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* NAM SYS09BUG12 SYSTEM09 MONITOR
 OPT l
 PAGE
*
* MONITOR PROGRAM FOR THE SOUTHWEST TECHNICAL
* PRODUCTS MP-09 CPU BOARD AS COMMENTED BY....
*
* ALLEN CLARK            WALLACE WATSON
* 2502 REGAL OAKS LANE   4815 EAST 97th AVE.
* LUTZ, FLA. 33549       TEMPLE TERRACE, FLA. 33617
* PH. 813-977-0347       PH. 813-985-1359
*
* MODIFIED TO SBUG09 VER 1.8 BY:  RANDY JARRETT
*                                 2561 NANTUCKET DR APT. E
*                                 ATLANTA, GA  30345
*                                 PH. 404-320-1043
*
* MODIFIED TO SYS09BUG VER 1.0
* FOR:     SYSTEM09 FPGA SYSTEM
* BY:      JOHN KENT
* DATE:    21ST NOVEMBER 2006
* REMOVED: DISK BOOTS
*          MEMORY TEST
* ADDED:   ADM3A VDU DRIVER
*
* MODIFIED TO SYS09BUG VER 1.1
* FOR:     SYSTEM09 FPGA SYSTEM
* BY:      JOHN KENT
* DATE:    7TH JANUARY 2007
* ADDED:   'U' USER EXTENTION COMMANDS AT $F000
*          CONDITIONAL ASSEMBLY OF FLOPPY BOOTS
*          AND REALTIME CLOCK
*
* MODIFIED TO SYS09BUG VER 1.2
* FOR:     SYSTEM09 FPGA SYSTEM
* BY:      JOHN KENT
* DATE:    21ST MAY 2007
* ADDED:   COMPACT FLASH BOOT TO FPGA VERSION
*          REMOVED PORT REDIRECTION ON PUNCH & LOAD
*
* Modified to SYS09BUG VER 1.3
* FOR:     SYSTEM09 FPGA SYSTEM
* BY:      JOHN KENT
* DATE:    8TH JAN 2008
* ADDED:   CONDITIONALS FOR SPARTAN3E STARTER BOARD
*          WITH ONLY 32K OF RAM
*
* Modified to SYS09BUG VER 1.4
* FOR:     SYSTEM09 FPGA SYSTEM
* BY:      JOHN KENT
* DATE:    3RD FEB 2008
* ADDED:   CONDITIONALS FOR XESS BOARD WITH IDE
*          SEPERATE CONDITIONAL FOR S3 STARTER AND B5-X300
*          16 BIT IDE DISK BOOT STRAP ROUTINE
* CHANGED: SEPARARTED OPTIONS EQUATES AND BODY INTO SEPARATE FILES
*
*       *** COMMANDS ***
*
* CONTROL A   = ALTER THE "A" ACCUMULATOR
* CONTROL B   = ALTER THE "B" ACCUMULATOR
* CONTROL C   = ALTER THE CONDITION CODE REGISTER
* CONTROL D   = ALTER THE DIRECT PAGE REGISTER
* CONTROL P   = ALTER THE PROGRAM COUNTER
* CONTROL U   = ALTER USER STACK POINTER
* CONTROL X   = ALTER "X" INDEX REGISTER
* CONTROL Y   = ALTER "Y" INDEX REGISTER
* B hhhh      = SET BREAKPOINT AT LOCATION $hhhh
* D           = 5.25" MINIFLOPPY BOOT
* E ssss-eeee = EXAMINE MEMORY
*               FROM STARTING ADDRESS ssss
*               TO ENDING ADDRESS eeee.
* G           = CONTINUE EXECUTION FROM BREAKPOINT OR SWI
* L           = LOAD TAPE
* M hhhh      = EXAMINE AND CHANGE MEMORY LOCATION hhhh
* P ssss-eeee = PUNCH TAPE, START ssss TO END eeee ADDR.
* R           = DISPLAY REGISTER CONTENTS
* S           = DISPLAY STACK FROM ssss TO $DFC0
* U           = 8" DMAF2 FLOPPY BOOT
* U           = USER EXTENSION COMMANDS AT $F000
* X           = REMOVE ALL BREAKPOINTS
*
*
***************************************************
*   SYS09BUG VARIABLE SPACE
***************************************************
*
        ORG   MONRAM
STACK   EQU   *  TOP OF INTERNAL STACK
NMI     RMB   2  USER NMI VECTOR
SWI3    RMB   2  SOFTWARE INTERRUPT VECTOR #3
SWI2    RMB   2  SOFTWARE INTERRUPT VECTOR #2
FIRQ    RMB   2  FAST INTERRUPT VECTOR
IRQ     RMB   2  INTERRUPT VECTOR
SWI     RMB   2  SOFTWARE INTERRUPT VECTOR
SVCVO   RMB   2  SUPERVISOR CALL VECTOR ORGIN
SVCVL   RMB   2  SUPERVISOR CALL VECTOR LIMIT
        IFD DATOPT
LRARAM  RMB   16 LRA ADDRESSES
        ENDIF DATOPT
CPORT   RMB   2  RE-VECTORABLE CONTROL PORT
ECHO    RMB   1  ECHO FLAG
BPTBL   RMB   24 BREAKPOINT TABLE BASE ADDR
        IFD  TRAOPT
NMISAV  RMB 2 NMI Jump Vector Backup
TRACNT  RMB 2 Trace Count
        ENDIF TRAOPT
        IFD VDUOPT
*
**************************************************
*   VDU8 DISPLAY DRIVER VARIABLES                                    *
**************************************************
*
**** ALWAYS KEEP COLADX AND ROWADX TOGETHER ******
COLADX  RMB   1         CURSOR COLUMN
ROWADX  RMB   1         CURSOR ROW
**************************************************
*
NEWROW  RMB   1         NEW ROW TEMP FOR ESCAPE
ESCFLG  RMB   1         ESCAPE SEQUENCE ACTIVE
        ENDIF VDUOPT
       IFD DG640OPT
*
***************************************************
*   DG640 MEMORY MAPPED DISPLAY DRIVER VARIABLES  *
***************************************************
*
***** ALWAYS KEEP THESE TWO BYTES TOGETHER *****
COLADX  RMB   1           CURSOR COLUMN
ROWADX  RMB   1           CURSOR ROW
*************************************************
CURSOR  RMB   2           ABSOLUTE SCREEN ADDRESS
NEWROW  RMB   1           NEW ROW TEMP FOR ESCAPE
ESCFLG  RMB   1           ESCAPE SEQUENCE ACTIVE
        ENDIF DG640OPT
*
*
***************************************************
*   START OF ROM                                  *
***************************************************
*
        ORG   MONROM
        FDB   MONITOR
        FDB   NEXTCMD
        FDB   INCH
        FDB   INCHE
        FDB   INCHEK
        FDB   OUTCH
        FDB   PDATA
        FDB   PCRLF
        FDB   PSTRNG
        FDB   LRA
*
        IFD ADSOPT
        FDB PCHK  CHECK FOR PRINTER INPUT
        FDB PINIZ INITIATE PRINTER
        FDB POUTCH OUTPUT CH. TO PRINTER
        FDB VINIZ
        FDB VOUTCH
        FDB ACINIZ
        FDB AOUTCH
        ENDIF ADSOPT
*
* MONITOR
*
* VECTOR ADDRESS STRING IS.....
