD
266 
JMPCMD  JSR  [,X]    ; JUMP TO COMMAND ROUTINE
267 
        BRA  NEXTCMD ; PROMPT FOR NEW COMMAND
268 
*
269 
* "G" GO OR CONTINUE
270 
*
271 
GO      TFR  U,S
272 
RTI     RTI
273 
*
274 
***** "M" MEMORY EXAMINE AND CHANGE *****
275 
*
276 
MEMCHG  LBSR IN1ADR  ; INPUT ADDRESS
277 
        BVS  CHRTN   ; IF NOT HEX, RETURN
278 
        TFR  X,Y     ; SAVE ADDR IN "Y"
279 
MEMC2   LDX  #MSG5   ; POINT TO MSG " - "
280 
        LBSR PSTRNG  ; PRINT MSG
281 
        TFR  Y,X     ; FETCH ADDRESS
282 
        LBSR OUT4H   ; PRINT ADDR IN HEX
283 
        LBSR OUT1S   ; OUTPUT SPACE
284 
        LDA  ,Y      ; GET CONTENTS OF CURRENT ADDR.
285 
        LBSR OUT2H   ; OUTPUT CONTENTS IN ASCII
286 
        LBSR OUT1S   ; OUTPUT SPACE
287 
        LBSR BYTE    ; LOOP WAITING FOR OPERATOR INPUT
288 
        BVC  CHANGE  ; IF VALID HEX GO CHANGE MEM. LOC.
289 
        CMPA #8      ; IS IT A BACKSPACE (CNTRL H)?
290 
        BEQ  MEMC2   ; PROMPT OPERATOR AGAIN
291 
        CMPA #$18    ; IS IT A CANCEL (CNTRL X)?
292 
        BEQ  MEMC2   ; PROMPT OPERATOR AGAIN
293 
        CMPA #'^     ; IS IT AN UP ARROW?
294 
        BEQ  BACK    ; DISPLAY PREVIOUS BYTE
295 
        CMPA #$D     ; IS IT A CR?
296 
        BNE  FORWRD  ; DISPLAY NEXT BYTE
297 
CHRTN   RTS          ; EXIT ROUTINE
298 
*
299 
*
300 
CHANGE  STA  ,Y      ; CHANGE BYTE IN MEMORY
301 
        CMPA ,Y      ; DID MEMORY BYTE CHANGE?
302 
        BEQ  FORWRD  ; $F972
303 
        LBSR OUT1S   ; OUTPUT SPACE
304 
        LDA  #'?     ; LOAD QUESTION MARK
305 
        LBSR OUTCH   ; PRINT IT
306 
FORWRD  LEAY 1,Y     ; POINT TO NEXT HIGHER MEM LOCATION
307 
        BRA  MEMC2   ; PRINT LOCATION & CONTENTS
308 
BACK    LEAY -1,Y    ; POINT TO LAST MEM LOCATION
309 
        BRA  MEMC2   ; PRINT LOCATION & CONTENTS
310 
*
311 
* "S" DISPLAY STACK
312 
* HEX-ASCII DISPLAY OF CURRENT STACK CONTENTS FROM
313 
** CURRENT STACK POINTER TO INTERNAL STACK LIMIT.
314 
*
315 
DISSTK  LBSR PRTSP   ; PRINT CURRENT STACK POINTER
316 
        TFR  U,Y
317 
        LDX  #STACK  ; LOAD INTERNAL STACK AS UPPER LIMIT
318 
        LEAX -1,X    ; POINT TO CURRENT STACK
319 
        BRA  MDUMP1  ; ENTER MEMORY DUMP OF STACK CONTENTS
320 
*
321 
* "E" DUMP MEMORY FOR EXAMINE IN HEX AND ASCII
322 
* AFTER CALLING 'IN2ADR' LOWER ADDRESS IN Y-REG.
323 
*                        UPPER ADDRESS IN X-REG.
324 
* IF HEX ADDRESSES ARE INVALID (V)=1.
325 
*
326 
MEMDUMP LBSR IN2ADR  ; INPUT ADDRESS BOUNDRIES
327 
        BVS  EDPRTN  ; NEW COMMAND IF ILLEGAL HEX
328 
MDUMP1  PSHS Y       ; COMPARE LOWER TO UPPER BOUNDS
329 
        CMPX ,S++    ; LOWER BOUNDS > UPPER BOUNDS?
330 
        BCC  AJDUMP  ; IF NOT, DUMP HEX AND ASCII
331 
EDPRTN  RTS          ;
332 
*
333 
* ADJUST LOWER AND UPPER ADDRESS LIMITS
334 
* TO EVEN 16 BYTE BOUNDRIES.
335 
*
336 
* IF LOWER ADDR = $4532
337 
* LOWER BOUNDS WILL BE ADJUSTED TO = $4530.
338 
*
339 
* IF UPPER ADDR = $4567
340 
* UPPER BOUNDS WILL BE ADJUSTED TO = $4570.
341 
*
342 
* ENTER WITH LOWER ADDRESS IN X-REG.
343 
*           -UPPER ADDRESS ON TOP OF STACK.
344 
*
345 
AJDUMP  TFR  X,D     ; GET UPPER ADDR IN D-REG
346 
        ADDD #$10    ; ADD 16 TO UPPER ADDRESS
347 
        ANDB #$F0    ; MASK TO EVEN 16 BYTE BOUNDRY
348 
        PSHS A,B     ; SAVE ON STACK AS UPPER DUMP LIMIT
349 
        TFR  Y,D     ; $F9A5 GET LOWER ADDRESS IN D-REG
350 
        ANDB #$F0    ; MASK TO EVEN 16 BYTE BOUNDRY
351 
        TFR  D,X     ; PUT IN X-REG AS LOWER DUMP LIMIT
352 
NXTLIN  CMPX ,S      ; COMPARE LOWER TO UPPER LIMIT
353 
        BEQ  SKPDMP  ; IF EQUAL SKIP HEX-ASCII DUMP
354 
        LBSR INCHEK  ; CHECK FOR INPUT FROM KEYBOARD
355 59 davidgb 
        BEQ  EDUMP
356 99 davidgb 
SKPDMP  LEAS 2,S     ; READJUST STACK IF NOT DUMPING
357 59 davidgb 
        RTS          ;
358 99 davidgb 
*
359 
* PRINT 16 HEX BYTES FOLLOWED BY 16 ASCII CHARACTERS
360 
* FOR EACH LINE THROUGHOUT ADDRESS LIMITS.
361 
*
362 
EDUMP   PSHS X       ; PUSH LOWER ADDR LIMIT ON STACK
363 
        LDX  #MSG5   ; POINT TO MSG " - "
364 
        LBSR PSTRNG  ; PRINT MSG
365 
        LDX  ,S      ; LOAD LOWER ADDR FROM TOP OF STACK
366 
        LBSR OUT4H   ; PRINT THE ADDRESS
367 
        LBSR OUT2S   ; 2 SPACES
368 
        LDB  #$10    ; LOAD COUNT OF 16 BYTES TO DUMP
369 
ELOOP   LDA  ,X+     ; GET FROM MEMORY HEX BYTE TO PRINT
370 
        LBSR OUT2H   ; OUTPUT HEX BYTE AS ASCII
371 
        LBSR OUT1S   ; OUTPUT SPACE
372 
        DECB         ; $F9D1 DECREMENT BYTE COUNT
373 
        BNE  ELOOP   ; CONTINUE TIL 16 HEX BYTES PRINTED
374 
*
375 
* PRINT 16 ASCII CHARACTERS
376 
* IF NOT PRINTABLE OR NOT VALID
377 
* ASCII PRINT A PERIOD (.)
378 
        LBSR OUT2S   ; 2 SPACES
379 
        LDX  ,S++    ; GET LOW LIMIT FRM STACK - ADJ STACK
380 
        LDB  #$10    ; SET ASCII CHAR TO PRINT = 16
381 
EDPASC  LDA  ,X+     ; GET CHARACTER FROM MEMORY
382 
        CMPA #$20    ; IF LESS THAN $20, NON-PRINTABLE?
383 
        BCS  PERIOD  ; IF SO, PRINT PERIOD INSTEAD
384 
        CMPA #$7E    ; IS IT VALID ASCII?
385 
        BLS  PRASC   ; IF SO PRINT IT
386 
PERIOD  LDA  #'.     ; LOAD A PERIOD (.)
387 
PRASC   LBSR OUTCH   ; PRINT ASCII CHARACTER
388 
        DECB         ; DECREMENT COUNT
389 
        BNE  EDPASC
390 
        BRA  NXTLIN
391 
*
392 
***** "B" SET BREAKPOINT *****
393 
*
394 
BRKPNT  LBSR IN1ADR  ; GET BREAKPOINT ADDRESS
395 
        BVS  EXITBP  ; EXIT IF INVALID HEX ADDR.
396 
        CMPX #STACK  ; ADDRESS ILLEGAL IF >=$DFC0
397 
        BCC  BPERR   ; IF ERROR PRINT (?), EXIT
398 
        PSHS X       ; $FA82 PUSH BP ADDRESS ON STACK
399 
        LDX  #$FFFF  ; LOAD DUMMY ADDR TO TEST BP TABLE
400 
        BSR BPTEST   ; TEST BP TABLE FOR FREE SPACE
401 
        PULS X       ; POP BP ADDRESS FROM STACK
402 
        BEQ  BPERR   ; (Z) SET, OUT OF BP TABLE SPACE
403 
        LDA  ,X      ; GET DATA AT BREAKPOINT ADDRESS
404 
        CMPA #$3F    ; IS IT A SWI?
405 
        BEQ  BPERR   ; IF SWI ALREADY, INDICATE ERROR
406 
        STA  ,Y+     ; SAVE DATA BYTE IN BP TABLE
407 
        STX  ,Y      ; SAVE BP ADDRESS IN BP TABLE
408 
        LDA  #$3F    ; LOAD A SWI ($3F)
409 
        STA  ,X      ; SAVE SWI AT BREAKPOINT ADDRESS
410 59 davidgb 
EXITBP  RTS ;
411 
*
412 99 davidgb 
*  INDICATE ERROR SETTING BREAKPOINT
413 
*
414 
BPERR   LBSR OUT1S   ; OUTPUT SPACE
415 
        LDA  #'?     ; LOAD (?), INDICATE BREAKPOINT ERROR
416 
        LBRA OUTCH   ; PRINT "?"
417 
*
418 
*** "X" CLEAR OUTSTANDING BREAKPOINTS ***
419 
*
420 
XBKPNT  LDY  #BPTBL  ; POINT TO BREAKPOINT TABLE
421 
        LDB  #8      ; LOAD BREAKPOINT COUNTER
422 
XBPLP   BSR  RPLSWI  ; REMOVE USED ENTRY IN BP TABLE
423 
        DECB  $FAAC  ; DECREMENT BP COUNTER
424 
        BNE  XBPLP   ; END OF BREAKPOINT TABLE?
425 
        RTS
426 
*
427 
***** SWI ENTRY POINT *****
428 
*
429 
SWIE    TFR  S,U     ; TRANSFER STACK TO USER POINTER
430 
        LDX  10,U    ; LOAD PC FROM STACK INTO X-REG
431 
        LEAX -1,X    ; ADJUST ADDR DOWN 1 BYTE.
432 
        BSR  BPTEST  ; FIND BREAKPOINT IN BP TABLE
433 
        BEQ  REGPR   ; IF FOUND, REPLACE DATA AT BP ADDR
434 
        STX  10,U    ; SAVE BREAKPOINT ADDR IN STACK
435 
        BSR  RPLSWI  ; GO REPLACE SWI WITH ORIGINAL DATA
436 
REGPR   LBSR REGSTR  ; GO PRINT REGISTERS
437 
*
438 59 davidgb 
        IFD TRAOPT
439 
        LDX #0
440 
        STX TRACNT
441 
        ENDIF TRAOPT
442 
*
443 99 davidgb 
        LBRA NEXTCMD ; GET NEXT COMMAND
444 59 davidgb 
*
445 99 davidgb 
RPLSWI  LDX  1,Y     ; LOAD BP ADDRESS FROM BP TABLE
446 
        CMPX #STACK  ; COMPARE TO TOP AVAILABLE USER MEMORY
447 
        BCC  FFSTBL  ; GO RESET TABLE ENTRY TO $FF'S
448 
        LDA  ,X      ; GET DATA FROM BP ADDRESS
449 
        CMPA #$3F    ; IS IT SWI?
450 
        BNE  FFSTBL  ; IF NOT, RESET TABLE ENTRY TO $FF'S
451 
        LDA  ,Y      ; GET ORIGINAL DATA FROM BP TABLE
452 
        STA  ,X      ; $FAD3 RESTORE DATA AT BP ADDRESS
453 
FFSTBL  LDA  #$FF    ; LOAD $FF IN A-ACC
454 
        STA  ,Y+     ; RESET BREAKPOINT TABLE DATA TO $FF'S
455 
        STA  ,Y+     ; RESET BREAKPOINT TABLE ADDR TO $FF'S
456 
        STA  ,Y+
457 
        RTS
458 59 davidgb 
*
459 99 davidgb 
** SEARCH BREAKPOINT TABLE FOR MATCH **
460 
*
461 
BPTEST  LDY  #BPTBL  ; POINT TO BREAKPOINT TABLE
462 
        LDB  #8      ; LOAD BREAKPOINT COUNTER
463 
FNDBP   LDA  ,Y+     ; LOAD DATA BYTE
464 
        CMPX ,Y++    ; COMPARE ADDRESS, IS IT SAME?
