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*
* Sector Dump Utility
* For Compact Flash Driver
* for the 6809
* Configured in 8 bit mode
*
* John Kent
* 21 May 2007
*
* Register Equates
*
CF_BASE    EQU $E040
CF_DATA    EQU CF_BASE+0
CF_ERROR   EQU CF_BASE+1 ; read error
CF_FEATURE EQU CF_BASE+1 ; write feature
CF_SECCNT  EQU CF_BASE+2
CF_SECNUM  EQU CF_BASE+3
CF_CYLLO   EQU CF_BASE+4
CF_CYLHI   EQU CF_BASE+5
CF_HEAD    EQU CF_BASE+6
CF_STATUS  EQU CF_BASE+7 ; read status
CF_COMAND  EQU CF_BASE+7 ; write command
*
* Command Equates
*
CMDREAD    EQU $20 ; Read Single sector
CMDWRITE   EQU $30 ; Write Single sector
CMDFEATURE EQU $EF
FEAT8BIT   EQU $01 ; enable 8 bit transfers
HEADLBA    EQU $E0
*
* Status bit equates
*
BUSY       EQU $80
DRDY       EQU $40
DRQ        EQU $08
ERR        EQU $01
*
* Start of Program
*
         ORG $0100
START    LBRA START1
*
* DATA STORAGE
*
SECNUM   FCB $00,$00,$00
CPORT    FDB $E000
ECHO     FCB $FF
*
* SECTOR BUFFER
*
SECBUF   RMB 512
*
* PROGRAM STACK
*
         RMB 64
STACK    EQU *
*
* Initialization
*
START1 LDS #STACK
*
* Clear sector buffer
*
       LDX #SECBUF
       LDY #512
ZEROLP CLR ,X+
       LEAY -1,Y
       BNE ZEROLP
*
* INITIALIZE CF CARD FOR 8 BIT LBA MODE
*
       JSR WAITRDY
       LDA #HEADLBA
       STA CF_HEAD
       JSR WAITRDY
       LDA #FEAT8BIT
       STA CF_FEATURE
       LDA #CMDFEATURE
       STA CF_COMAND
       JSR WAITRDY
*
* DISPLAY TITTLE BANNER
*
       LDX #TTLMSG
       JSR PDATA
*
* COMMAND LOOP
* R - READ
* W - WRITE
* N - NEXT
* P - PREV
* M - MODIFY
* Q - QUIT
*
CMDLP  LDX #CMDMSG
       JSR PDATA
       JSR ECHON
       CMPA #'R'
       BEQ READ
       CMPA #'N'
       BEQ NEXT
       CMPA #'P'
       BEQ PREV
       CMPA #'W'
       LBEQ WRITE
       CMPA #'M'
       BEQ MODIFY
       CMPA #'Q'
       BEQ QUIT
       LDX #WOTMSG
       JSR PSTRNG
       BRA CMDLP
*
* QUIT
*
QUIT   JMP [$F800]
*
* MODIFY SECTOR
*
MODIFY JSR MEMCHG
       BRA CMDLP
*
* NEXT SECTOR (READ)
* INCREMENT SECTOR NUMBER
* WRAPS AROUND TO ZERO ON $FFFFFF
*
NEXT   LDX SECNUM+1
       LEAX 1,X
       STX SECNUM+1
       BNE READS
       INC SECNUM
       BRA READS
*
* PREVIOUS SECTOR (READ)
* DECREMENT SECTOR NUMBER
* DON'T DECREMENT PAST $000000
*
PREV   LDX SECNUM+1
       BNE PREV1
       TST SECNUM
       BEQ READS
       DEC SECNUM
PREV1  LEAX -1,X
       STX SECNUM+1
       BRA READS
*
* READ SECTORS FROM CF
*
READ   LDX #SECPMT
       JSR PSTRNG
       JSR IN6HEX
       BVS RDEXIT
       STB SECNUM
       STX SECNUM+1
*
READS  LDA #$01
       STA CF_SECCNT
       LDA SECNUM+2
       STA CF_SECNUM
       LDA SECNUM+1
       STA CF_CYLLO
       LDA SECNUM+0
       STA CF_CYLHI
*
       LDA #CMDREAD ; IDE READ MULTIPLE
       STA CF_COMAND
       JSR WAITRDY
*
       LDX #SECBUF
       LDY #512
*
* READ LOOP
*
RDLOOP JSR WAITDRQ
       LDA CF_DATA
       STA ,X+
       LEAY -1,Y
       BNE RDLOOP
*
       JSR WAITRDY
       JSR MEMDUMP
RDEXIT JMP CMDLP
*
* WRITE SECTOR TO CF
*
WRITE  LDX #SECPMT
       JSR PSTRNG
       JSR IN6HEX
       BVS WREXIT
       STB SECNUM
       STX SECNUM+1
*
       LDA #$01
       STA CF_SECCNT
       LDA SECNUM+2
       STA CF_SECNUM
       LDA SECNUM+1
       STA CF_CYLLO
       LDA SECNUM+0
       STA CF_CYLHI
*
       LDA #CMDWRITE; IDE WRITE MULTIPLE
       STA CF_COMAND
       JSR WAITRDY
*
       LDX #SECBUF
       LDY #512
*
* WRITE LOOP
*
WRLOOP JSR WAITDRQ
       LDA ,X+
       STA CF_DATA
       LEAY -1,Y
       BNE WRLOOP
*
       JSR WAITRDY
WREXIT JMP CMDLP
*
* WAIT UNTIL READY
*
WAITRDY LDA CF_STATUS
        BITA #BUSY
        BNE WAITRDY
        LDA CF_STATUS
        BITA #DRDY
        BEQ WAITRDY
        RTS
*
* WAIT FOR DATA REQUEST
*
WAITDRQ LDA CF_STATUS
        BITA #DRQ
        BEQ WAITDRQ
        RTS
*
* DUMP SECTOR IN MEMORY
*
MEMDUMP LDX  #SECMSG
        JSR  PSTRNG
        LDA  SECNUM
        JSR  OUT2H
        LDX  SECNUM+1
        JSR  OUT4H
        JSR  PCRLF
        LDY  #$0000
        LEAX #$1FF,Y
*
* ADJUST LOWER AND UPPER ADDRESS LIMITS
* TO EVEN 16 BYTE BOUNDRIES.