* $F8A1-$F8A1-$F8A1-$F8A1-$F8A1-$FAB0-$FFFF-$FFFF
*
MONITOR LDX   #RAMVEC POINT TO VECTOR ADDR. STRING
        LDY   #STACK  POINT TO RAM VECTOR LOCATION
        LDB   #$10    BYTES TO MOVE = 16
LOOPA   LDA   ,X+     GET VECTOR BYTE
        STA   ,Y+     PUT VECTORS IN RAM / $DFC0-$DFCF
        DECB          SUBTRACT 1 FROM NUMBER OF BYTES TO MOVE
        BNE   LOOPA   CONTINUE UNTIL ALL VECTORS MOVED
*
* CONTENTS     FROM         TO      FUNCTION
*  $F8A1       $FE40      $DFC0     USER-V
*  $F8A1       $FE42      $DFC2     SWI3-V
*  $F8A1       $FE44      $DFC4     SWI2-V
*  $F8A1       $FE46      $DFC6     FIRQ-V
*  $F8A1       $FE48      $DFC8     IRQ-V
*  $FAB0       $FE4A      $DFCA     SWI-V
*  $FFFF       $FE4C      $DFCC     SVC-VO
*  $FFFF       $FE4E      $DFCE     SVC-VL
*
        LDX  #ACIAS
        STX  CPORT    STORE ADDR. IN RAM
        LBSR XBKPNT   CLEAR OUTSTANDING BREAKPOINTS
        LDB  #12      CLEAR 12 BYTES ON STACK
CLRSTK  CLR  ,-S
        DECB
        BNE  CLRSTK
        LEAX MONITOR,PCR  SET PC TO SBUG-E ENTRY
        STX  10,S    ON STACK
        LDA  #$D0    PRESET CONDITION CODES ON STACK
        STA  ,S
        TFR  S,U
        LBSR IOINIZ  INITIALIZE CONTROL PORT
        LDX  #MSG1   POINT TO MONITOR MESSAGE
        LBSR PDATA   PRINT MSG
*
        IFD DATOPT
        LDX  #LRARAM POINT TO LRA RAM STORAGE AREA
        CLRA START   TOTAL AT ZERO
        LDB  #13     TOTAL UP ALL ACTIVE RAM MEMORY
FNDREL  TST  B,X     TEST FOR RAM AT NEXT LOC.
        BEQ  RELPAS  IF NO RAM GO TO NEXT LOC.
        ADDA #4      ELSE ADD 4K TO TOTAL
        DAA          ADJ. TOTAL FOR DECIMAL
RELPAS  DECB         SUB. 1 FROM LOCS. TO TEST
        BPL  FNDREL  PRINT TOTAL OF RAM
        LBSR OUT2H   OUTPUT HEX BYTE AS ASCII
        LDX  #MSG2   POINT TO MSG 'K' CR/LF + 3 NULS
        LBSR PDATA   PRINT MSG
        ENDIF DATOPT
*
        IFD TRAOPT
        LBSR TRAINZ
        ENDIF TRAOPT
*
***** NEXTCMD *****
*
NEXTCMD LDX  #MSG3   POINT TO MSG ">"
        LBSR PSTRNG  PRINT MSG
        LBSR INCH    GET ONE CHAR. FROM TERMINAL
        ANDA #$7F    STRIP PARITY FROM CHAR.
        CMPA #$0D    IS IT CARRIAGE RETURN ?
        BEQ  NEXTCMD IF CR THEN GET ANOTHER CHAR.
        TFR  A,B     PUT CHAR. IN "B" ACCUM.
        CMPA #$20    IS IT CONTROL OR DATA CHAR ?
        BGE  PRTCMD  IF CMD CHAR IS DATA, PRNT IT
        LDA  #'^     ELSE CNTRL CHAR CMD SO...
        LBSR OUTCH   PRINT "^"
        TFR  B,A     RECALL CNTRL CMD CHAR
        ADDA #$40    CONVERT IT TO ASCII LETTER
PRTCMD  LBSR OUTCH   PRNT CMD CHAR
        LBSR OUT1S   PRNT SPACE
        CMPB #$60
        BLE  NXTCH0
        SUBB #$20
*
***** DO TABLE LOOKUP *****
*   FOR COMMAND FUNCTIONS
*
NXTCH0  LDX  #JMPTAB POINT TO JUMP TABLE
NXTCHR  CMPB ,X+     DOES COMMAND MATCH TABLE ENTRY ?
        BEQ  JMPCMD  BRANCH IF MATCH FOUND
        LEAX 2,X     POINT TO NEXT ENTRY IN TABLE
        CMPX #TABEND REACHED END OF TABLE YET ?
        BNE  NXTCHR  IF NOT END, CHECK NEXT ENTRY
        LDX  #MSG4   POINT TO MSG "WHAT?"
        LBSR PDATA   PRINT MSG
        BRA  NEXTCMD IF NO MATCH, PRMPT FOR NEW CMD
JMPCMD  JSR  [,X]    JUMP TO COMMAND ROUTINE
        BRA  NEXTCMD PROMPT FOR NEW COMMAND
*
* "G" GO OR CONTINUE
*
GO      TFR  U,S
RTI     RTI
*
***** "M" MEMORY EXAMINE AND CHANGE *****
*
MEMCHG  LBSR IN1ADR  INPUT ADDRESS
        BVS  CHRTN   IF NOT HEX, RETURN
        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  ,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  ,Y      CHANGE BYTE IN MEMORY
        CMPA ,Y      DID MEMORY BYTE CHANGE?
        BEQ  FORWRD  $F972
        LBSR OUT1S   OUTPUT SPACE
        LDA  #'?     LOAD QUESTION MARK
        LBSR OUTCH   PRINT IT
FORWRD  LEAY 1,Y     POINT TO NEXT HIGHER MEM LOCATION
        BRA  MEMC2   PRINT LOCATION & CONTENTS
BACK    LEAY -1,Y    POINT TO LAST MEM LOCATION
        BRA  MEMC2   PRINT LOCATION & CONTENTS
*
* "S" DISPLAY STACK
* HEX-ASCII DISPLAY OF CURRENT STACK CONTENTS FROM
** CURRENT STACK POINTER TO INTERNAL STACK LIMIT.
*
DISSTK  LBSR PRTSP   PRINT CURRENT STACK POINTER
        TFR  U,Y
        LDX  #STACK  LOAD INTERNAL STACK AS UPPER LIMIT
        LEAX -1,X    POINT TO CURRENT STACK
        BRA  MDUMP1  ENTER MEMORY DUMP OF STACK CONTENTS
*
* "E" DUMP MEMORY FOR EXAMINE IN HEX AND ASCII
* AFTER CALLING 'IN2ADR' LOWER ADDRESS IN Y-REG.