465 
        BEQ  BPADJ   ; IF SO, ADJUST POINTER FOR TABLE ENTRY
466 
        DECB         ; IF NOT, DECREMENT BREAKPOINT COUNTER
467 
        BNE  FNDBP   ; AND LOOK FOR NEXT POSSIBLE MATCH
468 
        RTS          ;
469 
*
470 
*
471 
BPADJ   LEAY -3,Y    ; MOVE POINTER TO BEGIN OF BP ENTRY
472 
        RTS
473 
*
474 59 davidgb 
        IFD TRAOPT
475 
*
476 
** TRACE from address AAAA BB bytes
477 
*
478 99 davidgb 
TRACE   LBSR ALTPC1  ; SET UP NEW PC
479 
        BVS  TREXIT  ; ADDRESS ERROR, EXIT
480 59 davidgb 
        LBSR OUT1S
481 99 davidgb 
        LBSR IN1ADR  ; Fetch Byte Count
482 
        BVS TREXIT   ; Byte Count error, EXIT
483 59 davidgb 
        STX TRACNT
484 
*
485 99 davidgb 
        LDX NMI      ; Save NMI Vector
486 59 davidgb 
        STX NMISAV
487 99 davidgb 
        LDX #NMIE    ; Set up NMI for Tracing
488 59 davidgb 
        STX NMI
489 99 davidgb 
        LBSR TRAINZ  ; Initialise Hardware
490 
        BRA TRACEG   ; Start Trace
491 59 davidgb 
TREXIT  RTS
492 
*
493 
* CRA0 = 0 CA1 IRQ DISAB, CRA0 = 1 CA1 IRQ ENAB
494 
* CRA1 = 1 CA1 Rising edge IRQ
495 
* CRA2 = 0 TADATA = Data Direction, CRA2 = 1 TADATA = I/O Register
496 
* CRA3 = 0 CA2 = 0 output, CRA3 = 1 CA2 = 1
497 
* CRA4 = 1 ] CA2 = Set/Reset output
498 
* CRA5 = 1 ]
499 
* CRA6 = X CA2 Input Interrupt Flag
500 
* CRA7 = X CA1 Interrupt Flag
501 
*
502 
* CRB0 = 0 CB1 IRQ DISAB, CRB0 = 1 CA1 IRQ ENAB
503 
* CRB1 = 1 CB1 Rising edge IRQ
504 
* CRB2 = 0 TBDATA = Data Direction, CRB2 = 1 TBDATA = I/O Register
505 
* CRB3 = 0 CB2 = 0 output, CRB3 = 1 CB2 = 1
506 
* CRB4 = 1 ] CB2 = Set/Reset output
507 
* CRB5 = 1 ]
508 
* CRB6 = X CB2 Input Interrupt Flag
509 
* CRB7 = X CB1 Interrupt Flag
510 
*
511 
*
512 
** TRACE NMI ENTRY POINT
513 
*
514 99 davidgb 
NMIE    TFR  S,U
515 
        LDA  #$36    ; Disable Interrupt, CA2 Low
516 
        STA  TACTRL
517 
        LDA  TADATA  ; Clear Interrupt flag by reading data port
518 59 davidgb 
*
519 99 davidgb 
        LBSR REGSTR  ; DUMP REGISTERS
520 59 davidgb 
*
521 99 davidgb 
        LDX  10,U    ; TEST IF NEXT INSTRUCTION IS A SWI
522 
        LDA  ,X
523 59 davidgb 
        CMPA #$3F
524 99 davidgb 
        BEQ  TRACEX  ; EXIT ON SWI
525 59 davidgb 
*
526 99 davidgb 
        LDX  TRACNT  ; CHECK IF TRACE COUNT EXPIRED
527 
        BEQ  TRACEX  ; YES, GO BACK TO THE MONITOR
528 
        LEAX -1,X    ; ECREMENT TRACE COUNT
529 
        STX  TRACNT
530 59 davidgb 
*
531 
**  TRACE GO (RESUME SINGLE STEP)
532 
*
533 99 davidgb 
TRACEG  TFR  U,S     ; SET UP PROGRAM STACK POINTER
534 
        LDA  #TRADEL ; SET UP TIMER DELAY (NUMB CYCLES FOR RTI+1)
535 
        STA  TADATA
536 
        LDA  #$36    ; LOAD STROBE LOW
537 
        STA  TACTRL
538 
        LDA  TADATA  ; CLEAR INTERRUPT
539 
        LDA  #$36    ; RELEASE RESET
540 
        STA  TBCTRL
541 
        LDA  #$3F    ; RELEASE LOAD, ENABLE CA1 NMI, CA1 RISING EDGE
542 
        STA  TACTRL
543 
        RTI          ; GO EXECUTE INSTRUCTION
544 59 davidgb 
*
545 99 davidgb 
TRACEX  LDX NMISAV   ; Restore NMI vector
546 59 davidgb 
        STX NMI
547 99 davidgb 
        LBRA NEXTCMD ; Jump back to the command loop.
548 59 davidgb 
*
549 
** TRACE HARDWARE INITIALISATION
550 
*
551 99 davidgb 
TRAINZ  LDA #$32     ; SELECT DDRA, CA2 LOW, NMI DISABLED
552 59 davidgb 
        STA TACTRL
553 99 davidgb 
        LDA #$3A     ; SELECT DDRB, CB2 HIGH, FIRQ DISABLED
554 59 davidgb 
        STA TBCTRL
555 99 davidgb 
        LDA #$FF     ; PORTA = OUTPUT
556 59 davidgb 
        STA TADATA
557 99 davidgb 
        LDA #$00     ; PORTB = INPUT
558 59 davidgb 
        STA TBDATA
559 99 davidgb 
        LDA #$36     ; SELECT OUTPUT REGISTER A, CA2 LOW
560 59 davidgb 
        STA TACTRL
561 99 davidgb 
        LDA #$3E     ; SELECT OUTPUT REGISTER B, CB2 HIGH
562 59 davidgb 
        STA TBCTRL
563 
        RTS
564 
*
565 
        ENDIF TRAOPT
566 
        IFD  MFDCOPT
567 
*
568 
** "U" MINI DISK BOOT
569 
*
570 
MINBOOT TST  CMDFDC
571 
        CLR  DRVFDC
572 
        LDX  #$0000
573 
LOOP    LEAX $01,X
574 
        CMPX #$0000
575 
        BNE  LOOP
576 
        LDA  #$0F
577 
        STA  CMDFDC
578 
        BSR  DELAY
579 
LOOP1   LDB  CMDFDC
580 
        BITB #$01
581 
        BNE  LOOP1
582 
        LDA  #$01
583 
        STA  SECFDC
584 
        BSR  DELAY
585 
        LDA  #$8C
586 
        STA  CMDFDC
587 
        BSR  DELAY
588 
        LDX  #$C000
589 
        BRA  LOOP3
590 
LOOP2   BITB #$02
591 
        BEQ  LOOP3
592 
        LDA  DATFDC
593 
        STA ,X+
594 
LOOP3   LDB  CMDFDC
595 
        BITB #$01
596 
        BNE  LOOP2
597 
        BITB #$2C
598 
        BEQ  LOOP4
599 
        RTS
600 
*
601 
LOOP4   LDX  #$C000
602 
        STX  $0A,U
603 
        TFR  U,S
604 99 davidgb 
        RTI
605 59 davidgb 
*
606 
DELAY   LDB  #$04
607 
LOOP5   DECB
608 
        BNE  LOOP5
609 
        RTS
610 
        ENDIF MFDCOPT
611 99 davidgb 
*
612 59 davidgb 
        IFD  DMAFOPT
613 99 davidgb 
*
614 
*** "D" DISK BOOT FOR DMAF2 ***
615 
*
616 
DBOOT   LDA  #$DE
617 
        STA  DRVREG
618 
        LDA  #$FF
619 
        STA  PRIREG  ; $FAF8
620 
        STA  CCREG
621 
        STA  AAAREG
622 
        STA  BBBREG
623 
        TST  CCREG
624 
        LDA  #$D8
625 
        STA  COMREG
626 
        LBSR DLY
627 
DBOOT0  LDA  COMREG
628 
        BMI  DBOOT0
629 
        LDA  #$09
630 
        STA  COMREG
631 
        LBSR DLY
632 
*
633 
DISKWT  LDA  COMREG  ; FETCH DRIVE STATUS
634 
        BITA #1      ; TEST BUSY BIT
635 
        BNE  DISKWT  ; LOOP UNTIL NOT BUSY
636 
*
637 
        BITA #$10
638 
        BNE  DBOOT
639 
*
640 
        LDX  #$C000  ; LOGICAL ADDR. = $C000
641 
        BSR LRA      ; GET 20 BIT PHYSICAL ADDR. OF LOG. ADDR.
642 
        ORA  #$10
643 
        STA  CCCREG
644 
        TFR  X,D
645 
        COMA  ;
646 
        COMB  ;
647 
        STD  ADDREG
648 
        LDX  #$FEFF  ; LOAD DMA BYTE COUNT = $100
649 
        STX  CNTREG  ; STORE IN COUNT REGISTER
650 
        LDA  #$FF    ; LOAD THE CHANNEL REGISTER
651 
        STA  CCREG
652 
        LDA  #$FE    ; SET CHANNEL 0
653 
        STA  PRIREG
654 
        LDA  #1      ; SET SECTOR TO "1"
655 
        STA  SECREG  ; ISSUE COMMAND
656 
        LDA  #$8C    ; SET SINGLE SECTOR READ
657 
        STA  COMREG  ; ISSUE COMMAND
658 
        BSR  DLY
659 
*
660 
* THE FOLLOWING CODE TESTS THE STATUS OF THE
661 
* CHANNEL CONTROL REGISTER. IF "D7" IS NOT
662 
* ZERO THEN IT WILL LOOP WAITING FOR "D7"
663 
* TO GO TO ZERO. IF AFTER 65,536 TRIES IT
664 
* IS STILL A ONE THE BOOT OPERATION WILL
665 
* BE STARTED OVER FROM THE BEGINING.
666 
*
667 
        CLRB         ;
668 
DBOOT1  PSHS B       ; $FB55
669 
        CLRB         ;
670 
DBOOT2  TST  CCREG
671 
        BPL  DBOOT3
672 
        DECB  ;
673 
        BNE  DBOOT2
674 
        PULS B
675 
        DECB
676 
        BNE  DBOOT1
677 
        BRA  DBOOT
678 
DBOOT3  PULS B
679 
        LDA  COMREG
680 
        BITA #$1C
681 
        BEQ  DBOOT4
682 
        RTS  ;
683 
*
684 
*
685 
DBOOT4  LDB  #$DE
686 
        STB  DRVREG
687 
        LDX  #$C000
688 
        STX  10,U
689 
        TFR  U,S     ; $FB7B
690 
        RTI  ;
691 59 davidgb 
        ENDIF DMAFOPT
692 
*
693 
        IFD CF8OPT
694 
*
695 
* COMPACT FLASH BOOT
696 
*
697 
CFBOOT  BSR  WAITRDY
698 
        LDA  #HEADLBA
699 
        STA  CF_HEAD
700 
        BSR  WAITRDY
701 
        LDA  #FEAT8BIT
702 
        STA  CF_FEATURE
703 
        LDA  #CMDFEATURE
704 
        STA  CF_COMAND
705 
        BSR  WAITRDY
706 
*
707 
* READ SECTORS FROM CF
708 
*
709 
CFREAD  LDA  #$01
710 
        STA  CF_SECCNT
711 
        CLRA
712 
        STA  CF_SECNUM
713 
        STA  CF_CYLLO
714 
        STA  CF_CYLHI
715 
*
716 
        LDA  #CMDREAD ; IDE READ MULTIPLE
717 
        STA  CF_COMAND
718 
        BSR  WAITRDY
719 
        LDX  #$C000
720 
*
721 
* READ LOOP
722 
*
723 
RDLOOP  BSR  WAITDRQ
724 
        LDA  CF_DATA
725 
        STA  ,X+
726 
        CMPX #$C200
727 
        BNE  RDLOOP
728 
*
729 
        LDX  #$C000
730 
        STX  $0A,U
731 
        TFR  U,S
732 99 davidgb 
        RTI
733 59 davidgb 
*
734 
* WAIT UNTIL READY
735 
*
736 
WAITRDY LDA  CF_STATUS
737 
        BITA #BUSY
738 
        BNE  WAITRDY
739 
        LDA  CF_STATUS
740 
        BITA #DRDY
741 
        BEQ  WAITRDY
742 
        RTS
743 
*
744 
* WAIT FOR DATA REQUEST
745 
*
746 
WAITDRQ LDA  CF_STATUS
747 
        BITA #DRQ
748 
        BEQ  WAITDRQ
749 
        RTS
750 
        ENDIF CF8OPT
751 
*
752 
        IFD IDEOPT
753 
*
754 
* XESS 16 BIT IDE BOOT
755 
*
756 
IDEBOOT LDD  #AUXRESET
757 
        STD  CF_AUX
758 
        LDD #AUXRSTREL
759 
        STD CF_AUX
760 
        LDD  #HEADLBA
761 
        STD  CF_HEAD
762 
        BSR  WAITRDY
763 
*
764 
* READ SECTORS FROM CF
765 
*
766 
        LDD  #$01
767 
        STD  CF_SECCNT
768 
        CLRB
769 
        STD  CF_SECNUM
770 
        STD  CF_CYLLO
771 
        STD  CF_CYLHI
772 
*
773 
        LDB  #CMDREAD ; IDE READ MULTIPLE
774 
        STD  CF_COMAND
775 
        BSR  WAITRDY
776 
        LDX  #$C000
777 
*
778 
* READ LOOP
779 
*
780 
RDLOOP  BSR  WAITDRQ
781 
        LDD  CF_DATA
782 
        STB  ,X+
783 
        CMPX #$C100
784 
        BNE  RDLOOP
785 
*
786 
        LDX  #$C000
787 
        STX  $0A,U
788 
        TFR  U,S
789 99 davidgb 
        RTI
790 59 davidgb 
*
791 
* WAIT UNTIL READY
792 
*
793 
WAITRDY LDD  CF_STATUS
794 
        BITB #BUSY
795 
        BNE  WAITRDY
796 
        LDD  CF_STATUS
797 
        BITB #DRDY
798 
        BEQ  WAITRDY
799 
        RTS
800 
*
801 
* WAIT FOR DATA REQUEST
802 
*
803 
WAITDRQ LDD  CF_STATUS
804 
        BITB #DRQ
805 
        BEQ  WAITDRQ
806 
        RTS
807 
        ENDIF IDEOPT
808 
*
809 
        IFD RTCOPT
810 
*
811 
* CLOCK INTER FACE UTILITY
812 
*
813 
* TIME
814 
* If no argument is specified, the current time
815 
* will be displayed.