*
* IF LOWER ADDR = $4532
* LOWER BOUNDS WILL BE ADJUSTED TO = $4530.
*
* IF UPPER ADDR = $4567
* UPPER BOUNDS WILL BE ADJUSTED TO = $4570.
*
* ENTER WITH LOWER ADDRESS IN X-REG.
*           -UPPER ADDRESS ON TOP OF STACK.
*
AJDUMP  TFR  X,D     GET UPPER ADDR IN D-REG
        ADDD #$10    ADD 16 TO UPPER ADDRESS
        ANDB #$F0    MASK TO EVEN 16 BYTE BOUNDRY
        PSHS A,B     SAVE ON STACK AS UPPER DUMP LIMIT
        TFR  Y,D     $F9A5 GET LOWER ADDRESS IN D-REG
        ANDB #$F0    MASK TO EVEN 16 BYTE BOUNDRY
        TFR  D,X     PUT IN X-REG AS LOWER DUMP LIMIT
NXTLIN  CMPX ,S      COMPARE LOWER TO UPPER LIMIT
        BEQ  SKPDMP  IF EQUAL SKIP HEX-ASCII DUMP
        LBSR INCHEK  CHECK FOR INPUT FROM KEYBOARD
        BEQ  EDUMP
SKPDMP  LEAS 2,S     READJUST STACK IF NOT DUMPING
        RTS          ;
*
* PRINT 16 HEX BYTES FOLLOWED BY 16 ASCII CHARACTERS
* FOR EACH LINE THROUGHOUT ADDRESS LIMITS.
*
EDUMP   PSHS X       PUSH LOWER ADDR LIMIT ON STACK
        LDX  #MSG5   POINT TO MSG " - "
        LBSR PSTRNG  PRINT MSG
        LDX  ,S      LOAD LOWER ADDR FROM TOP OF STACK
        LBSR OUT4H   PRINT THE ADDRESS
        LBSR OUT2S   2 SPACES
        LDB  #$10    LOAD COUNT OF 16 BYTES TO DUMP
ELOOP   LDA  SECBUF,X     GET FROM MEMORY HEX BYTE TO PRINT
        LEAX 1,X
        LBSR OUT2H   OUTPUT HEX BYTE AS ASCII
        LBSR OUT1S   OUTPUT SPACE
        DECB         $F9D1 DECREMENT BYTE COUNT
        BNE  ELOOP   CONTINUE TIL 16 HEX BYTES PRINTED
*
* PRINT 16 ASCII CHARACTERS
* IF NOT PRINTABLE OR NOT VALID
* ASCII PRINT A PERIOD (.)
        LBSR OUT2S   2 SPACES
        LDX  ,S++    GET LOW LIMIT FRM STACK - ADJ STACK
        LDB  #$10    SET ASCII CHAR TO PRINT = 16
EDPASC  LDA  SECBUF,X     GET CHARACTER FROM MEMORY
        LEAX 1,X
        CMPA #$20    IF LESS THAN $20, NON-PRINTABLE?
        BCS  PERIOD  IF SO, PRINT PERIOD INSTEAD
        CMPA #$7E    IS IT VALID ASCII?
        BLS  PRASC   IF SO PRINT IT
PERIOD  LDA  #'.     LOAD A PERIOD (.)
PRASC   LBSR OUTCH   PRINT ASCII CHARACTER
        DECB         DECREMENT COUNT
        BNE  EDPASC
        BRA  NXTLIN
*
*
***** "M" MEMORY EXAMINE AND CHANGE *****
*
* RESTRICT ADDRESSING RANGE TO 512 BYTES ($000 - $1FF)
*
MEMCHG  LDX  #MEMMSG
        JSR  PSTRNG
        LBSR IN3HEX  INPUT ADDRESS
        BVS  CHRTN   IF NOT HEX, RETURN
        CMPX #$0200
        BHS  CHRTN
        TFR  X,Y     SAVE ADDR IN "Y"
MEMC2   LDX  #MSG5   POINT TO MSG " - "
        LBSR PSTRNG  PRINT MSG
        TFR  Y,X     FETCH ADDRESS
        LBSR OUT4H   PRINT ADDR IN HEX
        LBSR OUT1S   OUTPUT SPACE
        LDA  SECBUF,Y GET CONTENTS OF CURRENT ADDR.
        LBSR OUT2H   OUTPUT CONTENTS IN ASCII
        LBSR OUT1S   OUTPUT SPACE
        LBSR BYTE    LOOP WAITING FOR OPERATOR INPUT
        BVC  CHANGE  IF VALID HEX GO CHANGE MEM. LOC.
        CMPA #8      IS IT A BACKSPACE (CNTRL H)?
        BEQ  MEMC2   PROMPT OPERATOR AGAIN
        CMPA #$18    IS IT A CANCEL (CNTRL X)?