*                        UPPER ADDRESS IN X-REG.
* IF HEX ADDRESSES ARE INVALID (V)=1.
*
MEMDUMP LBSR IN2ADR  INPUT ADDRESS BOUNDRIES
        BVS  EDPRTN  NEW COMMAND IF ILLEGAL HEX
MDUMP1  PSHS Y       COMPARE LOWER TO UPPER BOUNDS
        CMPX ,S++    LOWER BOUNDS > UPPER BOUNDS?
        BCC  AJDUMP  IF NOT, DUMP HEX AND ASCII
EDPRTN  RTS ;
*
* 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  ,X+     GET FROM MEMORY HEX BYTE TO PRINT
        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  ,X+     GET CHARACTER FROM MEMORY
        CMPA #$20    IF LESS THAN $20, NON-PRINTABLE?
        BCS  PERIOD  IF SO, PRINT PERIOD INSTEAD
        CMPA #$7E    IS IT VALID ASCII?
        BLS  PRASC   IF SO PRINT IT
PERIOD  LDA  #'.     LOAD A PERIOD (.)
PRASC   LBSR OUTCH   PRINT ASCII CHARACTER
        DECB         DECREMENT COUNT
        BNE  EDPASC
        BRA  NXTLIN
*
***** "B" SET BREAKPOINT *****
*
BRKPNT  LBSR IN1ADR  GET BREAKPOINT ADDRESS
        BVS  EXITBP  EXIT IF INVALID HEX ADDR.
        CMPX #STACK  ADDRESS ILLEGAL IF >=$DFC0
        BCC  BPERR   IF ERROR PRINT (?), EXIT
        PSHS X       $FA82 PUSH BP ADDRESS ON STACK
        LDX  #$FFFF  LOAD DUMMY ADDR TO TEST BP TABLE
        BSR BPTEST   TEST BP TABLE FOR FREE SPACE
        PULS X       POP BP ADDRESS FROM STACK
        BEQ  BPERR   (Z) SET, OUT OF BP TABLE SPACE
        LDA  ,X      GET DATA AT BREAKPOINT ADDRESS
        CMPA #$3F    IS IT A SWI?
        BEQ  BPERR   IF SWI ALREADY, INDICATE ERROR
        STA  ,Y+     SAVE DATA BYTE IN BP TABLE
        STX  ,Y      SAVE BP ADDRESS IN BP TABLE
        LDA  #$3F    LOAD A SWI ($3F)
        STA  ,X      SAVE SWI AT BREAKPOINT ADDRESS
EXITBP  RTS ;
*
*  INDICATE ERROR SETTING BREAKPOINT
*
BPERR   LBSR OUT1S   OUTPUT SPACE
        LDA  #'?     LOAD (?), INDICATE BREAKPOINT ERROR
        LBRA OUTCH   PRINT "?"
*
*** "X" CLEAR OUTSTANDING BREAKPOINTS ***
*
XBKPNT  LDY  #BPTBL  POINT TO BREAKPOINT TABLE
        LDB  #8      LOAD BREAKPOINT COUNTER
XBPLP   BSR  RPLSWI  REMOVE USED ENTRY IN BP TABLE
        DECB  $FAAC  DECREMENT BP COUNTER
        BNE  XBPLP   END OF BREAKPOINT TABLE?
        RTS
*
***** SWI ENTRY POINT *****
*
SWIE    TFR  S,U     TRANSFER STACK TO USER POINTER
        LDX  10,U    LOAD PC FROM STACK INTO X-REG
        LEAX -1,X    ADJUST ADDR DOWN 1 BYTE.
        BSR  BPTEST  FIND BREAKPOINT IN BP TABLE
        BEQ  REGPR   IF FOUND, REPLACE DATA AT BP ADDR
        STX  10,U    SAVE BREAKPOINT ADDR IN STACK
        BSR  RPLSWI  GO REPLACE SWI WITH ORIGINAL DATA
REGPR   LBSR REGSTR  GO PRINT REGISTERS
*
        IFD TRAOPT
        LDX #0
        STX TRACNT
        ENDIF TRAOPT
*
        LBRA NEXTCMD GET NEXT COMMAND
*
RPLSWI  LDX  1,Y     LOAD BP ADDRESS FROM BP TABLE
        CMPX #STACK  COMPARE TO TOP AVAILABLE USER MEMORY
        BCC  FFSTBL  GO RESET TABLE ENTRY TO $FF'S
        LDA  ,X      GET DATA FROM BP ADDRESS
        CMPA #$3F    IS IT SWI?
        BNE  FFSTBL  IF NOT, RESET TABLE ENTRY TO $FF'S
        LDA  ,Y      GET ORIGINAL DATA FROM BP TABLE
        STA  ,X      $FAD3 RESTORE DATA AT BP ADDRESS
FFSTBL  LDA  #$FF    LOAD $FF IN A-ACC
        STA  ,Y+     RESET BREAKPOINT TABLE DATA TO $FF'S
        STA  ,Y+     RESET BREAKPOINT TABLE ADDR TO $FF'S
        STA  ,Y+
        RTS
*
** SEARCH BREAKPOINT TABLE FOR MATCH **
*
BPTEST  LDY  #BPTBL  POINT TO BREAKPOINT TABLE
        LDB  #8      LOAD BREAKPOINT COUNTER
FNDBP   LDA  ,Y+     LOAD DATA BYTE
        CMPX ,Y++    COMPARE ADDRESS, IS IT SAME?