816 
*
817 
* READ A REGISTER FROM THE COUNTER.
818 
* The X Index rgister points to the register
819 
* to be read. The Status Register is checked
820 
* before and after the register is read before
821 
* returning a value in accumulator A
822 
*
823 
RDCLK  TST CLKSTA
824 
       BNE RDCLK
825 
RDCLK1 LDA 0,X
826 
       TST CLKSTA
827 
       BNE RDCLK1
828 
       RTS
829 
*
830 
* MAIN PROGRAM:
831 
*
832 99 davidgb 
TIMSET LDX #COUNTR    ; POINT TO TIMER
833 
      LBSR BYTE       ; READ HOURS
834 
      BVS  SHOWTM     ; NO ARG, DISP TIME
835 59 davidgb 
      STA HOUR,X
836 
      LBSR OUT1S
837 99 davidgb 
      LBSR BYTE       ; READ MINUITES
838 59 davidgb 
      BVS  SHOWTM
839 
      STA MINUIT,X
840 
      LBSR OUT1S
841 99 davidgb 
      LBSR BYTE       ; SECONDS.
842 59 davidgb 
      BVS SHOWTM
843 
      STA SECOND,X
844 
*
845 
* DISPLAY CURRENT TIME
846 
*
847 
SHOWTM LBSR PCRLF
848 
       LDX #COUNTR+HOUR
849 
       LDB #3
850 
SHOWLP BSR RDCLK
851 
       LBSR OUT2H
852 
       LDA #':
853 
       LBSR OUTCH
854 
       LEAX -1,X
855 
       DECB
856 
       BNE SHOWLP
857 
       RTS
858 
*
859 
* INITIATE CLOCK.
860 
* MASK INTERRUPTS.
861 
*
862 99 davidgb 
CLKINZ CLR CINTCR     ; MASK ALL INTERRUPTS
863 
       TST CINTSR     ; CLEAR ANY INTERRUPTS
864 59 davidgb 
       RTS
865 
       ENDIF RTCOPT
866 
       IFD DATOPT
867 
*
868 99 davidgb 
***** LRA LOAD REAL ADDRESS *****
869 
*
870 
* THE FOLLOWING CODE LOADS THE 20-BIT
871 
* PHYSICAL ADDRESS OF A MEMORY BYTE
872 
* INTO THE "A" AND "X" REGISTERS. THIS
873 
* ROUTINE IS ENTERED WITH THE LOGICAL
874 
* ADDRESS OF A MEMORY BYTE IN THE "IX"
875 
* REGISTER. EXIT IS MADE WITH THE HIGH-
876 
* ORDER FOUR BITS OF THE 20-BIT PHYSICAL
877 
* ADDRESS IN THE "A" REGISTER, AND THE
878 
* LOW-ORDER 16-BITS OF THE 20-BIT
879 
* PHYSICAL ADDRESS IN THE "IX" REGISTER.
880 
* ALL OTHER REGISTERS ARE PRESERVED.
881 
* THIS ROUTINE IS REQUIRED SINCE THE
882 
* DMAF1 AND DMAF2 DISK CONTROLLERS MUST
883 
* PRESENT PHYSICAL ADDRESSES ON THE
884 
* SYSTEM BUS.
885 
*
886 
LRA     PSHS A,B,X,Y  ; PUSH REGISTERS ON STACK
887 
        LDA  2,S      ; GET MSB LOGICAL ADDR FRM X REG ON STACK
888 
        LSRA          ;
889 
        LSRA          ; ADJ FOR INDEXED INTO
890 
        LSRA          ; CORRESPONDING LOCATION
891 
        LSRA          ; IN LRA TABLE
892 
        LDY  #LRARAM  ; LOAD LRA TABLE BASE ADDRESS
893 
        LDB  A,Y      ; GET PHYSICAL ADDR. DATA FROM LRA TABLE
894 
        LSRB          ; ADJ. REAL ADDR. TO REFLECT EXTENDED
895 
        LSRB          ; PHYSICAL ADDRESS.
896 
        LSRB          ; EXTENDED MS 4-BITS ARE RETURNED
897 
        LSRB          ; IN THE "A" ACCUMULATOR
898 
        STB  ,S       ; MS 4 BITS IN A ACCUM. STORED ON STACK
899 
        LDB  A,Y      ; LOAD REAL ADDRESS DATA FROM LRA TABLE
900 
        COMB          ; COMP TO ADJ FOR PHYSICAL ADDR. IN X REG
901 
        ASLB          ; ADJ DATA FOR RELOCATION IN X REG
902 
        ASLB          ;
903 
        ASLB          ; $FB97
904 
        ASLB          ;
905 
        LDA  2,S      ; GET MS BYTE OF LOGICAL ADDR.
906 
        ANDA #$0F     ; MASK MS NIBBLE OF LOGICAL ADDRESS
907 
        STA  2,S      ; SAVE IT IN X REG ON STACK
908 
        ORB  2,S      ; SET MS BYTE IN X REG TO ADJ PHY ADDR.
909 
*
910 
* PLUS LS NIBBLE OF LOGICAL ADDRESS
911 
*
912 
        STB  2,S      ; SAVE AS LS 16 BITS OF PHY ADDR IN X REG ON STACK
913 
        PULS A,B,X,Y,PC ; POP REGS. FROM STACK
914 59 davidgb 
        ENDIF DATOPT
915 99 davidgb 
*
916 
* DELAY LOOP
917 
*
918 
DLY     PSHS B        ; SAVE CONTENTS OF "B"
919 
        LDB  #$20     ; GET LOOP DELAY VALUE
920 
SUB1    DECB          ; SUBTRACT ONE FROM VALUE
921 
        BNE  SUB1     ; LOOP UNTIL ZERO
922 
        PULS B,PC     ; RESTORE CONTENTS OF "B"
923 59 davidgb 
* RTS  ;
924 99 davidgb 
*
925 
***** "L" LOAD MIKBUG TAPE *****
926 
*
927 59 davidgb 
LOAD    JSR  ACINIZ
928 99 davidgb 
        LDA  #$11     ; LOAD 'DC1' CASS. READ ON CODE
929 
        LBSR OUTCH    ; OUTPUT IT TO TERMINAL PORT
930 
        CLR  ECHO     ; TURN OFF ECHO FLAG
931 
LOAD1   LBSR ECHON    ; INPUT 8 BIT BYTE WITH NO ECHO
932 
LOAD2   CMPA #'S      ; IS IT AN "S", START CHARACTER ?
933 
        BNE  LOAD1    ; IF NOT, DISCARD AND GET NEXT CHAR.
934 
        LBSR ECHON
935 
        CMPA #'9      ; IS IT A "9" , END OF FILE CHAR ?
936 
        BEQ  LOAD21   ; IF SO, EXIT LOAD
937 
        CMPA #'1      ; IS IT A "1" , FILE LOAD CHAR ?
938 
        BNE  LOAD2    ; IF NOT, LOOK FOR START CHAR.
939 
        LBSR BYTE     ; INPUT BYTE COUNT
940 
        PSHS A        ; PUSH COUNT ON STACK
941 
        BVS  LODERR   ; (V) C-CODE SET, ILLEGAL HEX
942 
        LBSR IN1ADR   ; INPUT LOAD ADDRESS
943 
        BVS  LODERR   ; (V) C-CODE SET, ADDR NOT HEX
944 
        PSHS X        ; PUSH ADDR ON STACK
945 
        LDB  ,S+      ; LOAD MSB OF ADDR AS CHECKSUM BYTE
946 
        ADDB ,S+      ; ADD LSB OF ADDR TO CHECKSUM
947 
        ADDB ,S       ; ADD BYTE COUNT BYTE TO CHECKSUM
948 
        DEC  ,S       ; $FC37 DECREMENT BYTE COUNT 2 TO BYPASS
949 
        DEC  ,S       ; ADDRESS BYTES.
950 
LOAD10  PSHS B        ; PUSH CHECKSUM ON STACK
951 
        LBSR BYTE     ; INPUT DATA BYTE (2 HEX CHAR)
952 
        PULS B        ; POP CHECKSUM FROM STACK
953 
        BVS  LODERR   ; (V) SET, DATA BYTE NOT HEX
954 
        PSHS A        ; PUSH DATA BYTE ON STACK
955 
        ADDB ,S+      ; ADD DATA TO CHECKSUM, AUTO INC STACK
956 
        DEC  ,S       ; DECREMENT BYTE COUNT 1
957 
        BEQ  LOAD16   ; IF BYTE COUNT ZERO, TEST CHECKSUM
958 
        STA  ,X+      ; SAVE DATA BYTE IN MEMORY
959 
        BRA  LOAD10   ; GET NEXT DATA BYTE
960 
LODERR  CLRB          ; ERROR CONDITION, ZERO CHECKSUM  ;
961 
LOAD16  PULS A        ; ADJUST STACK (REMOVE BYTE COUNT)
962 
        CMPB #$FF     ; CHECKSUM OK?
963 
        BEQ  LOAD1    ; IF SO, LOAD NEXT LINE
964 
        LDA  #'?      ; LOAD (?) ERROR INDICATOR
965 
        LBSR OUTCH    ; OUTPUT IT TO TERMINAL
966 
LOAD21  COM  ECHO     ; TURN ECHO ON
967 
        LDA  #$13     ; $FC5F LOAD 'DC3' CASS. READ OFF CODE
968 
        LBRA OUTCH    ; OUTPUT IT
969 
*
970 
***** "P" PUNCH MIKBUG TAPE *****
971 
*
972 
PUNCH   CLR  ,-S      ; CLEAR RESERVED BYTE ON STACK
973 
        LBSR IN2ADR   ; GET BEGIN AND END ADDRESS
974 
        PSHS X,Y      ; SAVE ADDRESSES ON STACK
975 
        BVS  PUNEXT   ; (V) C-CODE SET, EXIT PUNCH
976 
        CMPX 2,S      ; COMPARE BEGIN TO END ADDR
977 
        BCS  PUNEXT   ; IF BEGIN GREATER THAN END, EXIT PUNCH
978 
        LEAX 1,X      ; INCREMENT END ADDRESS
979 
        STX  ,S       ; STORE END ADDR ON STACK
980 59 davidgb 
        JSR  ACINIZ
981 99 davidgb 
        LDA  #$12     ; LOAD 'DC2' PUNCH ON CODE
982 
        LBSR OUTCH    ; OUTPUT IT TO TERMINAL
983 
PUNCH2  LDD  ,S       ; LOAD END ADDR IN D-ACC
984 
        SUBD 2,S      ; SUBTRACT BEGIN FROM END
985 
        BEQ  PUNCH3   ; SAME, PUNCH 32 BYTES DEFAULT
986 
        CMPD #$20     ; LESS THAN 32 BYTES?
987 
        BLS  PUNCH4   ; PUNCH THAT MANY BYTES
988 
PUNCH3  LDB  #$20     ; LOAD BYTE COUNT OF 32.
989 
PUNCH4  STB  4,S      ; STORE ON STACK AS BYTE COUNT
990 
        LDX  #MSG20   ; POINT TO MSG "S1"
991 
        LBSR PSTRNG   ; PRINT MSG
992 
        ADDB #3       ; ADD 3 BYTES TO BYTE COUNT
993 
        TFR  B,A      ; GET BYTE COUNT IN A-ACC TO PUNCH
994 
        LBSR OUT2H    ; OUTPUT BYTE COUNT
995 
        LDX  2,S      ; LOAD BEGIN ADDRESS
996 
        LBSR OUT4H    ; PUNCH ADDRESS
997 
        ADDB 2,S      ; ADD ADDR MSB TO CHECKSUM
998 
        ADDB 3,S      ; ADD ADDR LSB TO CHECKSUM
999 
PUNCHL  ADDB ,X       ; ADD DATA BYTE TO CHECKSUM
1000 
        LDA  ,X+      ; LOAD DATA BYTE TO PUNCH
1001 
        LBSR OUT2H    ; OUTPUT DATA BYTE
1002 
        DEC  4,S      ; DECREMENT BYTE COUNT
1003 
        BNE  PUNCHL   ; NOT DONE, PUNCH NEXT BYTE
1004 
        COMB  1's     ; COMPLIMENT CHECKSUM BYTE
1005 
        TFR  B,A      ; GET IT IN A-ACC TO PUNCH
1006 
        LBSR OUT2H    ; OUTPUT CHECKSUM BYTE
1007 
        STX  2,S      ; SAVE X-REG IN STACK AS NEW PUNCH ADDR
1008 
        CMPX ,S       ; COMPARE IT TO END ADDR
1009 
        BNE  PUNCH2   ; $FCB5 PUNCH NOT DONE, CONT.
1010 
PUNEXT  LDA  #$14     ; LOAD 'DC4' PUNCH OFF CODE
1011 
        LBSR OUTCH    ; OUTPUT IT
1012 
        LEAS 5,S      ; READJUST STACK POINTER
1013 
        RTS  ;
1014 59 davidgb 
*
1015 99 davidgb 
* PRINT STRING PRECEEDED BY A CR & LF.