        BEQ  MEMC2   PROMPT OPERATOR AGAIN
        CMPA #'^     IS IT AN UP ARROW?
        BEQ  BACK    DISPLAY PREVIOUS BYTE
        CMPA #$D     IS IT A CR?
        BNE  FORWRD  DISPLAY NEXT BYTE
CHRTN   RTS          EXIT ROUTINE
*
*
CHANGE  STA  SECBUF,Y      CHANGE BYTE IN MEMORY
        CMPA SECBUF,Y      DID MEMORY BYTE CHANGE?
        BEQ  FORWRD  $F972
        LBSR OUT1S   OUTPUT SPACE
        LDA  #'?     LOAD QUESTION MARK
        LBSR OUTCH   PRINT IT
FORWRD  CMPY #$01FF
        BEQ  MEMC2
        LEAY 1,Y     POINT TO NEXT HIGHER MEM LOCATION
        BRA  MEMC2   PRINT LOCATION & CONTENTS
BACK    CMPY #$0000
        BEQ  MEMC2
        LEAY -1,Y    POINT TO LAST MEM LOCATION
        BRA  MEMC2   PRINT LOCATION & CONTENTS
*
* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE
* OPERATOR TO INPUT ONE VALID HEX ADDRESS. THE
* ADDRESS IS RETURNED IN THE "X" REGISTER.
*
* IN6HEX - MS BYTE IN ACCB
*          LS WORD IN X REG
*
IN6HEX LEAS -3,S
       BSR  BYTE
       BVS  NOTHEX
       STA  0,S
       BSR  BYTE
       BVS  NOTHEX
       STA  1,S
       BSR  BYTE
       BVS  NOTHEX
       STA  2,S
       CLRA
       PULS B,X,PC
*
* INPUT 3 HEX DIGITS
* RESULT RETURNED IN X
*
IN3HEX BSR INHEX INPUT HEX (1 HEX CHAR)
       BVS NOTHEX EXIT IF NOT VALID HEX
       TFR  D,X
       BSR BYTE INPUT BYTE (2 HEX CHAR)
       BVS NOTHEX
       PSHS X
       STA  1,S
       PULS X,PC
*
***** INPUT BYTE (2 HEX CHAR.) *****
*
BYTE   BSR INHEX GET HEX LEFT
       BVS NOTHEX EXIT IF NOT VALID HEX
       ASLA   ;
       ASLA   ;
       ASLA   ; SHIFT INTO LEFT NIBBLE
       ASLA   ;
       TFR  A,B PUT HEXL IN "B"
       BSR INHEX GET HEX RIGHT
       BVS NOTHEX EXIT IF NOT VALID HEX
       PSHS B PUSH HEXL ON STACK
       ADDA ,S+ ADD HEXL TO HEXR AND ADJ. STK
       RTS  RETURN WITH HEX L&R IN "A"
*
*
INHEX  BSR ECHON INPUT ASCII CHAR.
       CMPA #'0 IS IT > OR = "0" ?
       BCS NOTHEX IF LESS IT AIN'T HEX
       CMPA #'9 IS IT < OR = "9" ?
       BHI INHEXA IF > MAYBE IT'S ALPHA
       SUBA #$30 ASCII ADJ. NUMERIC
       RTS  ;
*
*
INHEXA CMPA #'A IS IT > OR = "A"
       BCS NOTHEX IF LESS IT AIN'T HEX
       CMPA #'F IS IT < OR = "F" ?
       BHI INHEXL IF > IT AIN'T HEX
       SUBA #$37 ASCII ADJ. ALPHA
       RTS  ;
*
INHEXL CMPA #'a IS IT > OR = "a"
       BCS NOTHEX IF LESS IT AIN'T HEX
       CMPA #'f IS IT < "f"
       BHI NOTHEX IF > IT AIN'T HEX
       SUBA #$57 ADJUST TO LOWER CASE
       RTS  ;
*
*
NOTHEX ORCC #2 SET (V) FLAG IN C-CODES REGISTER
       RTS  ;
*
*
OUT4H PSHS X PUSH X-REG. ON THE STACK
       PULS A POP MS BYTE OF X-REG INTO A-ACC.
       BSR OUTHL OUTPUT HEX LEFT
       PULS A POP LS BYTE OF X-REG INTO A-ACC.
OUTHL EQU *
OUT2H PSHS A SAVE IT BACK ON STACK
       LSRA CONVERT UPPER HEX NIBBLE TO ASCII
       LSRA  ;
       LSRA  ;
       LSRA  ;
       BSR XASCII PRINT HEX NIBBLE AS ASCII
OUTHR PULS A CONVERT LOWER HEX NIBBLE TO ASCII
       ANDA #$0F STRIP LEFT NIBBLE
XASCII ADDA #$30 ASCII ADJ
       CMPA #$39 IS IT < OR = "9" ?
       BLE  OUTC IF LESS, OUTPUT IT
       ADDA #7 IF > MAKE ASCII LETTER
OUTC BRA  OUTCH OUTPUT CHAR
*
* BINARY / ASCII --- THIS ROUTINE
* OUTPUTS A BYTE IN ENHANCED
* BINARY FORMAT. THE ENHANCEMENT
* IS DONE BY SUBSTITUTING ASCII
* LETTERS FOR THE ONES IN THE BYTE.
* THE ASCII ENHANCEMENT LETTERS
* ARE OBTAINED FROM THE STRING
* POINTED TO BY THE INDEX REG. "X".