        BEQ  BPADJ   IF SO, ADJUST POINTER FOR TABLE ENTRY
        DECB         IF NOT, DECREMENT BREAKPOINT COUNTER
        BNE  FNDBP   AND LOOK FOR NEXT POSSIBLE MATCH
        RTS ;
*
*
BPADJ   LEAY -3,Y    MOVE POINTER TO BEGIN OF BP ENTRY
        RTS
*
        IFD TRAOPT
*
** TRACE from address AAAA BB bytes
*
TRACE   LBSR ALTPC1 SET UP NEW PC
        BVS TREXIT ADDRESS ERROR, EXIT
        LBSR OUT1S
        LBSR IN1ADR Fetch Byte Count
        BVS TREXIT Byte Count error, EXIT
        STX TRACNT
*
        LDX NMI Save NMI Vector
        STX NMISAV
        LDX #NMIE Set up NMI for Tracing
        STX NMI
        LBSR TRAINZ   Initialise Hardware
        BRA TRACEG    Start Trace
TREXIT  RTS
*
* CRA0 = 0 CA1 IRQ DISAB, CRA0 = 1 CA1 IRQ ENAB
* CRA1 = 1 CA1 Rising edge IRQ
* CRA2 = 0 TADATA = Data Direction, CRA2 = 1 TADATA = I/O Register
* CRA3 = 0 CA2 = 0 output, CRA3 = 1 CA2 = 1
* CRA4 = 1 ] CA2 = Set/Reset output
* CRA5 = 1 ]
* CRA6 = X CA2 Input Interrupt Flag
* CRA7 = X CA1 Interrupt Flag
*
* CRB0 = 0 CB1 IRQ DISAB, CRB0 = 1 CA1 IRQ ENAB
* CRB1 = 1 CB1 Rising edge IRQ
* CRB2 = 0 TBDATA = Data Direction, CRB2 = 1 TBDATA = I/O Register
* CRB3 = 0 CB2 = 0 output, CRB3 = 1 CB2 = 1
* CRB4 = 1 ] CB2 = Set/Reset output
* CRB5 = 1 ]
* CRB6 = X CB2 Input Interrupt Flag
* CRB7 = X CB1 Interrupt Flag
*
*
** TRACE NMI ENTRY POINT
*
NMIE    TFR S,U
        LDA #$36         Disable Interrupt, CA2 Low
        STA TACTRL
        LDA TADATA       Clear Interrupt flag by reading data port
*
        LBSR REGSTR       DUMP REGISTERS
*
        LDX 10,U         TEST IF NEXT INSTRUCTION IS A SWI
        LDA ,X
        CMPA #$3F
        BEQ TRACEX       EXIT ON SWI
*
        LDX TRACNT       CHECK IF TRACE COUNT EXPIRED
        BEQ TRACEX       YES, GO BACK TO THE MONITOR
        LEAX -1,X        DECREMENT TRACE COUNT
        STX TRACNT
*
**  TRACE GO (RESUME SINGLE STEP)
*
TRACEG  TFR U,S          SET UP PROGRAM STACK POINTER
        LDA #TRADEL      SET UP TIMER DELAY (NUMB CYCLES FOR RTI+1)
        STA TADATA
        LDA #$36         LOAD STROBE LOW
        STA TACTRL
        LDA TADATA       CLEAR INTERRUPT
        LDA #$36         RELEASE RESET
        STA TBCTRL
        LDA #$3F         RELEASE LOAD, ENABLE CA1 NMI, CA1 RISING EDGE
        STA TACTRL
        RTI              GO EXECUTE INSTRUCTION
*
TRACEX  LDX NMISAV       Restore NMI vector
        STX NMI
        LBRA NEXTCMD     Jump back to the command loop.
*
** TRACE HARDWARE INITIALISATION
*
TRAINZ  LDA #$32         SELECT DDRA, CA2 LOW, NMI DISABLED
        STA TACTRL
        LDA #$3A         SELECT DDRB, CB2 HIGH, FIRQ DISABLED
        STA TBCTRL
        LDA #$FF         PORTA = OUTPUT
        STA TADATA
        LDA #$00         PORTB = INPUT
        STA TBDATA
        LDA #$36         SELECT OUTPUT REGISTER A, CA2 LOW
        STA TACTRL
        LDA #$3E         SELECT OUTPUT REGISTER B, CB2 HIGH
        STA TBCTRL
        RTS
*
        ENDIF TRAOPT
        IFD  MFDCOPT
*
** "U" MINI DISK BOOT
*
MINBOOT TST  CMDFDC
        CLR  DRVFDC
        LDX  #$0000
LOOP    LEAX $01,X
        CMPX #$0000
        BNE  LOOP
        LDA  #$0F
        STA  CMDFDC
        BSR  DELAY
LOOP1   LDB  CMDFDC
        BITB #$01
        BNE  LOOP1
        LDA  #$01
        STA  SECFDC
        BSR  DELAY
        LDA  #$8C
        STA  CMDFDC
        BSR  DELAY
        LDX  #$C000
        BRA  LOOP3
LOOP2   BITB #$02
        BEQ  LOOP3
        LDA  DATFDC
        STA ,X+
LOOP3   LDB  CMDFDC
        BITB #$01
        BNE  LOOP2
        BITB #$2C
        BEQ  LOOP4
        RTS
*
LOOP4   LDX  #$C000
        STX  $0A,U
        TFR  U,S
        RTI
*
DELAY   LDB  #$04
LOOP5   DECB
        BNE  LOOP5
        RTS
        ENDIF MFDCOPT
*
        IFD  DMAFOPT
*
*** "D" DISK BOOT FOR DMAF2 ***
*
DBOOT   LDA  #$DE
        STA  DRVREG
        LDA  #$FF
        STA  PRIREG     $FAF8
        STA  CCREG
        STA  AAAREG
        STA  BBBREG
        TST  CCREG
        LDA  #$D8
        STA  COMREG
        LBSR DLY
DBOOT0  LDA  COMREG
        BMI  DBOOT0
        LDA  #$09
        STA  COMREG
        LBSR DLY
*
DISKWT  LDA  COMREG FETCH DRIVE STATUS
        BITA #1 TEST BUSY BIT
        BNE  DISKWT LOOP UNTIL NOT BUSY
*
        BITA #$10
        BNE  DBOOT
*
        LDX  #$C000 LOGICAL ADDR. = $C000
        BSR LRA  GET 20 BIT PHYSICAL ADDR. OF LOG. ADDR.
        ORA  #$10
        STA  CCCREG
        TFR  X,D
        COMA  ;
        COMB  ;
        STD  ADDREG
        LDX  #$FEFF LOAD DMA BYTE COUNT = $100
        STX  CNTREG STORE IN COUNT REGISTER
        LDA  #$FF LOAD THE CHANNEL REGISTER
        STA  CCREG
        LDA  #$FE SET CHANNEL 0
        STA  PRIREG
        LDA  #1 SET SECTOR TO "1"
        STA  SECREG ISSUE COMMAND
        LDA  #$8C SET SINGLE SECTOR READ
        STA  COMREG ISSUE COMMAND
        BSR DLY
*
* THE FOLLOWING CODE TESTS THE STATUS OF THE
* CHANNEL CONTROL REGISTER. IF "D7" IS NOT
* ZERO THEN IT WILL LOOP WAITING FOR "D7"
* TO GO TO ZERO. IF AFTER 65,536 TRIES IT
* IS STILL A ONE THE BOOT OPERATION WILL
* BE STARTED OVER FROM THE BEGINING.