1016 
*
1017 
PSTRNG  BSR  PCRLF    ; PRINT CR/LF
1018 
        BRA  PDATA    ; PRINT STRING POINTED TO BY IX
1019 
*
1020 
* PCRLF
1021 
*
1022 
PCRLF   PSHS X        ; SAVE IX
1023 
        LDX  #MSG2+1  ; POINT TO MSG CR/LF + 3 NULS
1024 
        LBSR PDATA    ; PRINT MSG
1025 
        PULS X,PC     ; RESTORE IX & RETURN
1026 
*
1027 59 davidgb 
* LONG BRANCHES TO COMMON ROUTINES
1028 
*
1029 
JOUT1S  LBRA OUT1S
1030 
JBYTE   LBRA BYTE
1031 
JIN1ADR LBRA IN1ADR
1032 99 davidgb 
*
1033 
* ALTER "PC" PROGRAM COUNTER
1034 
*
1035 
ALTRPC  LBSR  PRTPC   ; $FCF5 PRINT MSG " PC = "
1036 
ALTPC1  BSR  JOUT1S   ; OUTPUT SPACE
1037 
        BSR  JIN1ADR  ; GET NEW CONTENTS FOR "PC"
1038 
        BVS  ALTPCD   ; EXIT IF INVALID HEX
1039 
        STX  10,U     ; POKE IN NEW CONTENTS
1040 
ALTPCD  RTS           ;
1041 
*
1042 
* ALTER "U" USER STACK POINTER
1043 
*
1044 
ALTRU   BSR  PRTUS    ; $FCCA PRINT MSG " US = "
1045 
        BSR  JOUT1S   ; OUTPUT SPACE
1046 
        BSR  JIN1ADR  ; GET NEW CONTENTS FOR "US"
1047 
        BVS  ALTUD    ; EXIT IF INVALID HEX
1048 
        STX  8,U      ; POKE IN NEW CONTENTS
1049 
ALTUD   RTS           ;
1050 
*
1051 
* ALTER "Y" INDEX REGISTER
1052 
*
1053 
ALTRY   BSR  PRTIY    ; PRINT MSG " IY = "
1054 
        BSR  JOUT1S   ; OUTPUT SPACE
1055 
        BSR  JIN1ADR  ; GET NEW CONTENTS FOR "IY"
1056 
        BVS  ALTYD    ; EXIT IF INVALID HEX
1057 
        STX  6,U      ; $F8F0 POKE IN NEW CONTENTS
1058 
ALTYD   RTS           ;
1059 
*
1060 
* ALTER "X" INDEX REGISTER
1061 
*
1062 
ALTRX   BSR  PRTIX    ; $FCE0 PRINT MSG " IX = "
1063 
        BSR  JOUT1S   ; OUTPUT SPACE
1064 
        BSR  JIN1ADR
1065 
        BVS  ALTXD
1066 
        STX  4,U
1067 59 davidgb 
ALTXD   RTS ;
1068 99 davidgb 
*
1069 
* ALTER "DP" DIRECT PAGE REGISTER
1070 
*
1071 
ALTRDP  BSR  PRTDP    ; $FCD5 PRINT MSG " DP = "
1072 
        BSR  JOUT1S   ; OUTPUT SPACE
1073 
        BSR  JBYTE    ; INPUT BYTE (2 HEX CHAR)
1074 
        BVS  ALTDPD
1075 
        STA  3,U
1076 59 davidgb 
ALTDPD  RTS ;
1077 99 davidgb 
*
1078 
* ALTER "B" ACCUMULATOR
1079 
*
1080 
ALTRB   BSR  PRTB     ; $FD09 PRINT MSG " B = "
1081 
        BSR  JOUT1S   ; OUTPUT SPACE
1082 
        BSR  JBYTE    ; INPUT BYTE (2 HEX CHAR)
1083 
        BVS  ALTBD
1084 
        STA  2,U
1085 
ALTBD   RTS           ; $F91C
1086 
*
1087 
* ALTER "A" ACCUMULATOR
1088 
*
1089 
ALTRA   BSR  PRTA     ; $FCFF RINT MSG " A = "
1090 
        BSR  JOUT1S   ; OUTPUT SPACE
1091 
        BSR  JBYTE    ; INPUT BYTE (2 HEX CHAR)
1092 
        BVS  ALTAD
1093 
        STA  1,U
1094 59 davidgb 
ALTAD   RTS ;
1095 99 davidgb 
*
1096 
* ALTER "CC" REGISTER
1097 
*
1098 
ALTRCC  BSR  PRTCC    ; $FD13 PRINT MSG " CC: "
1099 
        BSR  JOUT1S   ; OUTPUT SPACE
1100 
        BSR  JBYTE    ; INPUT BYTE (2 HEX CHAR)
1101 
        BVS  ALTCCD
1102 
        ORA  #$80     ; SETS "E" FLAG IN PRINT LIST
1103 
        STA  ,U
1104 59 davidgb 
ALTCCD  RTS ;
1105 
*
1106 99 davidgb 
* PDATA
1107 
*
1108 
PRINT   LBSR OUTCH
1109 
PDATA   LDA  ,X+      ; GET 1st CHAR. TO PRINT
1110 
        CMPA #4       ; IS IT EOT?
1111 
        BNE  PRINT    ; IF NOT EOT PRINT IT
1112 
        RTS  ;
1113 
*
1114 59 davidgb 
* PRINT REGISTERS
1115 
*
1116 99 davidgb 
PRTSP   LDX  #MSG10   ; POINT TO MSG "SP="
1117 
        BSR  PDATA    ; PRINT MSG
1118 
        TFR  U,X
1119 
JOUT4H  LBRA OUT4H
1120 59 davidgb 
*
1121 99 davidgb 
PRTUS   LDX  #MSG12   ; POINT TO MSG "US="
1122 
        BSR  PDATA    ; PRINT MSG
1123 
        LDX  8,U
1124 
        BRA  JOUT4H
1125 59 davidgb 
*
1126 99 davidgb 
PRTDP   LDX   #MSG15  ; POINT TO MSG "DP="
1127 
        BSR  PDATA    ; PRINT MSG
1128 
        LDA  3,U
1129 
JOUT2H  LBRA OUT2H    ; OUTPUT HEX BYTE AS ASCII
1130 59 davidgb 
*
1131 99 davidgb 
PRTIX   LDX  #MSG14   ; POINT TO MSG "IX="
1132 
        BSR  PDATA    ; PRINT MSG
1133 
        LDX  4,U      ; $FCE6
1134 
        BRA  JOUT4H
1135 59 davidgb 
*
1136 99 davidgb 
PRTIY   LDX  #MSG13   ; POINT TO MSG "IY="
1137 
        BSR  PDATA    ; PRINT MSG
1138 
        LDX  6,U
1139 
        BRA  JOUT4H
1140 59 davidgb 
*
1141 99 davidgb 
PRTPC   LDX  #MSG11   ; POINT TO MSG "PC="
1142 
        BSR  PDATA    ; PRINT MSG
1143 
        LDX  10,U
1144 
        BRA  JOUT4H
1145 59 davidgb 
*
1146 99 davidgb 
PRTA    LDX  #MSG16   ; POINT TO MSG "A="
1147 
        BSR  PDATA    ; PRINT MSG
1148 
        LDA  1,U
1149 
        BRA  JOUT2H   ; OUTPUT HEX BYTE AS ASCII
1150 59 davidgb 
*
1151 99 davidgb 
PRTB    LDX  #MSG17   ; POINT TO MSG "B="
1152 
        BSR  PDATA    ; PRINT MSG
1153 
        LDA  2,U
1154 
        BRA  JOUT2H   ; OUTPUT HEX BYTE AS ASCII
1155 59 davidgb 
*
1156 99 davidgb 
PRTCC   LDX  #MSG18   ; POINT TO MSG "CC:"
1157 
        BSR  PDATA    ; PRINT MSG
1158 
        LDA  ,U
1159 
        LDX  #MSG19   ; POINT TO MSG "EFHINZVC"
1160 
        LBRA BIASCI   ; OUTPUT IN BINARY/ASCII FORMAT
1161 59 davidgb 
*
1162 99 davidgb 
* "R" DISPLAY REGISTERS
1163 59 davidgb 
*
1164 99 davidgb 
REGSTR  LDX  #MSG5    ; POINT TO MSG " - "
1165 
        LBSR PSTRNG   ; PRINT MSG
1166 
        BSR  PRTSP    ; $FCBF
1167 
        BSR  PRTUS    ; $FCCA
1168 
        BSR  PRTDP    ; $FCD5
1169 
        BSR  PRTIX    ; $FCE0
1170 
        BSR  PRTIY    ; $FCEB
1171 
        LDX  #MSG5    ; POINT TO MSG " - "
1172 
        LBSR PSTRNG   ; PRINT MSG
1173 
        BSR  PRTPC    ; $FCF5
1174 
        BSR  PRTA     ; $FCFF
1175 
        BSR  PRTB     ; $FD09
1176 
        BRA  PRTCC    ; $FD13
1177 
*
1178 
* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE
1179 
* OPERATOR TO INPUT TWO VALID HEX ADDRESSES.
1180 
* THE FIRST ADDRESS INPUT IS RETURNED IN "IY".
1181 
* THE SECOND IS RETURNED IN "IX". THE "V" BIT
1182 
* IN THE C-CODE REG. IS SET IF AN INVALID HEX
1183 
* ADDRESS IS INPUT.
1184 
*
1185 
IN2ADR  BSR  IN1ADR   ; GET FIRST ADDRESS
1186 
        BVS  NOTHEX   ; EXIT IF NOT VALID HEX
1187 
        TFR  X,Y      ; SAVE FIRST ADDR. IN "IY"
1188 
        LDA  #'-
1189 
        LBSR OUTCH    ; PRINT " - "
1190 
*
1191 
* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE
1192 
* OPERATOR TO INPUT ONE VALID HEX ADDRESS. THE
1193 
* ADDRESS IS RETURNED IN THE "X" REGISTER.
1194 
*
1195 
IN1ADR  BSR  BYTE     ; INPUT BYTE (2 HEX CHAR)
1196 
        BVS  NOTHEX   ; EXIT IF NOT VALID HEX
1197 
        TFR  D,X
1198 
        BSR  BYTE     ; INPUT BYTE (2 HEX CHAR)
1199 
        BVS  NOTHEX
1200 
        PSHS X
1201 
        STA  1,S
1202 
        PULS X,PC
1203 
*
1204 
***** INPUT BYTE (2 HEX CHAR.) *****
1205 
*
1206 
BYTE    BSR  INHEX    ; GET HEX LEFT
1207 
        BVS  NOTHEX   ; EXIT IF NOT VALID HEX
1208 
        ASLA          ;
1209 
        ASLA          ;
1210 
        ASLA          ; SHIFT INTO LEFT NIBBLE
1211 
        ASLA          ;
1212 
        TFR  A,B      ; PUT HEXL IN "B"
1213 
        BSR  INHEX    ; GET HEX RIGHT
1214 
        BVS  NOTHEX   ; EXIT IF NOT VALID HEX
1215 
        PSHS B        ; PUSH HEXL ON STACK
1216 
        ADDA ,S+      ; ADD HEXL TO HEXR AND ADJ. STK
1217 
        RTS           ; RETURN WITH HEX L&R IN "A"
1218 
*
1219 
*
1220 
INHEX   BSR  ECHON    ; INPUT ASCII CHAR.
1221 
        CMPA #'0      ; IS IT > OR = "0" ?
1222 
        BCS  NOTHEX   ; IF LESS IT AIN'T HEX
1223 
        CMPA #'9      ; IS IT < OR = "9" ?
1224 
        BHI  INHEXA   ; IF > MAYBE IT'S ALPHA
1225 
        SUBA #$30     ; ASCII ADJ. NUMERIC
1226 
        RTS           ;
1227 
*
1228 
*
1229 
INHEXA  CMPA #'A      ; IS IT > OR = "A"
1230 
        BCS  NOTHEX   ; IF LESS IT AIN'T HEX
1231 
        CMPA #'F      ; IS IT < OR = "F" ?
1232 
        BHI  INHEXL   ; IF > IT AIN'T HEX
1233 
        SUBA #'A-10   ; ($37) ASCII ADJ. ALPHA
1234 
        RTS           ;
1235 
*
1236 
INHEXL  CMPA #'a      ; IS IT > OR = "a"
1237 
        BCS  NOTHEX   ; IF LESS IT AIN'T HEX
1238 
        CMPA #'f      ; IS IT < "f"
1239 
        BHI  NOTHEX   ; IF > IT AIN'T HEX
1240 
        SUBA #'a-10   ; ($57) ADJUST TO LOWER CASE
1241 
        RTS           ;
1242 
*
1243 
*
1244 
NOTHEX  ORCC #2       ; SET (V) FLAG IN C-CODES REGISTER
1245 
        RTS           ;
1246 
*
1247 
*
1248 
OUT4H   PSHS X        ; PUSH X-REG. ON THE STACK
1249 
        PULS A        ; POP MS BYTE OF X-REG INTO A-ACC.
1250 
        BSR  OUTHL    ; OUTPUT HEX LEFT
1251 
        PULS A        ; POP LS BYTE OF X-REG INTO A-ACC.
1252 
OUTHL   EQU *
1253 
OUT2H   PSHS A        ; SAVE IT BACK ON STACK
1254 
        LSRA          ; CONVERT UPPER HEX NIBBLE TO ASCII
1255 
        LSRA          ;
1256 
        LSRA          ;
1257 
        LSRA          ;
1258 
        BSR  XASCII   ; PRINT HEX NIBBLE AS ASCII
1259 
OUTHR   PULS A        ; CONVERT LOWER HEX NIBBLE TO ASCII
1260 
        ANDA #$0F     ; STRIP LEFT NIBBLE
1261 
XASCII  ADDA #$30     ; ASCII ADJ
1262 
        CMPA #$39     ; IS IT < OR = "9" ?
1263 
        BLE  OUTC     ; IF LESS, OUTPUT IT
1264 
        ADDA #7       ; IF > MAKE ASCII LETTER
1265 120 dilbert57 
OUTC    BRA  OUTCH    ; OUTPUT CHAR
1266 99 davidgb 
*
1267 
* BINARY / ASCII --- THIS ROUTINE
1268 
* OUTPUTS A BYTE IN ENHANCED
1269 
* BINARY FORMAT. THE ENHANCEMENT
1270 
* IS DONE BY SUBSTITUTING ASCII
1271 
* LETTERS FOR THE ONES IN THE BYTE.
1272 
* THE ASCII ENHANCEMENT LETTERS
1273 
* ARE OBTAINED FROM THE STRING
1274 
* POINTED TO BY THE INDEX REG. "X".