*
BIASCI PSHS A SAVE "A" ON STACK
       LDB  #8 PRESET LOOP# TO BITS PER BYTE
OUTBA LDA ,X+ GET LETTER FROM STRING
       ASL  ,S TEST BYTE FOR "1" IN B7
       BCS PRTBA IF ONE PRINT LETTER
       LDA #'- IF ZERO PRINT "-"
PRTBA BSR OUTCH PRINT IT
       BSR OUT1S PRINT SPACE
       DECB SUB 1 FROM #BITS YET TO PRINT
       BNE OUTBA
       PULS A,PC
*
* PRINT STRING PRECEEDED BY A CR & LF.
*
PSTRNG BSR PCRLF PRINT CR/LF
       BRA  PDATA  PRINT STRING POINTED TO BY IX
*
* PCRLF
*
PCRLF  PSHS X SAVE IX
       LDX  #MSG2+1  POINT TO MSG CR/LF + 3 NULS
       BSR PDATA  PRINT MSG
       PULS X,PC RESTORE IX
PRINT  BSR OUTCH
*
* PDATA
*
PDATA  LDA  ,X+ GET 1st CHAR. TO PRINT
       CMPA #4 IS IT EOT?
       BNE  PRINT IF NOT EOT PRINT IT
       RTS  ;
*
*
ECHON  TST  ECHO IS ECHO REQUIRED ?
       BEQ  INCH ECHO NOT REQ. IF CLEAR
*
* INCHE
*
* ---GETS CHARACTER FROM TERMINAL AND
* ECHOS SAME. THE CHARACTER IS RETURNED
* IN THE "A" ACCUMULATOR WITH THE PARITY
* BIT MASKED OFF. ALL OTHER REGISTERS
* ARE PRESERVED.
*
INCHE  BSR INCH GET CHAR FROM TERMINAL
       ANDA #$7F      STRIP PARITY FROM CHAR.
       BRA  OUTCH     ECHO CHAR TO TERMINAL
*
* INCH
*
* GET CHARACTER FROM TERMINAL. RETURN
* CHARACTER IN "A" ACCUMULATOR AND PRESERVE
* ALL OTHER REGISTERS. THE INPUT CHARACTER
* IS 8 BITS AND IS NOT ECHOED.
*
*
INCH    PSHS X SAVE IX
GETSTA  LDX  CPORT POINT TO TERMINAL PORT
        LDA  ,X  FETCH PORT STATUS
        BITA #1 TEST READY BIT, RDRF ?
        BEQ  GETSTA IF NOT RDY, THEN TRY AGAIN
GETST1  LDA  1,X FETCH CHAR
        PULS X,PC RESTORE IX
*
* INCHEK
*
* CHECK FOR A CHARACTER AVAILABLE FROM
* THE TERMINAL. THE SERIAL PORT IS CHECKED
* FOR READ READY. ALL REGISTERS ARE
* PRESERVED, AND THE "Z" BIT WILL BE
* CLEAR IF A CHARACTER CAN BE READ.
*
*
INCHEK  PSHS A SAVE A ACCUM.
        LDA  [CPORT] FETCH PORT STATUS
        BITA #1 TEST READY BIT, RDRF ?
INCHEK1 PULS A,PC RESTORE A ACCUM.
*
OUT2S   BSR OUT1S OUTPUT 2 SPACES
OUT1S   LDA  #$20  OUTPUT 1 SPACE
*
*
* OUTCH
*
* OUTPUT CHARACTER TO TERMINAL.
* THE CHAR. TO BE OUTPUT IS
* PASSED IN THE A REGISTER.
* ALL REGISTERS ARE PRESERVED.
*
OUTCH   PSHS A,X    SAVE A ACCUM AND IX
        LDX  CPORT  GET ADDR. OF TERMINAL
FETSTA  LDA  ,X     FETCH PORT STATUS
        BITA #2     TEST TDRE, OK TO XMIT ?
        BEQ  FETSTA IF NOT LOOP UNTIL RDY
        PULS A      GET CHAR. FOR XMIT
        STA  1,X    XMIT CHAR.
        PULS X,PC   RESTORE IX
*
*
ACINIZ  LDX  CPORT  POINT TO CONTROL PORT ADDRESS
        LDA  #3     RESET ACIA PORT CODE
        STA  ,X     STORE IN CONTROL REGISTER
        LDA  #$11   SET 8 DATA, 2 STOP AN 0 PARITY
        STA  ,X     STORE IN CONTROL REGISTER
        TST  1,X    ANYTHING IN DATA REGISTER?
        LDA  #$FF   TURN ON ECHO FLAG
        STA  ECHO
        RTS
*
* MESSAGE STRINGS
*
TTLMSG FCB $0A,$0D
       FCC "COMPACT FLASH SECTOR READ/WRITE UTILITY"
       FCB $04
CMDMSG FCB $0A,$0D
       FCC "(R) READ SECTOR"
       FCB $0A,$0D
       FCC "(W) WRITE SECTOR"
       FCB $0A,$0D
       FCC "(N) NEXT SECTOR"
       FCB $0A,$0D
       FCC "(P) PREV SECTOR"
       FCB $0A,$0D
       FCC "(M) MODIFY SECTOR"
       FCB $0A,$0D
       FCC "(Q) QUIT"
       FCB $0A,$0D
       FCC ": "
       FCB $04
SECPMT FCC "SECTOR NUMBER (6 HEX) : "
       FCB $04
SECMSG FCC "SECTOR NUMBER - $"
       FCB $04
MEMMSG FCB $0D,$0A
       FCC "MEMORY ADDRESS (3 HEX): "
       FCB $04
MSG5   FCC " - "
       FCB $04
MSG2   FCB $00,$00,$0A,$0D,$00,$00,$00,$04
WOTMSG FCC "What ?"