*
        CLRB  ;
DBOOT1  PSHS B     $FB55
        CLRB  ;
DBOOT2  TST  CCREG
        BPL  DBOOT3
        DECB  ;
        BNE  DBOOT2
        PULS B
        DECB
        BNE  DBOOT1
        BRA  DBOOT
DBOOT3  PULS B
        LDA  COMREG
        BITA #$1C
        BEQ  DBOOT4
        RTS  ;
*
*
DBOOT4  LDB  #$DE
        STB  DRVREG
        LDX  #$C000
        STX  10,U
        TFR  U,S    $FB7B
        RTI  ;
        ENDIF DMAFOPT
*
        IFD CF8OPT
*
* COMPACT FLASH BOOT
*
CFBOOT  BSR  WAITRDY
        LDA  #HEADLBA
        STA  CF_HEAD
        BSR  WAITRDY
        LDA  #FEAT8BIT
        STA  CF_FEATURE
        LDA  #CMDFEATURE
        STA  CF_COMAND
        BSR  WAITRDY
*
* READ SECTORS FROM CF
*
CFREAD  LDA  #$01
        STA  CF_SECCNT
        CLRA
        STA  CF_SECNUM
        STA  CF_CYLLO
        STA  CF_CYLHI
*
        LDA  #CMDREAD ; IDE READ MULTIPLE
        STA  CF_COMAND
        BSR  WAITRDY
        LDX  #$C000
*
* READ LOOP
*
RDLOOP  BSR  WAITDRQ
        LDA  CF_DATA
        STA  ,X+
        CMPX #$C200
        BNE  RDLOOP
*
        LDX  #$C000
        STX  $0A,U
        TFR  U,S
        RTI
*
* 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
        ENDIF CF8OPT
*
        IFD IDEOPT
*
* XESS 16 BIT IDE BOOT
*
IDEBOOT LDD  #AUXRESET
        STD  CF_AUX
        LDD #AUXRSTREL
        STD CF_AUX
        LDD  #HEADLBA
        STD  CF_HEAD
        BSR  WAITRDY
*
* READ SECTORS FROM CF
*
        LDD  #$01
        STD  CF_SECCNT
        CLRB
        STD  CF_SECNUM
        STD  CF_CYLLO
        STD  CF_CYLHI
*
        LDB  #CMDREAD ; IDE READ MULTIPLE
        STD  CF_COMAND
        BSR  WAITRDY
        LDX  #$C000
*
* READ LOOP
*
RDLOOP  BSR  WAITDRQ
        LDD  CF_DATA
        STB  ,X+
        CMPX #$C100
        BNE  RDLOOP
*
        LDX  #$C000
        STX  $0A,U
        TFR  U,S
        RTI
*
* WAIT UNTIL READY
*
WAITRDY LDD  CF_STATUS
        BITB #BUSY
        BNE  WAITRDY
        LDD  CF_STATUS
        BITB #DRDY
        BEQ  WAITRDY
        RTS
*
* WAIT FOR DATA REQUEST
*
WAITDRQ LDD  CF_STATUS
        BITB #DRQ
        BEQ  WAITDRQ
        RTS
        ENDIF IDEOPT
*
        IFD RTCOPT
*
* CLOCK INTER FACE UTILITY
*
* TIME   
* If no argument is specified, the current time
* will be displayed.
*
* READ A REGISTER FROM THE COUNTER.
* The X Index rgister points to the register
* to be read. The Status Register is checked
* before and after the register is read before
* returning a value in accumulator A
*
RDCLK  TST CLKSTA
       BNE RDCLK
RDCLK1 LDA 0,X
       TST CLKSTA
       BNE RDCLK1
       RTS
*
* MAIN PROGRAM:
*
TIMSET LDX #COUNTR POINT TO TIMER
      LBSR BYTE READ HOURS
      BVS  SHOWTM NO ARG, DISP TIME
      STA HOUR,X
      LBSR OUT1S
      LBSR BYTE READ MINUITES
      BVS  SHOWTM
      STA MINUIT,X
      LBSR OUT1S
      LBSR BYTE SECONDS.
      BVS SHOWTM
      STA SECOND,X
*
* DISPLAY CURRENT TIME
*
SHOWTM LBSR PCRLF
       LDX #COUNTR+HOUR
       LDB #3
SHOWLP BSR RDCLK
       LBSR OUT2H
       LDA #':
       LBSR OUTCH
       LEAX -1,X
       DECB
       BNE SHOWLP
       RTS
*
* INITIATE CLOCK.
* MASK INTERRUPTS.
*
CLKINZ CLR CINTCR  MASK ALL INTERRUPTS
       TST CINTSR  CLEAR ANY INTERRUPTS
       RTS
       ENDIF RTCOPT
       IFD DATOPT
*
***** LRA LOAD REAL ADDRESS *****
*
* THE FOLLOWING CODE LOADS THE 20-BIT
* PHYSICAL ADDRESS OF A MEMORY BYTE
* INTO THE "A" AND "X" REGISTERS. THIS
* ROUTINE IS ENTERED WITH THE LOGICAL
* ADDRESS OF A MEMORY BYTE IN THE "IX"
* REGISTER. EXIT IS MADE WITH THE HIGH-
* ORDER FOUR BITS OF THE 20-BIT PHYSICAL
* ADDRESS IN THE "A" REGISTER, AND THE
* LOW-ORDER 16-BITS OF THE 20-BIT
* PHYSICAL ADDRESS IN THE "IX" REGISTER.
* ALL OTHER REGISTERS ARE PRESERVED.
* THIS ROUTINE IS REQUIRED SINCE THE
* DMAF1 AND DMAF2 DISK CONTROLLERS MUST
* PRESENT PHYSICAL ADDRESSES ON THE
* SYSTEM BUS.
*
LRA     PSHS A,B,X,Y PUSH REGISTERS ON STACK
        LDA  2,S     GET MSB LOGICAL ADDR FRM X REG ON STACK
        LSRA         ;
        LSRA         ADJ FOR INDEXED INTO
        LSRA         CORRESPONDING LOCATION
        LSRA         IN LRA TABLE
        LDY  #LRARAM LOAD LRA TABLE BASE ADDRESS
        LDB  A,Y     GET PHYSICAL ADDR. DATA FROM LRA TABLE
        LSRB         ADJ. REAL ADDR. TO REFLECT EXTENDED
        LSRB         PHYSICAL ADDRESS.
        LSRB         EXTENDED MS 4-BITS ARE RETURNED
        LSRB         IN THE "A" ACCUMULATOR
        STB  ,S      MS 4 BITS IN A ACCUM. STORED ON STACK
        LDB  A,Y     LOAD REAL ADDRESS DATA FROM LRA TABLE
        COMB         COMP TO ADJ FOR PHYSICAL ADDR. IN X REG
        ASLB         ADJ DATA FOR RELOCATION IN X REG
        ASLB         ;
        ASLB         $FB97
        ASLB         ;
        LDA  2,S     GET MS BYTE OF LOGICAL ADDR.