1275 
*
1276 
BIASCI  PSHS A        ; SAVE "A" ON STACK
1277 
        LDB  #8       ; PRESET LOOP# TO BITS PER BYTE
1278 
OUTBA   LDA  ,X+      ; GET LETTER FROM STRING
1279 
        ASL  ,S       ; TEST BYTE FOR "1" IN B7
1280 
        BCS  PRTBA    ; IF ONE PRINT LETTER
1281 
        LDA  #'-      ; IF ZERO PRINT "-"
1282 
PRTBA   BSR  OUTCH    ; PRINT IT
1283 
        BSR  OUT1S    ; PRINT SPACE
1284 
        DECB          ; SUB 1 FROM #BITS YET TO PRINT
1285 
        BNE  OUTBA
1286 
        PULS A,PC
1287 
*
1288 
        IFD EXTOPT
1289 
*
1290 59 davidgb 
* EXTENDED USER COMMANDS
1291 
*
1292 99 davidgb 
USRCMD  JMP [MONEXT+EXTCMD]
1293 
        ENDIF EXTOPT
1294 
*
1295 
*
1296 
ECHON   TST  ECHO     ; IS ECHO REQUIRED ?
1297 
        BEQ  INCH     ; ECHO NOT REQ. IF CLEAR
1298 
*
1299 
* INCHE
1300 
*
1301 
* GETS CHARACTER FROM TERMINAL AND
1302 
* ECHOS SAME. THE CHARACTER IS RETURNED
1303 
* IN THE "A" ACCUMULATOR WITH THE PARITY
1304 
* BIT MASKED OFF. ALL OTHER REGISTERS
1305 
* ARE PRESERVED.
1306 
*
1307 
INCHE   BSR  INCH     ; GET CHAR FROM TERMINAL
1308 
        ANDA #$7F     ; STRIP PARITY FROM CHAR.
1309 
        BRA  OUTCH    ; ECHO CHAR TO TERMINAL
1310 
*
1311 
* INCH
1312 
*
1313 
* GET CHARACTER FROM TERMINAL. RETURN
1314 
* CHARACTER IN "A" ACCUMULATOR AND PRESERVE
1315 
* ALL OTHER REGISTERS. THE INPUT CHARACTER
1316 
* IS 8 BITS AND IS NOT ECHOED.
1317 
*
1318 
*
1319 
INCH    PSHS X        ; SAVE IX
1320 
        IFD  HFCOPT
1321 
        LDA  #$11     ; SET RTS* LOW, REQUEST FAR END TO TX
1322 
        STA  [CPORT]
1323 
        ENDIF HFCOPT
1324 
GETSTA  LDX  CPORT    ; POINT TO TERMINAL PORT
1325 
        LDA  ,X       ; FETCH PORT STATUS
1326 
        BITA #1       ; TEST READY BIT, RDRF ?
1327 
        IFD  PS2OPT
1328 
        BNE  GETST1
1329 
        LDX  #PS2KBD
1330 
        LDA  ,X
1331 
        BITA #1
1332 
        ENDIF PS2OPT
1333 
        BEQ  GETSTA   ; IF NOT RDY, THEN TRY AGAIN
1334 
GETST1  EQU  *
1335 
        IFD  HFCOPT
1336 
        LDA  #$51     ; SET RTS* HIGH, STOP FAR END FROM TXING, UNTIL NEXT INPUT
1337 
        STA  [CPORT]
1338 
        ENDIF HFCOPT
1339 
        LDA  1,X      ; FETCH CHAR
1340 
        PULS X,PC     ; RESTORE IX
1341 
*
1342 
* INCHEK
1343 
*
1344 
* CHECK FOR A CHARACTER AVAILABLE FROM
1345 
* THE TERMINAL. THE SERIAL PORT IS CHECKED
1346 
* FOR READ READY. ALL REGISTERS ARE
1347 
* PRESERVED, AND THE "Z" BIT WILL BE
1348 
* CLEAR IF A CHARACTER CAN BE READ.
1349 
*
1350 
*
1351 
INCHEK  PSHS A        ; SAVE A ACCUM
1352 
        IFD  HFCOPT
1353 
        LDA  #$11     ; SET RTS* LOW, REQUEST FAR END TO TX
1354 
        STA  [CPORT]
1355 
        ENDIF HFCOPT
1356 
        LDA  [CPORT]  ; FETCH PORT STATUS
1357 
        BITA #1       ; TEST READY BIT, RDRF ?
1358 
        IFD  PS2OPT
1359 59 davidgb 
        BNE  INCHEK1
1360 
        LDA  PS2KBD
1361 99 davidgb 
        BITA #1       ; TEST READY BIT< RDRF ?
1362 
        ENDIF PS2OPT
1363 
INCHEK1 PULS A,PC     ; RESTORE A ACCUM.
1364 
*
1365 
OUT2S   BSR  OUT1S    ; OUTPUT 2 SPACES
1366 
OUT1S   LDA  #$20     ; OUTPUT 1 SPACE
1367 
*
1368 
*
1369 
* OUTCH
1370 
*
1371 
* OUTPUT CHARACTER TO TERMINAL.
1372 
* THE CHAR. TO BE OUTPUT IS
1373 
* PASSED IN THE A REGISTER.
1374 
* ALL REGISTERS ARE PRESERVED.
1375 
*
1376 
OUTCH   IFD   VDUOPT
1377 
        BSR   VOUTCH
1378 59 davidgb 
        ENDIF VDUOPT
1379 99 davidgb 
        IFD   DG640OPT
1380 
        BSR   VOUTCH
1381 59 davidgb 
        ENDIF DG640OPT
1382 99 davidgb 
AOUTCH  PSHS A,X      ; SAVE A ACCUM AND IX
1383 
        LDX  CPORT    ; GET ADDR. OF TERMINAL
1384 
FETSTA  LDA  ,X       ; FETCH PORT STATUS
1385 
        BITA #2       ; TEST TDRE, OK TO XMIT ?
1386 
        BEQ  FETSTA   ; IF NOT LOOP UNTIL RDY
1387 
        BITA #8       ; CLEAR TO SEND ?
1388 
        BNE  FETSTA   ; NO, LOOP UNTIL CLEAR
1389 
        PULS A        ; GET CHAR. FOR XMIT
1390 
        STA  1,X      ; XMIT CHAR.
1391 
        PULS X,PC     ; RESTORE IX
1392 
*
1393 59 davidgb 
* IO INITIALIZATION
1394 
*
1395 99 davidgb 
IOINIZ  EQU  *
1396 59 davidgb 
        IFD  VDUOPT
1397 
        BSR  VINIZ
1398 
        ENDIF VDUOPT
1399 
        IFD  DG640OPT
1400 
        BSR  VINIZ
1401 
        ENDIF DG640OPT
1402 99 davidgb 
ACINIZ  LDX  CPORT    ; POINT TO CONTROL PORT ADDRESS
1403 
        LDA  #3       ; RESET ACIA PORT CODE
1404 
        STA  ,X       ; STORE IN CONTROL REGISTER
1405 
        LDA  #$51     ; SET 8 DATA, 2 STOP AN 0 PARITY RTS* HIGH
1406 
        STA  ,X       ; STORE IN CONTROL REGISTER
1407 
        TST  1,X      ; ANYTHING IN DATA REGISTER?
1408 
        LDA  #$FF     ; TURN ON ECHO FLAG
1409 
        STA  ECHO
1410 
        RTS
1411 59 davidgb 
*
1412 
        IFD VDUOPT
1413 99 davidgb 
*
1414 59 davidgb 
***************************************************
1415 
*      VDU8 ADM3A REGISTER-MAPPED EMULATOR        *
1416 
*                                                 *
1417 
*      80 x 25 Characters
1418 
*
1419 
***************************************************
1420 
*
1421 
***************************************************
1422 
*               INITIALIZE EMULATOR               *
1423 
***************************************************
1424 
*
1425 99 davidgb 
VINIZ   LDX  #VDU
1426 
        LDD  #0
1427 
        STD  COLADX   ; AND ROWADX
1428 
        STA  VDUCOL,X
1429 
        STB  VDUROW,X
1430 
        STB  VDUOFF,X
1431 
        STD  NEWROW   ; AND ESCFLG
1432 
        LDB  #$02
1433 
        STB  VDUATT,X
1434 
        CLR  ESCFLG
1435 
        LDA  #$1B     ; SEND ESCAPE
1436 
        BSR  VOUTCH
1437 
        LDA  #'Y      ; CLEAR TO END OF SCREEN
1438 59 davidgb 
*
1439 
** VIDEO OUTPUT ROUTINE
1440 
*
1441 99 davidgb 
VOUTCH  PSHS A,B,X    ; SAVE REGISTERS
1442 
        LDX  #VDU     ; POINT TO VDU REGISTERS
1443 59 davidgb 
*
1444 
** CHECK FOR ESCAPE SEQUENCE
1445 
*
1446 99 davidgb 
        TST  ESCFLG   ; ESCAPE ACTIVE?
1447 
        BEQ  SOROU1   ; BRANCH IF NOT
1448 
        BSR  ESCAPE   ; ELSE DO ESCAPE
1449 
        BRA  RETURN   ; AND RETURN
1450 59 davidgb 
*
1451 
** CHECK FOR CONTROL CHARACTERS
1452 
*
1453 99 davidgb 
SOROU1  CMPA #$20     ; CONTROL CODES?
1454 
        BHS  SOROU2
1455 
        BSR  CONTRL   ; BRANCH IF SO
1456 
        BRA  RETURN
1457 59 davidgb 
*
1458 
** OUTPUT TEXT CHARACTER
1459 
*
1460 99 davidgb 
SOROU2  STA  VDUCHR,X ; DISPLAY CHARACTER
1461 
        LBSR NEWCOL   ; UPDATE COLUMN
1462 59 davidgb 
*
1463 
** DISPLAY CURSOR AND RETURN
1464 
*
1465 99 davidgb 
RETURN  PULS A,B,X,PC ; RESTORE REGISTERS AND RETURN
1466 59 davidgb 
*
1467 
***************************************************
1468 
*              CONTROL CODE HANDLERS              *
1469 
***************************************************
1470 
*
1471 99 davidgb 
CONTRL  CMPA #$08     ; CTRL H - BACKSPACE ?
1472 
        BEQ  BACKSP
1473 
        CMPA #$1B     ; ESCAPE SEQUENCE?
1474 
        BEQ  SETESC
1475 
        CMPA #$1A     ; CTRL Z - Clear Screen
1476 
        LBEQ CLRSCR
1477 
        CMPA #$16     ; CTRL ^ - Home
1478 
        BEQ  HOME
1479 
        CMPA #$0D     ; CTRL M - RETURN?
1480 
        LBEQ CRETN
1481 
        CMPA #$0C     ; CTRL L - CHAR RIGHT
1482 
        BEQ  CHRIGHT
1483 
        CMPA #$0B     ; CTRL K - MOVE UP ONE LINE
1484 
        BEQ  LINEUP
1485 
        CMPA #$0A     ; CTRL J - LINE FEED
1486 
        BNE  RETESC   ; NONE OF THESE, RETURN
1487 59 davidgb 
*
1488 
***************************************** LINE FEED
1489 
*
1490 99 davidgb 
LINEFD  LDD  COLADX   ; GET CURRENT COLUMN AND ROW
1491 
        INCB          ; BUMP ROW
1492 
        CMPB #NUMLIN  ; SCROLL TIME?
1493 
        BNE  NEWCUR   ; POSITION CURSOR IF NOT
1494 
        LBRA SCROLL   ; ELSE SCROLL IT
1495 59 davidgb 
*
1496 
***************************************** LINE FEED
1497 
*
1498 99 davidgb 
LINEUP  LDD  COLADX   ; GET CURRENT COLUMN AND ROW
1499 
        TSTB          ; AT TOP OF SCREEN ?
1500 
        BEQ  RETESC   ; Yes, Ignore
1501 
        DECB          ; No, Decrement ROW
1502 
        BRA  NEWCUR   ; POSITION CURSOR
1503 59 davidgb 
*
1504 
*********************************** BACK SPACE
1505 
*
1506 99 davidgb 
BACKSP  LDA  COLADX
1507 
        BEQ  RETESC   ; RETURN
1508 59 davidgb 
        DECA
1509 99 davidgb 
        BRA  POSCOL   ; POSITION CURSOR
1510 59 davidgb 
*
1511 
*********************************** CURSOR RIGHT
1512 
*
1513 99 davidgb 
CHRIGHT LDA  COLADX
1514 59 davidgb 
        INCA
1515 99 davidgb 
        CMPA #LINLEN
1516 
        BEQ  RETESC
1517 
        BRA  POSCOL
1518 59 davidgb 
*
1519 
*********************************** CURSOR RIGHT
1520 
*
1521 99 davidgb 
HOME    LDD  #0       ; HOME - POSITION TOP OF SCREEN
1522 
        BRA  NEWCUR
1523 59 davidgb 
*
1524 
***************************************************
1525 
*                 ESCAPE HANDLERS                 *
1526 
***************************************************
1527 
*
1528 99 davidgb 
ESCAPE  LDB  ESCFLG   ; GET FLAG
1529 
        CMPB #'=      ; SETTING CURSOR?
1530 
        BEQ  ESCCUR   ; BRANCH IF SO
1531 
        CMPA #'Y      ; CLEAR TO END OF SCREEN?
1532 
        BEQ  ESCCLS
1533 
        CMPA #'T      ; CLEAR TO END OF LINE?
1534 
        BEQ  ESCCLL
1535 
        CMPA #'=      ; STARTING CURSOR SET?
1536 
        BNE  CLRESC   ; BRANCH IF NOT
1537 59 davidgb 
*
1538 
***************************** START ESCAPE SEQUENCE
1539 
*
1540 99 davidgb 
SETESC  STA  ESCFLG   ; ELSE START CURSORING
1541 
        RTS           ; AND RETURN
1542 59 davidgb 
*
1543 99 davidgb 
CLRESC  CLR  ESCFLG   ; NO OTHERS SUPPORTED
1544 
RETESC  RTS           ; SO RETURN
1545 59 davidgb 
*
1546 
********************************* SET SCREEN CURSOR
1547 
*
1548 99 davidgb 
ESCCUR  TST  NEWROW   ; ROW SET?