       FCB $0D,$0A,$04
*
       END START

Line No.	Rev	Author	Line
1	47	davidgb	`*`
2			`* Sector Dump Utility`
3			`* For Compact Flash Driver`
4			`* for the 6809`
5			`* Configured in 8 bit mode`
6			`*`
7			`* John Kent`
8			`* 21 May 2007`
9			`*`
10			`* Register Equates`
11			`*`
12			`CF_BASE EQU $E040`
13			`CF_DATA EQU CF_BASE+0`
14			`CF_ERROR EQU CF_BASE+1 ; read error`
15			`CF_FEATURE EQU CF_BASE+1 ; write feature`
16			`CF_SECCNT EQU CF_BASE+2`
17			`CF_SECNUM EQU CF_BASE+3`
18			`CF_CYLLO EQU CF_BASE+4`
19			`CF_CYLHI EQU CF_BASE+5`
20			`CF_HEAD EQU CF_BASE+6`
21			`CF_STATUS EQU CF_BASE+7 ; read status`
22			`CF_COMAND EQU CF_BASE+7 ; write command`
23			`*`
24			`* Command Equates`
25			`*`
26			`CMDREAD EQU $20 ; Read Single sector`
27			`CMDWRITE EQU $30 ; Write Single sector`
28			`CMDFEATURE EQU $EF`
29			`FEAT8BIT EQU $01 ; enable 8 bit transfers`
30			`HEADLBA EQU $E0`
31			`*`
32			`* Status bit equates`
33			`*`
34			`BUSY EQU $80`
35			`DRDY EQU $40`
36			`DRQ EQU $08`
37			`ERR EQU $01`
38			`*`
39			`* Start of Program`
40			`*`
41			`ORG $0100`
42			`START LBRA START1`
43			`*`
44			`* DATA STORAGE`
45			`*`
46			`SECNUM FCB $00,$00,$00`
47			`CPORT FDB $E000`
48			`ECHO FCB $FF`
49			`*`
50			`* SECTOR BUFFER`
51			`*`
52			`SECBUF RMB 512`
53			`*`
54			`* PROGRAM STACK`
55			`*`
56			`RMB 64`
57			`STACK EQU *`
58			`*`
59			`* Initialization`
60			`*`
61			`START1 LDS #STACK`
62			`*`
63			`* Clear sector buffer`
64			`*`
65			`LDX #SECBUF`
66			`LDY #512`
67			`ZEROLP CLR ,X+`
68			`LEAY -1,Y`
69			`BNE ZEROLP`
70			`*`
71			`* INITIALIZE CF CARD FOR 8 BIT LBA MODE`
72			`*`
73			`JSR WAITRDY`
74			`LDA #HEADLBA`
75			`STA CF_HEAD`
76			`JSR WAITRDY`
77			`LDA #FEAT8BIT`
78			`STA CF_FEATURE`
79			`LDA #CMDFEATURE`
80			`STA CF_COMAND`
81			`JSR WAITRDY`
82			`*`
83			`* DISPLAY TITTLE BANNER`
84			`*`
85			`LDX #TTLMSG`
86			`JSR PDATA`
87			`*`
88			`* COMMAND LOOP`
89			`* R - READ`
90			`* W - WRITE`
91			`* N - NEXT`
92			`* P - PREV`
93			`* M - MODIFY`
94			`* Q - QUIT`
95			`*`
96			`CMDLP LDX #CMDMSG`
97			`JSR PDATA`
98			`JSR ECHON`
99			`CMPA #'R'`
100			`BEQ READ`
101			`CMPA #'N'`
102			`BEQ NEXT`
103			`CMPA #'P'`
104			`BEQ PREV`
105			`CMPA #'W'`
106			`LBEQ WRITE`
107			`CMPA #'M'`
108			`BEQ MODIFY`
109			`CMPA #'Q'`
110			`BEQ QUIT`
111			`LDX #WOTMSG`
112			`JSR PSTRNG`
113			`BRA CMDLP`
114			`*`
115			`* QUIT`
116			`*`
117			`QUIT JMP [$F800]`
118			`*`
119			`* MODIFY SECTOR`
120			`*`
121			`MODIFY JSR MEMCHG`
122			`BRA CMDLP`
123			`*`
124			`* NEXT SECTOR (READ)`
125			`* INCREMENT SECTOR NUMBER`
126			`* WRAPS AROUND TO ZERO ON $FFFFFF`
127			`*`
128			`NEXT LDX SECNUM+1`
129			`LEAX 1,X`
130			`STX SECNUM+1`
131			`BNE READS`
132			`INC SECNUM`
133			`BRA READS`
134			`*`
135			`* PREVIOUS SECTOR (READ)`
136			`* DECREMENT SECTOR NUMBER`
137			`* DON'T DECREMENT PAST $000000`
138			`*`
139			`PREV LDX SECNUM+1`
140			`BNE PREV1`
141			`TST SECNUM`
142			`BEQ READS`
143			`DEC SECNUM`
144			`PREV1 LEAX -1,X`
145			`STX SECNUM+1`
146			`BRA READS`
147			`*`
148			`* READ SECTORS FROM CF`
149			`*`
150			`READ LDX #SECPMT`
151			`JSR PSTRNG`
152			`JSR IN6HEX`
153			`BVS RDEXIT`
154			`STB SECNUM`
155			`STX SECNUM+1`