        ANDA #$0F    MASK MS NIBBLE OF LOGICAL ADDRESS
        STA  2,S     SAVE IT IN X REG ON STACK
        ORB  2,S     SET MS BYTE IN X REG TO ADJ PHY ADDR.
*
* PLUS LS NIBBLE OF LOGICAL ADDRESS
        STB  2,S     SAVE AS LS 16 BITS OF PHY ADDR IN X REG
* ON STACK
        PULS A,B,X,Y,PC POP REGS. FROM STACK
        ENDIF DATOPT
*
* DELAY LOOP
*
DLY     PSHS B       SAVE CONTENTS OF "B"
        LDB  #$20    GET LOOP DELAY VALUE
SUB1    DECB         SUBTRACT ONE FROM VALUE
        BNE  SUB1    LOOP UNTIL ZERO
        PULS B,PC    RESTORE CONTENTS OF "B"
* RTS  ;
*
***** "L" LOAD MIKBUG TAPE *****
*
LOAD    JSR  ACINIZ
        LDA  #$11   LOAD 'DC1' CASS. READ ON CODE
        LBSR OUTCH  OUTPUT IT TO TERMINAL PORT
        CLR  ECHO   TURN OFF ECHO FLAG
LOAD1   LBSR ECHON  INPUT 8 BIT BYTE WITH NO ECHO
LOAD2   CMPA #'S    IS IT AN "S", START CHARACTER ?
        BNE  LOAD1  IF NOT, DISCARD AND GET NEXT CHAR.
        LBSR ECHON
        CMPA #'9    IS IT A "9" , END OF FILE CHAR ?
        BEQ  LOAD21 IF SO, EXIT LOAD
        CMPA #'1    IS IT A "1" , FILE LOAD CHAR ?
        BNE  LOAD2  IF NOT, LOOK FOR START CHAR.
        LBSR BYTE   INPUT BYTE COUNT
        PSHS A      PUSH COUNT ON STACK
        BVS  LODERR (V) C-CODE SET, ILLEGAL HEX
        LBSR IN1ADR INPUT LOAD ADDRESS
        BVS  LODERR (V) C-CODE SET, ADDR NOT HEX
        PSHS X      PUSH ADDR ON STACK
        LDB  ,S+    LOAD MSB OF ADDR AS CHECKSUM BYTE
        ADDB ,S+    ADD LSB OF ADDR TO CHECKSUM
        ADDB ,S     ADD BYTE COUNT BYTE TO CHECKSUM
        DEC  ,S     $FC37 DECREMENT BYTE COUNT 2 TO BYPASS
        DEC  ,S     ADDRESS BYTES.
LOAD10  PSHS B      PUSH CHECKSUM ON STACK
        LBSR BYTE   INPUT DATA BYTE (2 HEX CHAR)
        PULS B      POP CHECKSUM FROM STACK
        BVS  LODERR (V) SET, DATA BYTE NOT HEX
        PSHS A      PUSH DATA BYTE ON STACK
        ADDB ,S+    ADD DATA TO CHECKSUM, AUTO INC STACK
        DEC  ,S     DECREMENT BYTE COUNT 1
        BEQ  LOAD16 IF BYTE COUNT ZERO, TEST CHECKSUM
        STA  ,X+    SAVE DATA BYTE IN MEMORY
        BRA  LOAD10 GET NEXT DATA BYTE
LODERR  CLRB        ;ERROR CONDITION, ZERO CHECKSUM  ;
LOAD16  PULS A      ADJUST STACK (REMOVE BYTE COUNT)
        CMPB #$FF   CHECKSUM OK?
        BEQ  LOAD1  IF SO, LOAD NEXT LINE
        LDA  #'?    LOAD (?) ERROR INDICATOR
        LBSR OUTCH  OUTPUT IT TO TERMINAL
LOAD21  COM  ECHO   TURN ECHO ON
        LDA  #$13   $FC5F LOAD 'DC3' CASS. READ OFF CODE
        LBRA OUTCH  OUTPUT IT
*
***** "P" PUNCH MIKBUG TAPE *****
*
PUNCH   CLR  ,-S CLEAR RESERVED BYTE ON STACK
        LBSR IN2ADR GET BEGIN AND END ADDRESS
        PSHS X,Y SAVE ADDRESSES ON STACK
        BVS  PUNEXT (V) C-CODE SET, EXIT PUNCH
        CMPX 2,S COMPARE BEGIN TO END ADDR
        BCS  PUNEXT IF BEGIN GREATER THAN END, EXIT PUNCH
        LEAX 1,X INCREMENT END ADDRESS
        STX  ,S STORE END ADDR ON STACK
        JSR  ACINIZ
        LDA  #$12 LOAD 'DC2' PUNCH ON CODE
        LBSR OUTCH OUTPUT IT TO TERMINAL
PUNCH2  LDD  ,S LOAD END ADDR IN D-ACC
        SUBD 2,S SUBTRACT BEGIN FROM END
        BEQ  PUNCH3 SAME, PUNCH 32 BYTES DEFAULT
        CMPD #$20 LESS THAN 32 BYTES?
        BLS  PUNCH4 PUNCH THAT MANY BYTES
PUNCH3  LDB  #$20 LOAD BYTE COUNT OF 32.
PUNCH4  STB  4,S STORE ON STACK AS BYTE COUNT
        LDX  #MSG20 POINT TO MSG "S1"
        LBSR PSTRNG PRINT MSG
        ADDB #3 ADD 3 BYTES TO BYTE COUNT
        TFR  B,A GET BYTE COUNT IN A-ACC TO PUNCH
        LBSR OUT2H OUTPUT BYTE COUNT
        LDX  2,S LOAD BEGIN ADDRESS
        LBSR OUT4H PUNCH ADDRESS
        ADDB 2,S ADD ADDR MSB TO CHECKSUM
        ADDB 3,S ADD ADDR LSB TO CHECKSUM
PUNCHL  ADDB ,X ADD DATA BYTE TO CHECKSUM
        LDA  ,X+ LOAD DATA BYTE TO PUNCH
        LBSR OUT2H OUTPUT DATA BYTE
        DEC  4,S DECREMENT BYTE COUNT
        BNE  PUNCHL NOT DONE, PUNCH NEXT BYTE
        COMB  1's COMPLIMENT CHECKSUM BYTE
        TFR  B,A GET IT IN A-ACC TO PUNCH
        LBSR OUT2H OUTPUT CHECKSUM BYTE
        STX  2,S SAVE X-REG IN STACK AS NEW PUNCH ADDR
        CMPX ,S COMPARE IT TO END ADDR
        BNE  PUNCH2      $FCB5 PUNCH NOT DONE, CONT.