1549 
        BNE  ESCCU1   ; BRANCH IF SO
1550 
        STA  NEWROW   ; ELSE SET NEW ROW
1551 
        RTS           ; AND RETURN
1552 59 davidgb 
*
1553 99 davidgb 
ESCCU1  CLR  ESCFLG
1554 
        SUBA #$20     ; ADJUST COLUMN ADDRESS
1555 
        CMPA #LINLEN-1 ;CHECK FOR ACCEPTABLE COLUM
1556 
        BHI  RETESC   ; NOT OK, DO NOTHING
1557 59 davidgb 
*
1558 99 davidgb 
ESCCU2  LDB  NEWROW
1559 
        CLR  NEWROW
1560 
        SUBB #$20     ; ADJUST TO ROW ADDRESS
1561 
        CMPB #NUMLIN-1 ; CHECK FOR ACCEPTABLE ROW
1562 
        BHI  RETESC   ; ELSE RETURN DOING NOTHING
1563 
        BRA  NEWCUR   ; GO SET NEW CURSOR IF SO
1564 59 davidgb 
*
1565 
****************** CLEAR FROM CURSOR TO END OF LINE
1566 99 davidgb 
*
1567 
CLRSCR  LDD  #0       ; CLEAR FROM TOP OF SCREEN
1568 
        BSR  NEWCUR
1569 
ESCCLL  LDA  COLADX
1570 
        LDB  #$20     ; AND CLEAR CHAR
1571 
ESCCL1  STB  VDUCHR,X ; DISPLAY TEXT
1572 59 davidgb 
        INCA
1573 99 davidgb 
        STA  VDUCOL,X
1574 
        CMPA #LINLEN  ; UNTIL END OF LINE
1575 
        BNE  ESCCL1
1576 
        CLR  ESCFLG
1577 59 davidgb 
        RTS
1578 
*
1579 
*********************************** CARRIAGE RETURN
1580 
*
1581 99 davidgb 
CRETN   CLRA          ; SET COLUMN ZERO
1582 
POSCOL  LDB  ROWADX   ; GET CURRENT ROW
1583 59 davidgb 
*
1584 
*********** GENERATE NEW CURSOR POSITION AND RETURN
1585 
*
1586 99 davidgb 
NEWCUR  STD  COLADX   ; SAVE NEW ROW AND COLUMN
1587 
        STA  VDUCOL,X ; SET NEW COLUMN
1588 
        STB  VDUROW,X ; SET NEW ROW
1589 
        RTS           ; AND RETURN
1590 59 davidgb 
*
1591 
********************* UPDATE CURRENT COLUMN AND ROW
1592 
*
1593 99 davidgb 
NEWCOL  LDD  COLADX   ; GET ROW AND COLUMN
1594 
        INCA          ; BUMP COLUMN
1595 
        CMPA #LINLEN  ; ROLL?
1596 
        BNE  NEWCUR   ; BRANCH IF NOT
1597 
        CLRA          ; ELSE RESET TO ZERO
1598 
        INCB          ; AND BUMP ROW
1599 
        CMPB #NUMLIN
1600 
        BNE  NEWCUR
1601 
        DECB          ; BOTTOM ROW
1602 
        BSR  NEWCUR
1603 59 davidgb 
*
1604 
********************************* SCROLL THE SCREEN
1605 
*
1606 99 davidgb 
SCROLL  LDB  VDUOFF,X
1607 59 davidgb 
        INCB
1608 99 davidgb 
        CMPB #NUMLIN
1609 
        BLO  SCROL1
1610 59 davidgb 
        CLRB
1611 99 davidgb 
SCROL1  STB  VDUOFF,X
1612 59 davidgb 
*
1613 
**************** CLEAR FROM CURSOR TO END OF SCREEN
1614 
*
1615 99 davidgb 
ESCCLS  LDB  COLADX   ; GET CURSOR
1616 
        LDA  #$20     ; GET A SPACE
1617 
ESCCLS1 STB  COLADX
1618 
        STB  VDUCOL,X
1619 
        STA  VDUCHR,X
1620 59 davidgb 
        INCB
1621 99 davidgb 
        CMPB #LINLEN
1622 
        BNE  ESCCLS1
1623 59 davidgb 
*
1624 99 davidgb 
        LDB  ROWADX
1625 59 davidgb 
        INCB
1626 99 davidgb 
        CMPB #NUMLIN
1627 
        BEQ  ESCCLS2
1628 
        STB  ROWADX
1629 
        STB  VDUROW,X
1630 59 davidgb 
        CLRB
1631 99 davidgb 
        BRA  ESCCLS1
1632 59 davidgb 
*
1633 
ESCCLS2 CLRB
1634 99 davidgb 
        STB  COLADX
1635 
        STB  VDUCOL,X
1636 
        STB  ESCFLG
1637 59 davidgb 
        RTS
1638 
        ENDIF VDUOPT
1639 99 davidgb 
*
1640 59 davidgb 
        IFD DG640OPT
1641 
***************************************************
1642 
*      TELEVIDEO-TYPE MEMORY-MAPPED EMULATOR      *
1643 
*                                                 *
1644 
* FOR HARD-WIRED MEMORY-MAPPED DISPLAYS USING THE *
1645 
* HIGH ORDER BIT OF EACH BYTE FOR  REVERSE  VIDEO *
1646 
* CURSORING  (SUCH  AS THE THOMAS INSTRUMENTATION *
1647 
* 16x64 BOARD).                                   *
1648 
***************************************************
1649 99 davidgb 
*
1650 59 davidgb 
***************************************************
1651 
*               INITIALIZE EMULATOR               *
1652 
***************************************************
1653 
*
1654 99 davidgb 
VINIZ   LDX  #0
1655 
        STX  COLADX   ; AND ROWADX
1656 
        STX  NEWROW   ; AND ESCFLG
1657 
        LDX  #SCREEN  ; POINT TO SCREEN
1658 
        STX  CURSOR   ; SET PROGRAM CURSOR
1659 
        LDA  #$1B     ; SEND ESCAPE
1660 
        BSR  VOUTCH
1661 
        LDA  #'Y      ; CLEAR TO END OF SCREEN
1662 
*
1663 59 davidgb 
** VIDEO OUTPUT ROUTINE
1664 
*
1665 99 davidgb 
VOUTCH  PSHS A,B,X    ; SAVE REGISTERS
1666 59 davidgb 
*
1667 
** CLEAR CURSOR
1668 
*
1669 99 davidgb 
        LDX  CURSOR
1670 
        LDB  0,X
1671 
        ANDB #$7F
1672 
        STB  0,X
1673 
*
1674 59 davidgb 
** CHECK FOR ESCAPE SEQUENCE
1675 
*
1676 99 davidgb 
        TST  ESCFLG   ; ESCAPE ACTIVE?
1677 
        BEQ  SOROU1   ; BRANCH IF NOT
1678 
        BSR  ESCAPE   ; ELSE DO ESCAPE
1679 
        BRA  RETURN   ; AND RETURN
1680 
*
1681 59 davidgb 
** CHECK FOR CONTROL CHARACTERS
1682 
*
1683 99 davidgb 
SOROU1  CMPA #$20     ; CONTROL CODES?
1684 
        BHS  SOROU2
1685 
        BSR  CONTRL   ; BRANCH IF SO
1686 
        BRA  RETURN
1687 
*
1688 59 davidgb 
** OUTPUT TEXT CHARACTER
1689 
*
1690 99 davidgb 
SOROU2  LDX  CURSOR   ; ELSE GET CURSOR
1691 
        STA  0,X      ; DISPLAY CHARACTER
1692 
        LBSR NEWCOL   ; UPDATE COLUMN
1693 
*
1694 59 davidgb 
** DISPLAY CURSOR AND RETURN
1695 99 davidgb 
*
1696 
RETURN  LDX  CURSOR   ; AND DISPLAY IT
1697 
        LDB  ,X
1698 
        ORB  #$80     ; WITH REVID
1699 
        STB  ,X
1700 
        PULS A,B,X,PC ; RESTORE REGISTERS AND RETURN
1701 
*
1702 59 davidgb 
***************************************************
1703 
*              CONTROL CODE HANDLERS              *
1704 
***************************************************
1705 99 davidgb 
*
1706 
CONTRL  CMPA #$08     ; CTRL H - BACKSPACE ?
1707 
        LBEQ BACKSP
1708 
        CMPA #$1B     ; ESCAPE SEQUENCE?
1709 
        LBEQ SETESC
1710 
        CMPA #$D      ; CTRL M - RETURN?
1711 
        LBEQ CRETN
1712 
        CMPA #$0A     ; CTRL J - LINE FEED
1713 
        BNE  RETESC   ; NONE OF THESE, RETURN
1714 
*
1715 59 davidgb 
***************************************** LINE FEED
1716 99 davidgb 
*
1717 
LINEFD  LDD  COLADX   ; GET CURRENT COLUMN AND ROW
1718 
        INCB          ; BUMP ROW
1719 
        CMPB #NUMLIN  ; SCROLL TIME?
1720 
        LBNE NEWCUR   ; POSITION CURSOR IF NOT
1721 
        LBRA SCROLL   ; ELSE SCROLL IT
1722 
*
1723 59 davidgb 
***************************************** LINE FEED
1724 99 davidgb 
*
1725 
LINEUP  LDD  COLADX   ; GET CURRENT COLUMN AND ROW
1726 
        TSTB          ; AT TOP OF SCREEN ?
1727 
        BEQ  RETESC   ; YES, RETURN
1728 
        DECB          ; NO, DECREMENT ROW
1729 
        LBRA NEWCUR   ; POSITION CURSOR
1730 
*
1731 59 davidgb 
*********************************** BACK SPACE
1732 99 davidgb 
*
1733 
BACKSP  LDA  COLADX    ; GET CURRENT COLUMN AND ROW
1734 
        BEQ  RETESC    ; IF AT TOP LEFT CORNER RETURN
1735 
        DECA           ; OTHERWISE BACK STEP ONE CHARACTER
1736 
        LBRA POSCOL    ; POSITION CURSOR
1737 
*
1738 59 davidgb 
*********************************** CURSOR RIGHT
1739 99 davidgb 
*
1740 
CHRIGHT LDA  COLADX    ; GET CURRENT COLUMN AND ROW
1741 
        INCA           ; MOVE RIGHT ONE CHARACTER
1742 
        CMPA #LINLEN   ; ARE WE AT THE END OF THE LINE ?
1743 
        BEQ  RETESC    ; YES, RETURN
1744 
        LBRA POSCOL    ; NO, POSITION CURSOR
1745 
*
1746 59 davidgb 
***************************************************
1747 
*                 ESCAPE HANDLERS                 *
1748 
***************************************************
1749 99 davidgb 
*
1750 
ESCAPE  LDB  ESCFLG   ; ARE WE IN AN ESCAPE SEQUENCE ?
1751 
        CMPB #'=      ; ARE WE SETTING CURSOR?
1752 
        BEQ  ESCCUR   ; YES BRANCH TO SET CURSOR
1753 
        CMPA #'Y      ; CLEAR TO END OF SCREEN?
1754 
        LBEQ ESCCLS   ; YES, CLEAR SCREEN
1755 
        CMPA #'T      ; CLEAR TO END OF LINE?
1756 
        BEQ  ESCCLL   ; YES, CLEAR LINE
1757 
        CMPA #'E      ; INSERT LINE?
1758 
        BEQ  ESCINL
1759 
        CMPA #'R      ; DELETE LINE?
1760 
        BEQ  ESCDLL
1761 
        CMPA #'=      ; STARTING CURSOR SET?
1762 
        BNE  CLRESC   ; BRANCH IF NOT
1763 
*
1764 59 davidgb 
***************************** START ESCAPE SEQUENCE
1765 99 davidgb 
*
1766 
SETESC  STA  ESCFLG   ; ELSE START CURSORING
1767 
        RTS           ; AND RETURN
1768 
*
1769 
CLRESC  CLR  ESCFLG   ; NO OTHERS SUPPORTED
1770 
RETESC  RTS           ;  SO RETURN
1771 
*
1772 59 davidgb 
********************************* SET SCREEN CURSOR
1773 
*
1774 99 davidgb 
ESCCUR  TST  NEWROW   ; ROW SET?
1775 
        BNE  ESCCU1   ; BRANCH IF SO
1776 
        STA  NEWROW   ; ELSE SET NEW ROW
1777 
        RTS           ;  AND RETURN
1778 
*
1779 
ESCCU1  CLR  ESCFLG
1780 
        SUBA #$20      ; ADJUST COLUMN ADDRESS
1781 
        CMPA #LINLEN-1 ; CHECK FOR ACCEPTABLE COLUM
1782 
        BHI  RETESC    ; NOT OK, DO NOTHING
1783 
*
1784 
ESCCU2  LDB  NEWROW
1785 
        CLR  NEWROW
1786 
        SUBB #$20      ; ADJUST TO ROW ADDRESS
1787 
        CMPB #NUMLIN-1 ; CHECK FOR ACCEPTABLE ROW
1788 
        BHI  RETESC    ; ELSE RETURN DOING NOTHING
1789 
        BRA  NEWCUR    ; GO SET NEW CURSOR IF SO
1790 
*
1791 59 davidgb 
*************************** DELETE LINE FROM SCREEN
1792 99 davidgb 
*
1793 
ESCDLL  BSR  CRETN     ; GO COL. ZERO
1794 
        LDB  ROWADX
1795 
        CMPB #NUMLIN-1
1796 
        BEQ  SCROL3
1797 
        BRA  SCROL1    ; AND DELETE THIS LINE
1798 
*
1799 59 davidgb 
*************************** INSERT LINE INTO SCREEN
1800 
*
1801 99 davidgb 
ESCINL  BSR  CRETN     ; GO TO COL. ZERO
1802 
        LDB  ROWADX
1803 
        CMPB #NUMLIN-1
1804 
        BEQ  ESCCLL
1805 
*
1806 59 davidgb 
** SCROLL SCREEN DOWN FROM CURSOR
1807 
*
1808 99 davidgb 
        LDX  #SCREEN+SCNLEN-LINLEN
1809 
ESCIN0  LDA  ,-X
1810 
        STA  LINLEN,X
1811 
        LDA  SCNLEN,X
1812 
        STA  SCNLEN+LINLEN,X
1813 
        CMPX CURSOR
1814 
        BNE  ESCIN0
1815 
*
1816 59 davidgb 
****************** CLEAR FROM CURSOR TO END OF LINE
1817 99 davidgb 
*
1818 
ESCCLL  LDA  COLADX    ; GET CURRENT COLUMN
1819 
        LDX  CURSOR    ; GET CURSOR
1820 
        LDB  #$20      ; AND CLEAR CHAR
1821 
ESCLL1  STB  SCNLEN,X  ; CLEAR ATTRIBUTE
1822 
        STB  ,X+       ; CLEAR TEXT
1823 59 davidgb 
        INCA
1824 99 davidgb 
        CMPA #LINLEN   ; UNTIL END OF LINE
1825 
        BNE  ESCLL1
1826 
        CLR  ESCFLG
1827 59 davidgb 
        RTS
1828 99 davidgb 
*
1829 59 davidgb 
*********************************** CARRIAGE RETURN
1830 99 davidgb 
*
1831 
CRETN   CLRA           ; SET COLUMN ZERO
1832 
POSCOL  LDB  ROWADX    ; GET CURRENT ROW
1833 
*
1834 59 davidgb 
*********** GENERATE NEW CURSOR POSITION AND RETURN
1835 99 davidgb 
*
1836 
NEWCUR  STD  COLADX    ; SAVE NEW ROW AND COLUMN
1837 
        LDA  #LINLEN   ; ELSE ADD A LINE
1838 
        MUL            ; LINLEN * ROWADX
1839 
        ADDB COLADX
1840 
        ADCA #0
1841 
        ADDD #SCREEN   ; ADD SCREEN BASE.