156			`*`
157			`READS LDA #$01`
158			`STA CF_SECCNT`
159			`LDA SECNUM+2`
160			`STA CF_SECNUM`
161			`LDA SECNUM+1`
162			`STA CF_CYLLO`
163			`LDA SECNUM+0`
164			`STA CF_CYLHI`
165			`*`
166			`LDA #CMDREAD ; IDE READ MULTIPLE`
167			`STA CF_COMAND`
168			`JSR WAITRDY`
169			`*`
170			`LDX #SECBUF`
171			`LDY #512`
172			`*`
173			`* READ LOOP`
174			`*`
175			`RDLOOP JSR WAITDRQ`
176			`LDA CF_DATA`
177			`STA ,X+`
178			`LEAY -1,Y`
179			`BNE RDLOOP`
180			`*`
181			`JSR WAITRDY`
182			`JSR MEMDUMP`
183			`RDEXIT JMP CMDLP`
184			`*`
185			`* WRITE SECTOR TO CF`
186			`*`
187			`WRITE LDX #SECPMT`
188			`JSR PSTRNG`
189			`JSR IN6HEX`
190			`BVS WREXIT`
191			`STB SECNUM`
192			`STX SECNUM+1`
193			`*`
194			`LDA #$01`
195			`STA CF_SECCNT`
196			`LDA SECNUM+2`
197			`STA CF_SECNUM`
198			`LDA SECNUM+1`
199			`STA CF_CYLLO`
200			`LDA SECNUM+0`
201			`STA CF_CYLHI`
202			`*`
203			`LDA #CMDWRITE; IDE WRITE MULTIPLE`
204			`STA CF_COMAND`
205			`JSR WAITRDY`
206			`*`
207			`LDX #SECBUF`
208			`LDY #512`
209			`*`
210			`* WRITE LOOP`
211			`*`
212			`WRLOOP JSR WAITDRQ`
213			`LDA ,X+`
214			`STA CF_DATA`
215			`LEAY -1,Y`
216			`BNE WRLOOP`
217			`*`
218			`JSR WAITRDY`
219			`WREXIT JMP CMDLP`
220			`*`
221			`* WAIT UNTIL READY`
222			`*`
223			`WAITRDY LDA CF_STATUS`
224			`BITA #BUSY`
225			`BNE WAITRDY`
226			`LDA CF_STATUS`
227			`BITA #DRDY`
228			`BEQ WAITRDY`
229			`RTS`
230			`*`
231			`* WAIT FOR DATA REQUEST`
232			`*`
233			`WAITDRQ LDA CF_STATUS`
234			`BITA #DRQ`
235			`BEQ WAITDRQ`
236			`RTS`
237			`*`
238			`* DUMP SECTOR IN MEMORY`
239			`*`
240			`MEMDUMP LDX #SECMSG`
241			`JSR PSTRNG`
242			`LDA SECNUM`
243			`JSR OUT2H`
244			`LDX SECNUM+1`
245			`JSR OUT4H`
246			`JSR PCRLF`
247			`LDY #$0000`
248			`LEAX #$1FF,Y`
249			`*`
250			`* ADJUST LOWER AND UPPER ADDRESS LIMITS`
251			`* TO EVEN 16 BYTE BOUNDRIES.`
252			`*`
253			`* IF LOWER ADDR = $4532`
254			`* LOWER BOUNDS WILL BE ADJUSTED TO = $4530.`
255			`*`
256			`* IF UPPER ADDR = $4567`
257			`* UPPER BOUNDS WILL BE ADJUSTED TO = $4570.`
258			`*`
259			`* ENTER WITH LOWER ADDRESS IN X-REG.`
260			`* -UPPER ADDRESS ON TOP OF STACK.`
261			`*`
262			`AJDUMP TFR X,D GET UPPER ADDR IN D-REG`
263			`ADDD #$10 ADD 16 TO UPPER ADDRESS`
264			`ANDB #$F0 MASK TO EVEN 16 BYTE BOUNDRY`
265			`PSHS A,B SAVE ON STACK AS UPPER DUMP LIMIT`
266			`TFR Y,D $F9A5 GET LOWER ADDRESS IN D-REG`
267			`ANDB #$F0 MASK TO EVEN 16 BYTE BOUNDRY`
268			`TFR D,X PUT IN X-REG AS LOWER DUMP LIMIT`
269			`NXTLIN CMPX ,S COMPARE LOWER TO UPPER LIMIT`
270			`BEQ SKPDMP IF EQUAL SKIP HEX-ASCII DUMP`
271			`LBSR INCHEK CHECK FOR INPUT FROM KEYBOARD`
272			`BEQ EDUMP`
273			`SKPDMP LEAS 2,S READJUST STACK IF NOT DUMPING`
274			`RTS ;`
275			`*`
276			`* PRINT 16 HEX BYTES FOLLOWED BY 16 ASCII CHARACTERS`
277			`* FOR EACH LINE THROUGHOUT ADDRESS LIMITS.`
278			`*`
279			`EDUMP PSHS X PUSH LOWER ADDR LIMIT ON STACK`
280			`LDX #MSG5 POINT TO MSG " - "`
281			`LBSR PSTRNG PRINT MSG`
282			`LDX ,S LOAD LOWER ADDR FROM TOP OF STACK`
283			`LBSR OUT4H PRINT THE ADDRESS`
284			`LBSR OUT2S 2 SPACES`
285			`LDB #$10 LOAD COUNT OF 16 BYTES TO DUMP`
286			`ELOOP LDA SECBUF,X GET FROM MEMORY HEX BYTE TO PRINT`
287			`LEAX 1,X`