PUNEXT  LDA  #$14 LOAD 'DC4' PUNCH OFF CODE
        LBSR OUTCH OUTPUT IT
        LEAS 5,S READJUST STACK POINTER
        RTS  ;
*
* 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
       LBSR PDATA  PRINT MSG
       PULS X,PC RESTORE IX & RETURN
*
* LONG BRANCHES TO COMMON ROUTINES
*
JOUT1S  LBRA OUT1S
JBYTE   LBRA BYTE
JIN1ADR LBRA IN1ADR
*
* ALTER "PC" PROGRAM COUNTER
*
ALTRPC  LBSR  PRTPC   $FCF5 PRINT MSG " PC = "
ALTPC1  BSR  JOUT1S   OUTPUT SPACE
        BSR  JIN1ADR  GET NEW CONTENTS FOR "PC"
        BVS  ALTPCD  EXIT IF INVALID HEX
        STX  10,U    POKE IN NEW CONTENTS
ALTPCD  RTS          ;
*
* ALTER "U" USER STACK POINTER
*
ALTRU   BSR  PRTUS   $FCCA PRINT MSG " US = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JIN1ADR
        BVS  ALTUD
        STX  8,U
ALTUD   RTS ;
*
* ALTER "Y" INDEX REGISTER
*
ALTRY   BSR  PRTIY   PRINT MSG " IY = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JIN1ADR
        BVS  ALTYD
        STX  6,U     $F8F0
ALTYD   RTS ;
*
* ALTER "X" INDEX REGISTER
*
ALTRX   BSR  PRTIX   $FCE0 PRINT MSG " IX = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JIN1ADR
        BVS  ALTXD
        STX  4,U
ALTXD   RTS ;
*
* ALTER "DP" DIRECT PAGE REGISTER
*
ALTRDP  BSR  PRTDP   $FCD5 PRINT MSG " DP = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JBYTE    INPUT BYTE (2 HEX CHAR)
        BVS  ALTDPD
        STA  3,U
ALTDPD  RTS ;
*
* ALTER "B" ACCUMULATOR
*
ALTRB   BSR  PRTB    $FD09 PRINT MSG " B = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JBYTE    INPUT BYTE (2 HEX CHAR)
        BVS  ALTBD
        STA  2,U
ALTBD   RTS          $F91C
*
* ALTER "A" ACCUMULATOR
*
ALTRA   BSR  PRTA    $FCFF RINT MSG " A = "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JBYTE    INPUT BYTE (2 HEX CHAR)
        BVS  ALTAD
        STA  1,U
ALTAD   RTS ;
*
* ALTER "CC" REGISTER
*
ALTRCC  BSR  PRTCC   $FD13 PRINT MSG " CC: "
        BSR  JOUT1S   OUTPUT SPACE
        BSR  JBYTE    INPUT BYTE (2 HEX CHAR)
        BVS  ALTCCD
        ORA  #$80    SETS "E" FLAG IN PRINT LIST
        STA  ,U
ALTCCD  RTS ;
*
* PDATA
*
PRINT LBSR OUTCH
PDATA LDA  ,X+ GET 1st CHAR. TO PRINT
      CMPA #4 IS IT EOT?
      BNE  PRINT IF NOT EOT PRINT IT
      RTS  ;
*
* PRINT REGISTERS
*
PRTSP  LDX  #MSG10 POINT TO MSG "SP="
       BSR  PDATA  PRINT MSG
       TFR  U,X
JOUT4H LBRA OUT4H
*
PRTUS  LDX  #MSG12 POINT TO MSG "US="
       BSR  PDATA  PRINT MSG
       LDX  8,U
       BRA  JOUT4H
*
PRTDP  LDX   #MSG15 POINT TO MSG "DP="
       BSR  PDATA  PRINT MSG
       LDA  3,U
JOUT2H LBRA OUT2H OUTPUT HEX BYTE AS ASCII
*
PRTIX  LDX  #MSG14 POINT TO MSG "IX="
       BSR  PDATA  PRINT MSG
       LDX  4,U      $FCE6
       BRA  JOUT4H
*
PRTIY  LDX  #MSG13 POINT TO MSG "IY="
       BSR  PDATA  PRINT MSG
       LDX  6,U
       BRA  JOUT4H
*
PRTPC  LDX  #MSG11 POINT TO MSG "PC="
       BSR  PDATA  PRINT MSG
       LDX  10,U
       BRA  JOUT4H
*
PRTA   LDX  #MSG16 POINT TO MSG "A="
       BSR  PDATA  PRINT MSG
       LDA  1,U
       BRA  JOUT2H OUTPUT HEX BYTE AS ASCII
*
PRTB   LDX  #MSG17 POINT TO MSG "B="
       BSR  PDATA  PRINT MSG
       LDA  2,U
       BRA  JOUT2H OUTPUT HEX BYTE AS ASCII
*
PRTCC  LDX  #MSG18 POINT TO MSG "CC:"
       BSR  PDATA  PRINT MSG
       LDA  ,U
       LDX  #MSG19 POINT TO MSG "EFHINZVC"
       LBRA BIASCI OUTPUT IN BINARY/ASCII FORMAT
*
* "R" DISPLAY REGISTERS
*
REGSTR  LDX  #MSG5   POINT TO MSG " - "
        LBSR PSTRNG  PRINT MSG
        BSR PRTSP   $FCBF
        BSR PRTUS   $FCCA
        BSR PRTDP   $FCD5
        BSR PRTIX   $FCE0
        BSR PRTIY   $FCEB
        LDX  #MSG5   POINT TO MSG " - "
        LBSR PSTRNG  PRINT MSG
        BSR PRTPC   $FCF5
        BSR PRTA    $FCFF
        BSR PRTB    $FD09
        BRA PRTCC   $FD13
*
* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE
* OPERATOR TO INPUT TWO VALID HEX ADDRESSES.
* THE FIRST ADDRESS INPUT IS RETURNED IN "IY".
* THE SECOND IS RETURNED IN "IX". THE "V" BIT
* IN THE C-CODE REG. IS SET IF AN INVALID HEX
* ADDRESS IS INPUT.
*
IN2ADR BSR IN1ADR GET FIRST ADDRESS
       BVS NOTHEX EXIT IF NOT VALID HEX
       TFR  X,Y SAVE FIRST ADDR. IN "IY"
       LDA #'-
       LBSR OUTCH PRINT " - "
*
* THE FOLLOWING ROUTINE LOOPS WAITING FOR THE
* OPERATOR TO INPUT ONE VALID HEX ADDRESS. THE
* ADDRESS IS RETURNED IN THE "X" REGISTER.
*
IN1ADR BSR BYTE INPUT BYTE (2 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
*
       IFD EXTOPT
*
* EXTENDED USER COMMANDS
*
USRCMD JMP [MONEXT+EXTCMD]
       ENDIF EXTOPT
*
*
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 ?
       IFD  PS2OPT
       BNE GETST1
       LDX  #PS2KBD
       LDA  ,X
       BITA #1
       ENDIF PS2OPT
       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 ?
        IFD PS2OPT
        BNE  INCHEK1
        LDA  PS2KBD
        BITA #1 TEST READY BIT< RDRF ?