1842 
        STD  CURSOR    ; SAVE NEW CURSOR
1843 
        TFR  D,X       ; GET CURSOR IN X
1844 
        RTS            ; AND RETURN
1845 
*
1846 59 davidgb 
********************* UPDATE CURRENT COLUMN AND ROW
1847 99 davidgb 
*
1848 
NEWCOL  LDD  COLADX    ; GET ROW AND COLUMN
1849 
        INCA           ; BUMP COLUMN
1850 
        CMPA #LINLEN   ; ROLL?
1851 
        BNE  NEWCUR    ; BRANCH IF NOT
1852 
        CLRA           ; ELSE RESET TO ZERO
1853 
        INCB           ; AND BUMP ROW
1854 
        CMPB #NUMLIN
1855 
        BNE  NEWCUR
1856 
        DECB           ; BOTTOM ROW
1857 
        BSR  NEWCUR
1858 
*
1859 59 davidgb 
********************************* SCROLL THE SCREEN
1860 99 davidgb 
*
1861 
SCROLL  LDX  #SCREEN   ; POINT TO SCREEN
1862 
SCROL1  LDA  SCNLEN+LINLEN,X
1863 
        STA  SCNLEN,X
1864 
        LDA  LINLEN,X  ; MOVE TWO BYTES
1865 
        STA  ,X+       ; UP ONE LINE
1866 
        CMPX #SCREEN+SCNLEN-LINLEN
1867 
        BNE  SCROL1    ; LOOP UNTIL DONE
1868 
        BRA  SCROL3
1869 
*
1870 59 davidgb 
**************** CLEAR FROM CURSOR TO END OF SCREEN
1871 99 davidgb 
*
1872 
ESCCLS  LDX   CURSOR   ; GET CURSOR
1873 
SCROL3  LDA   #$20     ; GET A SPACE
1874 
SCROL2  STA   SCNLEN,X ; CLEAR ATTRIBUTES
1875 
        STA   ,X+      ; AND TEXT
1876 59 davidgb 
        CMPX  #SCREEN+SCNLEN
1877 99 davidgb 
        BNE   SCROL2   ; UNTIL DONE
1878 59 davidgb 
        CLR   ESCFLG
1879 
        RTS
1880 
        ENDIF DG640OPT
1881 
*
1882 
        IFD PRTOPT
1883 
*************************************
1884 
*
1885 
** PRINTER DRIVER ROUTINES
1886 
*
1887 
*************************************
1888 
*
1889 
** PINIZ - INITIATE PRINTER PORT
1890 
*
1891 
PINIZ   PSHS B
1892 99 davidgb 
        LDD #DIRMSK*256+$04 ; ACCA=DIRMSK ACCB=$04
1893 
        STD PADATA     ; SET DDR AND SELECT DATA
1894 59 davidgb 
*
1895 
** RESET PRINTER
1896 
*
1897 99 davidgb 
        LDB  #PRESET
1898 
        STB  PADATA
1899 
RESTLP  INCB           ; DELAY FOR RESET
1900 
        BNE  RESTLP
1901 
        STA  PADATA    ; ACCA=DIRMSK
1902 
*
1903 59 davidgb 
** INITALIZE PORT B (DATA PORT)
1904 
*
1905 99 davidgb 
        LDA  #$2A
1906 
        STA  PBCTRL
1907 
        LDD  #$FF2E    ; ACCA=$FF ACCB =%00101110
1908 
        STD  PBDATA    ; PBDREG   PBCTRL
1909 
*
1910 59 davidgb 
** SELECT 66 LINES/PAGE
1911 99 davidgb 
*
1912 
        LDA  #$1B
1913 
        BSR  POUTCH
1914 
        LDA  #'C
1915 
        BSR  POUTCH
1916 
        LDA  #66
1917 59 davidgb 
        PULS B
1918 
*************************************
1919 
*
1920 
** OUTPUT A CHARACTER TO THE PRINTER
1921 
*
1922 
*************************************
1923 
POUTCH  PSHS B
1924 99 davidgb 
        LDB  PBDATA    ; CLEAR INTERRUPT BIT
1925 59 davidgb 
*
1926 
** WAIT TILL NOT BUSY
1927 99 davidgb 
*
1928 
BUSYLP  LDB  PADATA
1929 59 davidgb 
        BITB #PERROR
1930 99 davidgb 
        BEQ  PEXIT
1931 59 davidgb 
        TSTB
1932 99 davidgb 
        BMI  BUSYLP
1933 59 davidgb 
*
1934 
** NOW OUTPUT CHARACTER
1935 99 davidgb 
*
1936 
        STA  PBDATA
1937 59 davidgb 
PEXIT   PULS B,PC
1938 
*************************************
1939 
*
1940 
** PCHK TEST IFD PRINTER READY
1941 
*
1942 
*************************************
1943 99 davidgb 
PCHK    TST  PBCTRL    ; TEST STATE OF CRB7
1944 
        RTS            ; SET ON ACKNOWLEDGE
1945 59 davidgb 
        ENDIF PRTOPT
1946 
*************************************
1947 
*
1948 99 davidgb 
* MONITOR KEYBOARD COMMAND JUMP TABLE
1949 
*
1950 59 davidgb 
*************************************
1951 99 davidgb 
*
1952 
JMPTAB  EQU *
1953 
        FCB 1 " ^A "
1954 
        FDB ALTRA
1955 
        FCB 2 " ^B "
1956 
        FDB ALTRB
1957 
        FCB 3 " ^C "
1958 
        FDB ALTRCC
1959 
        FCB 4 " ^D "
1960 
        FDB ALTRDP
1961 
        FCB $10 " ^P "
1962 
        FDB ALTRPC
1963 
        FCB $15 " ^U "
1964 
        FDB ALTRU
1965 
        FCB $18 " ^X "
1966 
        FDB ALTRX
1967 
        FCB $19 " ^Y "
1968 
        FDB ALTRY
1969 
*
1970 
        FCC 'B'
1971 
        FDB BRKPNT
1972 
        FCC 'E'
1973 
        FDB MEMDUMP
1974 
        FCC 'G'
1975 
        FDB GO
1976 
        FCC 'L'
1977 
        FDB LOAD
1978 
        FCC 'P'
1979 
        FDB PUNCH
1980 
        FCC 'M'
1981 
        FDB MEMCHG
1982 
        FCC 'R'
1983 
        FDB REGSTR
1984 
        FCC 'S'
1985 
        FDB DISSTK
1986 
        FCC 'X'
1987 
        FDB XBKPNT
1988 
        IFD MFDCOPT
1989 
        FCC 'D'        ; *** SWTPC USES 'U' FOR MINIBOOT
1990 
        FDB MINBOOT
1991 
        ENDIF MFDCOPT
1992 
        IFD CF8OPT
1993 
        FCC 'D'        ; *** FPGA 8 BIT USES 'D' FOR CFBOOT
1994 
        FDB CFBOOT
1995 
        ENDIF CF8OPT
1996 
        IFD IDEOPT
1997 
        FCC 'D'        ; *** XESS FPGA 16 BIT IDE USES 'D' FOR IDEBOOT
1998 
        FDB IDEBOOT
1999 
        ENDIF IDEOPT
2000 
        IFD DMAFOPT
2001 
        FCC 'U'        ; *** SWTPC USES 'D' FOR DMAF2 BOOT
2002 
        FDB DBOOT
2003 
        ENDIF DMAFOPT
2004 
        IFD EXTOPT
2005 
        FCC 'U'        ; *** IF FPGA, 'U' IS FOR USER
2006 
        FDB USRCMD
2007 
        ENDIF EXTOPT
2008 
        IFD RTCOPT
2009 
        FCC 'T'
2010 
        FDB TIMSET
2011 
        ENDIF RTCOPT
2012 
        IFD TRAOPT
2013 
        FCC "T"
2014 
        FDB TRACE
2015 
        ENDIF TRAOPT
2016 
*
2017 
TABEND  EQU *
2018 
*
2019 
* ** 6809 VECTOR ADDRESSES **
2020 
*
2021 
* FOLLOWING ARE THE ADDRESSES OF THE VECTOR ROUTINES
2022 
* FOR THE 6809 PROCESSOR. DURING INITIALIZATION THEY
2023 
* ARE RELOCATED TO RAM FROM $DFC0 TO $DFCF. THEY ARE
2024 
* RELOCATED TO RAM SO THAT THE USER MAY REVECTOR TO
2025 
* HIS OWN ROUTINES IF HE SO DESIRES.
2026 
*
2027 
*
2028 
RAMVEC  FDB SWIE       ; USER-V
2029 
        FDB RTI        ; SWI3-V
2030 
        FDB RTI        ; SWI2-V
2031 
        FDB RTI        ; FIRQ-V
2032 
        FDB RTI        ; IRQ-V
2033 
        FDB SWIE       ; SWI-V
2034 
        FDB $FFFF      ; SVC-VO
2035 
        FDB $FFFF      ; SVC-VL
2036 
*
2037 
* PRINTABLE MESSAGE STRINGS
2038 
*
2039 
MSG1    FCB  $D,$A,$0,$0,$0 * 0, CR/LF, 0
2040 120 dilbert57 
        FCC  'SYS09BUG 1.7 FOR '
2041 
        IFD  SWTOPT
2042 
        FCC  'SWTPC'
2043 99 davidgb 
        ENDIF SWTOPT
2044 
        IFD  ADSOPT
2045 120 dilbert57 
        FCC  'ADS6809'
2046 99 davidgb 
        ENDIF ADSOPT
2047 
        IFD  B3SOPT
2048 120 dilbert57 
        FCC  'B3-S2+'
2049 99 davidgb 
        ENDIF B3SOPT
2050 
        IFD  B5XOPT
2051 120 dilbert57 
        FCC  'B5-X300'
2052 99 davidgb 
        ENDIF B5XOPT
2053 
        IFD  S3SOPT
2054 120 dilbert57 
        FCC  'S3STARTER'
2055 99 davidgb 
        ENDIF S3SOPT
2056 
        IFD  S3EOPT
2057 120 dilbert57 
        FCC  'S3E'
2058 99 davidgb 
        ENDIF S3EOPT
2059 120 dilbert57 
        IFD  XESOPT
2060 
        FCC  'XESS'
2061 99 davidgb 
        ENDIF XESOPT
2062 120 dilbert57 
        IFD  DE270OPT
2063 
        FCC  'DE2-70'
2064 
        ENDIF DE270OPT
2065 99 davidgb 
        FCC ' - '
2066 
        FCB 4
2067 
MSG2    FCB 'K,$0D,$0A,$00,$00,$00,$04 ; K,,,3 NULS,
2068 
MSG3    FCC '>'
2069 
        FCB 4
2070 
MSG4    FCC 'WHAT?'
2071 
        FCB 4
2072 
MSG5    FCC ' - '
2073 
        FCB 4'
2074 
MSG10   FCC '  SP='
2075 
        FCB 4
2076 
MSG11   FCC '  PC='
2077 
        FCB 4
2078 
MSG12   FCC '  US='
2079 
        FCB 4
2080 
MSG13   FCC '  IY='
2081 
        FCB 4
2082 
MSG14   FCC '  IX='
2083 
        FCB 4
2084 
MSG15   FCC '  DP='
2085 
        FCB 4
2086 
MSG16   FCC '  A='
2087 
        FCB 4
2088 
MSG17   FCC '  B='
2089 
        FCB 4
2090 
MSG18   FCC '  CC: '
2091 
        FCB 4
2092 
MSG19   FCC 'EFHINZVC'
2093 
MSG20   FCC 'S1'
2094 
        FCB 4
2095 59 davidgb 
        IFD DATOPT
2096 
*
2097 99 davidgb 
* POWER UP/ RESET/ NMI ENTRY POINT
2098 
*
2099 
        ORG $FF00
2100 
*
2101 
*
2102 
START   LDX  #IC11    ; POINT TO DAT RAM IC11
2103 
        LDA  #$0F     ; GET COMPLIMENT OF ZERO
2104 
*
2105 
*
2106 
* INITIALIZE DAT RAM --- LOADS $F-$0 IN LOCATIONS $0-$F
2107 
* OF DAT RAM, THUS STORING COMPLEMENT OF MSB OF ADDRESS
2108 
* IN THE DAT RAM. THE COMPLEMENT IS REQUIRED BECAUSE THE
2109 
* OUTPUT OF IC11, A 74S189, IS THE INVERSE OF THE DATA
2110 
* STORED IN IT.
2111 
*
2112 
*
2113 
DATLP   STA  ,X+       ; STORE & POINT TO NEXT RAM LOCATION
2114 
        DECA           ; GET COMP. VALUE FOR NEXT LOCATION
2115 
        BNE  DATLP     ; ALL 16 LOCATIONS INITIALIZED ?