288			`LBSR OUT2H OUTPUT HEX BYTE AS ASCII`
289			`LBSR OUT1S OUTPUT SPACE`
290			`DECB $F9D1 DECREMENT BYTE COUNT`
291			`BNE ELOOP CONTINUE TIL 16 HEX BYTES PRINTED`
292			`*`
293			`* PRINT 16 ASCII CHARACTERS`
294			`* IF NOT PRINTABLE OR NOT VALID`
295			`* ASCII PRINT A PERIOD (.)`
296			`LBSR OUT2S 2 SPACES`
297			`LDX ,S++ GET LOW LIMIT FRM STACK - ADJ STACK`
298			`LDB #$10 SET ASCII CHAR TO PRINT = 16`
299			`EDPASC LDA SECBUF,X GET CHARACTER FROM MEMORY`
300			`LEAX 1,X`
301			`CMPA #$20 IF LESS THAN $20, NON-PRINTABLE?`
302			`BCS PERIOD IF SO, PRINT PERIOD INSTEAD`
303			`CMPA #$7E IS IT VALID ASCII?`
304			`BLS PRASC IF SO PRINT IT`
305			`PERIOD LDA #'. LOAD A PERIOD (.)`
306			`PRASC LBSR OUTCH PRINT ASCII CHARACTER`
307			`DECB DECREMENT COUNT`
308			`BNE EDPASC`
309			`BRA NXTLIN`
310			`*`
311			`*`
312			`*** "M" MEMORY EXAMINE AND CHANGE ***`
313			`*`
314			`* RESTRICT ADDRESSING RANGE TO 512 BYTES ($000 - $1FF)`
315			`*`
316			`MEMCHG LDX #MEMMSG`
317			`JSR PSTRNG`
318			`LBSR IN3HEX INPUT ADDRESS`
319			`BVS CHRTN IF NOT HEX, RETURN`
320			`CMPX #$0200`
321			`BHS CHRTN`
322			`TFR X,Y SAVE ADDR IN "Y"`
323			`MEMC2 LDX #MSG5 POINT TO MSG " - "`
324			`LBSR PSTRNG PRINT MSG`
325			`TFR Y,X FETCH ADDRESS`
326			`LBSR OUT4H PRINT ADDR IN HEX`
327			`LBSR OUT1S OUTPUT SPACE`
328			`LDA SECBUF,Y GET CONTENTS OF CURRENT ADDR.`
329			`LBSR OUT2H OUTPUT CONTENTS IN ASCII`
330			`LBSR OUT1S OUTPUT SPACE`
331			`LBSR BYTE LOOP WAITING FOR OPERATOR INPUT`
332			`BVC CHANGE IF VALID HEX GO CHANGE MEM. LOC.`
333			`CMPA #8 IS IT A BACKSPACE (CNTRL H)?`
334			`BEQ MEMC2 PROMPT OPERATOR AGAIN`
335			`CMPA #$18 IS IT A CANCEL (CNTRL X)?`
336			`BEQ MEMC2 PROMPT OPERATOR AGAIN`
337			`CMPA #'^ IS IT AN UP ARROW?`
338			`BEQ BACK DISPLAY PREVIOUS BYTE`
339			`CMPA #$D IS IT A CR?`
340			`BNE FORWRD DISPLAY NEXT BYTE`
341			`CHRTN RTS EXIT ROUTINE`
342			`*`
343			`*`
344			`CHANGE STA SECBUF,Y CHANGE BYTE IN MEMORY`
345			`CMPA SECBUF,Y DID MEMORY BYTE CHANGE?`
346			`BEQ FORWRD $F972`
347			`LBSR OUT1S OUTPUT SPACE`
348			`LDA #'? LOAD QUESTION MARK`
349			`LBSR OUTCH PRINT IT`
350			`FORWRD CMPY #$01FF`
351			`BEQ MEMC2`
352			`LEAY 1,Y POINT TO NEXT HIGHER MEM LOCATION`
353			`BRA MEMC2 PRINT LOCATION & CONTENTS`
354			`BACK CMPY #$0000`
355			`BEQ MEMC2`
356			`LEAY -1,Y POINT TO LAST MEM LOCATION`
357			`BRA MEMC2 PRINT LOCATION & CONTENTS`
358			`*`
359			`* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE`
360			`* OPERATOR TO INPUT ONE VALID HEX ADDRESS. THE`
361			`* ADDRESS IS RETURNED IN THE "X" REGISTER.`
362			`*`
363			`* IN6HEX - MS BYTE IN ACCB`
364			`* LS WORD IN X REG`
365			`*`
366			`IN6HEX LEAS -3,S`
367			`BSR BYTE`
368			`BVS NOTHEX`
369			`STA 0,S`
370			`BSR BYTE`
371			`BVS NOTHEX`
372			`STA 1,S`
373			`BSR BYTE`
374			`BVS NOTHEX`
375			`STA 2,S`
376			`CLRA`
377			`PULS B,X,PC`
378			`*`
379			`* INPUT 3 HEX DIGITS`
380			`* RESULT RETURNED IN X`
381			`*`
382			`IN3HEX BSR INHEX INPUT HEX (1 HEX CHAR)`
383			`BVS NOTHEX EXIT IF NOT VALID HEX`
384			`TFR D,X`
385			`BSR BYTE INPUT BYTE (2 HEX CHAR)`
386			`BVS NOTHEX`
387			`PSHS X`
388			`STA 1,S`
389			`PULS X,PC`
390			`*`
391			`*** INPUT BYTE (2 HEX CHAR.) ***`
392			`*`
393			`BYTE BSR INHEX GET HEX LEFT`
394			`BVS NOTHEX EXIT IF NOT VALID HEX`
395			`ASLA ;`
396			`ASLA ;`
397			`ASLA ; SHIFT INTO LEFT NIBBLE`
398			`ASLA ;`
399			`TFR A,B PUT HEXL IN "B"`
400			`BSR INHEX GET HEX RIGHT`
401			`BVS NOTHEX EXIT IF NOT VALID HEX`
402			`PSHS B PUSH HEXL ON STACK`
403			`ADDA ,S+ ADD HEXL TO HEXR AND ADJ. STK`
404			`RTS RETURN WITH HEX L&R IN "A"`
405			`*`
406			`*`
407			`INHEX BSR ECHON INPUT ASCII CHAR.`
408			`CMPA #'0 IS IT > OR = "0" ?`
409			`BCS NOTHEX IF LESS IT AIN'T HEX`
410			`CMPA #'9 IS IT < OR = "9" ?`
411			`BHI INHEXA IF > MAYBE IT'S ALPHA`
412			`SUBA #$30 ASCII ADJ. NUMERIC`
413			`RTS ;`
414			`*`
415			`*`
416			`INHEXA CMPA #'A IS IT > OR = "A"`
417			`BCS NOTHEX IF LESS IT AIN'T HEX`
418			`CMPA #'F IS IT < OR = "F" ?`
419			`BHI INHEXL IF > IT AIN'T HEX`
420			`SUBA #$37 ASCII ADJ. ALPHA`
421			`RTS ;`
422			`*`
423			`INHEXL CMPA #'a IS IT > OR = "a"`
424			`BCS NOTHEX IF LESS IT AIN'T HEX`
425			`CMPA #'f IS IT < "f"`
426			`BHI NOTHEX IF > IT AIN'T HEX`
427			`SUBA #$57 ADJUST TO LOWER CASE`
428			`RTS ;`
429			`*`
430			`*`
431			`NOTHEX ORCC #2 SET (V) FLAG IN C-CODES REGISTER`
432			`RTS ;`
433			`*`
434			`*`
435			`OUT4H PSHS X PUSH X-REG. ON THE STACK`
436			`PULS A POP MS BYTE OF X-REG INTO A-ACC.`
437			`BSR OUTHL OUTPUT HEX LEFT`
438			`PULS A POP LS BYTE OF X-REG INTO A-ACC.`
439			`OUTHL EQU *`
440			`OUT2H PSHS A SAVE IT BACK ON STACK`
441			`LSRA CONVERT UPPER HEX NIBBLE TO ASCII`
442			`LSRA ;`
443			`LSRA ;`
444			`LSRA ;`
445			`BSR XASCII PRINT HEX NIBBLE AS ASCII`
446			`OUTHR PULS A CONVERT LOWER HEX NIBBLE TO ASCII`
447			`ANDA #$0F STRIP LEFT NIBBLE`
448			`XASCII ADDA #$30 ASCII ADJ`
449			`CMPA #$39 IS IT < OR = "9" ?`
450			`BLE OUTC IF LESS, OUTPUT IT`
451			`ADDA #7 IF > MAKE ASCII LETTER`
452			`OUTC BRA OUTCH OUTPUT CHAR`
453			`*`
454			`* BINARY / ASCII --- THIS ROUTINE`
455			`* OUTPUTS A BYTE IN ENHANCED`
456			`* BINARY FORMAT. THE ENHANCEMENT`
457			`* IS DONE BY SUBSTITUTING ASCII`
458			`* LETTERS FOR THE ONES IN THE BYTE.`
459			`* THE ASCII ENHANCEMENT LETTERS`
460			`* ARE OBTAINED FROM THE STRING`
461			`* POINTED TO BY THE INDEX REG. "X".`
462			`*`
463			`BIASCI PSHS A SAVE "A" ON STACK`
464			`LDB #8 PRESET LOOP# TO BITS PER BYTE`
465			`OUTBA LDA ,X+ GET LETTER FROM STRING`
466			`ASL ,S TEST BYTE FOR "1" IN B7`
467			`BCS PRTBA IF ONE PRINT LETTER`
468			`LDA #'- IF ZERO PRINT "-"`
469			`PRTBA BSR OUTCH PRINT IT`
470			`BSR OUT1S PRINT SPACE`
471			`DECB SUB 1 FROM #BITS YET TO PRINT`
472			`BNE OUTBA`
473			`PULS A,PC`
474			`*`
475			`* PRINT STRING PRECEEDED BY A CR & LF.`
476			`*`
477			`PSTRNG BSR PCRLF PRINT CR/LF`
478			`BRA PDATA PRINT STRING POINTED TO BY IX`
479			`*`
480			`* PCRLF`
481			`*`
482			`PCRLF PSHS X SAVE IX`
483			`LDX #MSG2+1 POINT TO MSG CR/LF + 3 NULS`
484			`BSR PDATA PRINT MSG`
485			`PULS X,PC RESTORE IX`
486			`PRINT BSR OUTCH`
487			`*`
488			`* PDATA`
489			`*`
490			`PDATA LDA ,X+ GET 1st CHAR. TO PRINT`
491			`CMPA #4 IS IT EOT?`
492			`BNE PRINT IF NOT EOT PRINT IT`
493			`RTS ;`
494			`*`
495			`*`
496			`ECHON TST ECHO IS ECHO REQUIRED ?`
497			`BEQ INCH ECHO NOT REQ. IF CLEAR`
498			`*`
499			`* INCHE`
500			`*`

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