2116 
*
2117 
* NOTE: IX NOW CONTAINS $0000, DAT RAM IS NO LONGER
2118 
*       ADDRESSED, AND LOGICAL ADDRESSES NOW EQUAL
2119 
*       PHYSICAL ADDRESSES.
2120 
*
2121 
        LDA  #$F0
2122 
        STA  ,X        ; STORE $F0 AT $FFFF
2123 
        LDX  #$D0A0    ; ASSUME RAM TO BE AT $D000-$DFFF
2124 
        LDY  #TSTPAT   ; LOAD TEST DATA PATTERN INTO "Y"
2125 
TSTRAM  LDU  ,X        ; SAVE DATA FROM TEST LOCATION
2126 
        STY  ,X        ; STORE TEST PATTERN AT $D0A0
2127 
        CMPY ,X        ; IS THERE RAM AT THIS LOCATION ?
2128 
        BEQ  CNVADR    ; IF MATCH THERE'S RAM, SO SKIP
2129 
        LEAX -$1000,X  ; ELSE POINT 4K LOWER
2130 
        CMPX #$F0A0    ; DECREMENTED PAST ZER0 YET ?
2131 
        BNE  TSTRAM    ; IF NOT CONTINUE TESTING FOR RAM
2132 
        BRA  START     ; ELSE START ALL OVER AGAIN
2133 
*
2134 
*
2135 
* THE FOLLOWING CODE STORES THE COMPLEMENT OF
2136 
* THE MS CHARACTER OF THE FOUR CHARACTER HEX
2137 
* ADDRESS OF THE FIRST 4K BLOCK OF RAM LOCATED
2138 
* BY THE ROUTINE "TSTRAM" INTO THE DAT RAM. IT
2139 
* IS STORED IN RAM IN THE LOCATION THAT IS
2140 
* ADDRESSED WHEN THE PROCESSOR ADDRESS IS $D---,
2141 
* THUS IF THE FIRST 4K BLOCK OF RAM IS FOUND
2142 
* WHEN TESTING LOCATION $70A0, MEANING THERE
2143 
* IS NO RAM PHYSICALLY ADDRESSED IN THE RANGE
2144 
* $8000-$DFFF, THEN THE COMPLEMENT OF THE
2145 
* "7" IN THE $70A0 WILL BE STORED IN
2146 
* THE DAT RAM. THUS WHEN THE PROCESSOR OUTPUTS
2147 
* AN ADDRESS OF $D---, THE DAT RAM WILL RESPOND
2148 
* BY RECOMPLEMENTING THE "7" AND OUTPUTTING THE
2149 
* 7 ONTO THE A12-A15 ADDRESS LINES. THUS THE
2150 
* RAM THAT IS PHYSICALLY ADDRESSED AT $7---
2151 
* WILL RESPOND AND APPEAR TO THE 6809 THAT IT
2152 
* IS AT $D--- SINCE THAT IS THE ADDRESS THE
2153 
* 6809 WILL BE OUTPUTING WHEN THAT 4K BLOCK
2154 
* OF RAM RESPONDS.
2155 
*
2156 
*
2157 
CNVADR  STU  ,X        ; RESTORE DATA AT TEST LOCATION
2158 
        TFR  X,D       ; PUT ADDR. OF PRESENT 4K BLOCK IN D
2159 
        COMA           ; COMPLEMENT MSB OF THAT ADDRESS
2160 
        LSRA           ; PUT MS 4 BITS OF ADDRESS IN
2161 
        LSRA           ; LOCATION D0-D3 TO ALLOW STORING
2162 
        LSRA           ; IT IN THE DYNAMIC ADDRESS
2163 
        LSRA           ; TRANSLATION RAM.
2164 
        STA  $FFFD     ; STORE XLATION FACTOR IN DAT "D"
2165 
*
2166 
        LDS  #STACK    ; INITIALIZE STACK POINTER
2167 
*
2168 
*
2169 
* THE FOLLOWING CHECKS TO FIND THE REAL PHYSICAL ADDRESSES
2170 
* OF ALL 4K BLKS OF RAM IN THE SYSTEM. WHEN EACH 4K BLK
2171 
* OF RAM IS LOCATED, THE COMPLEMENT OF IT'S REAL ADDRESS
2172 
* IS THEN STORED IN A "LOGICAL" TO "REAL" ADDRESS XLATION
2173 
* TABLE THAT IS BUILT FROM $DFD0 TO $DFDF. FOR EXAMPLE IF
2174 
* THE SYSTEM HAS RAM THAT IS PHYSICALLY LOCATED (WIRED TO
2175 
* RESPOND) AT THE HEX LOCATIONS $0--- THRU $F---....
2176 
*
2177 
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
2178 
* 4K 4K 4K 4K 4K 4K 4K 4K -- 4K 4K 4K 4K -- -- --
2179 
*
2180 
* ....FOR A TOTAL OF 48K OF RAM, THEN THE TRANSLATION TABLE
2181 
* CREATED FROM $DFD0 TO $DFDF WILL CONSIST OF THE FOLLOWING....
2182 
*
2183 
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
2184 
* 0F 0E 0D 0C 0B 0A 09 08 06 05 00 00 04 03 F1 F0
2185 
*
2186 
*
2187 
* HERE WE SEE THE LOGICAL ADDRESSES OF MEMORY FROM $0000-$7FFF
2188 
* HAVE NOT BEEN SELECTED FOR RELOCATION SO THAT THEIR PHYSICAL
2189 
* ADDRESS WILL = THEIR LOGICAL ADDRESS; HOWEVER, THE 4K BLOCK
2190 
* PHYSICALLY AT $9000 WILL HAVE ITS ADDRESS TRANSLATED SO THAT
2191 
* IT WILL LOGICALLY RESPOND AT $8000. LIKEWISE $A,$B, AND $C000
2192 
* WILL BE TRANSLATED TO RESPOND TO $9000,$C000, AND $D000
2193 
* RESPECTIVELY. THE USER SYSTEM WILL LOGICALLY APPEAR TO HAVE
2194 
* MEMORY ADDRESSED AS FOLLOWS....
2195 
*
2196 
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
2197 
* 4K 4K 4K 4K 4K 4K 4K 4K 4K 4K -- -- 4K 4K -- --
2198 
*
2199 
*
2200 
        LDY  #LRARAM   ; POINT TO LOGICAL/REAL ADDR. TABLE
2201 
        STA  13,Y      ; STORE $D--- XLATION FACTOR AT $DFDD
2202 
        CLR  14,Y      ; CLEAR $DFDE
2203 
        LDA  #$F0      ; DESTINED FOR IC8 AN MEM EXPANSION ?
2204 
        STA  15,Y      ; STORE AT $DFDF
2205 
        LDA  #$0C      ; PRESET NUMBER OF BYTES TO CLEAR
2206 
CLRLRT  CLR  A,Y       ; CLEAR $DFDC THRU $DFD0
2207 
        DECA           ; SUB. 1 FROM BYTES LEFT TO CLEAR
2208 
        BPL  CLRLRT    ; CONTINUE IF NOT DONE CLEARING
2209 
FNDRAM  LEAX -$1000,X  ; POINT TO NEXT LOWER 4K OF RAM
2210 
        CMPX #$F0A0    ; TEST FOR DECREMENT PAST ZERO
2211 
        BEQ  FINTAB    ; SKIP IF FINISHED
2212 
        LDU  ,X        ; SAVE DATA AT CURRENT TEST LOCATION
2213 
        LDY  #TSTPAT   ; LOAD TEST DATA PATTERN INTO Y REG.
2214 
        STY  ,X        ; STORE TEST PATT. INTO RAM TEST LOC.
2215 
        CMPY ,X        ; VERIFY RAM AT TEST LOCATION
2216 
        BNE  FNDRAM    ; IF NO RAM GO LOOK 4K LOWER
2217 
        STU  ,X        ; ELSE RESTORE DATA TO TEST LOCATION
2218 
        LDY  #LRARAM   ; POINT TO LOGICAL/REAL ADDR. TABLE
2219 
        TFR  X,D       ; PUT ADDR. OF PRESENT 4K BLOCK IN D
2220 
        LSRA           ; PUT MS 4 BITS OF ADDR. IN LOC. D0-D3
2221 
        LSRA           ; TO ALLOW STORING IT IN THE DAT RAM.
2222 
        LSRA
2223 
        LSRA
2224 
        TFR  A,B       ; SAVE OFFSET INTO LRARAM TABLE
2225 
        EORA #$0F      ; INVERT MSB OF ADDR. OF CURRENT 4K BLK
2226 
        STA  B,Y       ; SAVE TRANSLATION FACTOR IN LRARAM TABLE
2227 
        BRA  FNDRAM    ; GO TRANSLATE ADDR. OF NEXT 4K BLK
2228 
FINTAB  LDA  #$F1      ; DESTINED FOR IC8 AND MEM EXPANSION ?
2229 
        LDY  #LRARAM   ; POINT TO LRARAM TABLE
2230 
        STA  14,Y      ; STORE $F1 AT $DFCE
2231 
*
2232 
* THE FOLLOWING CHECKS TO SEE IF THERE IS A 4K BLK OF
2233 
* RAM LOCATED AT $C000-$CFFF. IF NONE THERE IT LOCATES
2234 
* THE NEXT LOWER 4K BLK AN XLATES ITS ADDR SO IT
2235 
* LOGICALLY RESPONDS TO THE ADDRESS $C---.
2236 
*
2237 
*
2238 
        LDA  #$0C      ; PRESET NUMBER HEX "C"
2239 
FINDC   LDB  A,Y       ; GET ENTRY FROM LRARAM TABLE
2240 
        BNE  FOUNDC    ; BRANCH IF RAM THIS PHYSICAL ADDR.
2241 
        DECA           ; ELSE POINT 4K LOWER
2242 
        BPL  FINDC     ; GO TRY AGAIN
2243 
        BRA  XFERTF
2244 
FOUNDC  CLR  A,Y       ; CLR XLATION FACTOR OF 4K BLOCK FOUND
2245 
        STB  $0C,Y     ; GIVE IT XLATION FACTOR MOVING IT TO $C---
2246 
*
2247 
* THE FOLLOWING CODE ADJUSTS THE TRANSLATION
2248 
* FACTORS SUCH THAT ALL REMAINING RAM WILL
2249 
* RESPOND TO A CONTIGUOUS BLOCK OF LOGICAL
2250 
* ADDRESSES FROM $0000 AND UP....
2251 
*
2252 
        CLRA           ; START AT ZERO
2253 
        TFR  Y,X       ; START POINTER "X" START OF "LRARAM" TABLE.
2254 
COMPRS  LDB  A,Y       ; GET ENTRY FROM "LRARAM" TABLE
2255 
        BEQ  PNTNXT    ; IF IT'S ZER0 SKIP
2256 
        CLR  A,Y       ; ELSE ERASE FROM TABLE
2257 
        STB  ,X+       ; AND ENTER ABOVE LAST ENTRY- BUMP
2258 
PNTNXT  INCA           ; GET OFFSET TO NEXT ENTRY
2259 
        CMPA #$0C      ; LAST ENTRY YET ?
2260 
        BLT  COMPRS
2261 
*
2262 
* THE FOLLOWING CODE TRANSFER THE TRANSLATION
2263 
* FACTORS FROM THE LRARAM TABLE TO IC11 ON
2264 
* THE MP-09 CPU CARD.
2265 
*
2266 
XFERTF  LDX  #IC11     ; POINT TO DAT RAM IC11
2267 
        LDB  #$10      ; GET NO. OF BYTES TO MOVE
2268 
FETCH   LDA  ,Y+       ; GET BYTE AND POINT TO NEXT
2269 
        STA  ,X+       ; POKE XLATION FACTOR IN IC11
2270 
        DECB           ; SUB 1 FROM BYTES TO MOVE
2271 
        BNE  FETCH     ; CONTINUE UNTIL 16 MOVED
2272 
*
2273 59 davidgb 
        ELSE
2274 
LRA     RTS
2275 99 davidgb 
START   LDS  #STACK    ; INITIALIZE STACK POINTER
2276 59 davidgb 
        CLRB
2277 
        ENDIF DATOPT
2278 
*
2279 99 davidgb 
        COMB           ; SET "B" NON-ZERO
2280 
        STB  ECHO      ; TURN ON ECHO FLAG
2281 
        LBRA MONITOR   ; INITIALIZATION IS COMPLETE
2282 
*
2283 59 davidgb 
** INTERRUPT JUMP VECTORS
2284 
*
2285 99 davidgb 
V1      JMP  [STACK]
2286 
V2      JMP  [SWI2]
2287 
V3      JMP  [FIRQ]
2288 
V4      JMP  [IRQ]
2289 
V5      JMP  [SWI]
2290 
*
2291 
* SWI3 ENTRY POINT
2292 
*
2293 
SWI3E   TFR  S,U
2294 
        LDX  10,U      *$FFC8
2295 
        LDB  ,X+
2296 
        STX  10,U
2297 
        CLRA
2298 
        ASLB
2299 
        ROLA
2300 
        LDX  SVCVO
2301 
        CMPX #$FFFF
2302 
        BEQ  SWI3Z
2303 
        LEAX D,X
2304 
        CMPX SVCVL
2305 
        BHI  SWI3Z
2306 
        PSHS X
2307 
        LDD  ,U
2308 
        LDX  4,U
2309 
        JMP  [,S++]
2310 
SWI3Z   PULU A,B,X,CC,DP
2311 
        LDU  2,U
2312 
        JMP  [SWI3]
2313 
*
2314 
* 6809 VECTORS
2315 
*
2316 
        ORG $FFF0
2317 
        FDB V1    USER-V
2318 
        FDB SWI3E SWI3-V
2319 
        FDB V2    SWI2-V
2320 
        FDB V3    FIRQ-V
2321 
        FDB V4    IRQ-V
2322 
        FDB V5    SWI-V
2323 
        FDB V1    NMI-V
2324 
        FDB START RESTART-V
2325 
        END START

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.