        ENDIF PS2OPT
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   IFD VDUOPT
        BSR  VOUTCH
        ENDIF VDUOPT
        IFD  DG640OPT
        BSR  VOUTCH
        ENDIF DG640OPT
AOUTCH  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
*
* IO INITIALIZATION
*
IOINIZ  EQU  *
        IFD  VDUOPT
        BSR  VINIZ
        ENDIF VDUOPT
        IFD  DG640OPT
        BSR  VINIZ
        ENDIF DG640OPT
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
*
        IFD VDUOPT
*
***************************************************
*      VDU8 ADM3A REGISTER-MAPPED EMULATOR        *
*                                                 *
*      80 x 25 Characters
*
***************************************************
*
***************************************************
*               INITIALIZE EMULATOR               *
***************************************************
*
VINIZ   LDX    #VDU
        LDD    #0
        STD    COLADX    AND ROWADX
        STA    VDUCOL,X
        STB    VDUROW,X
        STB    VDUOFF,X
        STD    NEWROW    AND ESCFLG
        LDB    #$02
        STB    VDUATT,X
        CLR    ESCFLG
        LDA    #$1B      SEND ESCAPE
        BSR    VOUTCH
        LDA    #'Y       CLEAR TO END OF SCREEN
*
** VIDEO OUTPUT ROUTINE
*
VOUTCH  PSHS   A,B,X     SAVE REGISTERS
        LDX    #VDU      POINT TO VDU REGISTERS
*
** CHECK FOR ESCAPE SEQUENCE
*
        TST    ESCFLG    ESCAPE ACTIVE?
        BEQ    SOROU1    BRANCH IF NOT
        BSR    ESCAPE    ELSE DO ESCAPE
        BRA    RETURN    AND RETURN
*
** CHECK FOR CONTROL CHARACTERS
*
SOROU1  CMPA   #$20      CONTROL CODES?
        BHS    SOROU2
        BSR    CONTRL    BRANCH IF SO
        BRA    RETURN
*
** OUTPUT TEXT CHARACTER
*
SOROU2  STAA   VDUCHR,X  DISPLAY CHARACTER
        LBSR   NEWCOL    UPDATE COLUMN
*
** DISPLAY CURSOR AND RETURN
*
RETURN  PULS   A,B,X,PC  RESTORE REGISTERS AND RETURN
*
***************************************************
*              CONTROL CODE HANDLERS              *
***************************************************
*
CONTRL  CMPA   #$08      CTRL H - BACKSPACE ?
        LBEQ   BACKSP
        CMPA   #$1B      ESCAPE SEQUENCE?
        LBEQ   SETESC
        CMPA   #$1A      CTRL Z - Clear Screen
        LBEQ   CLRSCR
        CMPA   #$16      CTRL ^ - Home
        LBEQ   HOME
        CMPA   #$D       CTRL M - RETURN?
        LBEQ   CRETN
        CMPA   #$0C      CTRL L - CHAR RIGHT
        LBEQ   CHRIGHT
        CMPA   #$0B      CTRL K - MOVE UP ONE LINE
        LBEQ   LINEUP
        CMPA   #$0A      CTRL J - LINE FEED
        BNE    RETESC    NONE OF THESE, RETURN
*
***************************************** LINE FEED
*
LINEFD  LDD    COLADX    GET CURRENT COLUMN AND ROW
        INCB             BUMP ROW
        CMPB   #NUMLIN   SCROLL TIME?
        LBNE   NEWCUR    POSITION CURSOR IF NOT
        LBRA   SCROLL    ELSE SCROLL IT
*
***************************************** LINE FEED
*
LINEUP  LDD    COLADX    GET CURRENT COLUMN AND ROW
        TSTB             AT TOP OF SCREEN ?
        LBEQ   RETESC    Yes, Ignore
        DECB             No, Decrement ROW
        LBRA   NEWCUR    POSITION CURSOR
*
*********************************** BACK SPACE
*
BACKSP  LDA    COLADX
        BEQ    RETESC      RETURN
        DECA
        LBRA   POSCOL    POSITION CURSOR
*
*********************************** CURSOR RIGHT
*
CHRIGHT LDA    COLADX
        INCA
        CMPA   #LINLEN
        LBEQ   RETESC
        LBRA   POSCOL
*
*********************************** CURSOR RIGHT
*
HOME    LDD    #0        HOME - POSITION TOP OF SCREEN
        LBRA    NEWCUR
*
***************************************************
*                 ESCAPE HANDLERS                 *
***************************************************
*
ESCAPE  LDAB   ESCFLG    GET FLAG
        CMPB   #'=       SETTING CURSOR?
        BEQ    ESCCUR    BRANCH IF SO
        CMPA   #'Y       CLEAR TO END OF SCREEN?
        LBEQ   ESCCLS
        CMPA   #'T       CLEAR TO END OF LINE?
        BEQ   ESCCLL
        CMPA   #'=       STARTING CURSOR SET?
        BNE    CLRESC    BRANCH IF NOT
*
***************************** START ESCAPE SEQUENCE
*
SETESC  STAA   ESCFLG    ELSE START CURSORING
        RTS              AND RETURN
*
CLRESC  CLR    ESCFLG    NO OTHERS SUPPORTED
RETESC  RTS              SO RETURN
*
********************************* SET SCREEN CURSOR
*
ESCCUR  TST    NEWROW    ROW SET?
        BNE    ESCCU1    BRANCH IF SO
        STAA   NEWROW    ELSE SET NEW ROW
        RTS              AND RETURN
*
ESCCU1  CLR    ESCFLG
        SUBA   #$20      ADJUST COLUMN ADDRESS
        CMPA   #LINLEN-1 CHECK FOR ACCEPTABLE COLUM
        BHI    RETESC    NOT OK, DO NOTHING
*
ESCCU2  LDAB   NEWROW
        CLR    NEWROW
        SUBB   #$20      ADJUST TO ROW ADDRESS
        CMPB   #NUMLIN-1 CHECK FOR ACCEPTABLE ROW
        BHI    RETESC    ELSE RETURN DOING NOTHING
        BRA    NEWCUR    GO SET NEW CURSOR IF SO
*
****************** CLEAR FROM CURSOR TO END OF LINE
CLRSCR  LDD    #0        CLEAR FROM TOP OF SCREEN
        BSR    NEWCUR
ESCCLL  LDA    COLADX
        LDB    #$20      AND CLEAR CHAR
ESCCL1  STB    VDUCHR,X  DISPLAY TEXT
        INCA
        STA    VDUCOL,X
        CMPA   #LINLEN   UNTIL END OF LINE
        BNE    ESCCL1
        CLR    ESCFLG
        RTS
*
*********************************** CARRIAGE RETURN
*
CRETN   CLRA               SET COLUMN ZERO
POSCOL  LDB    ROWADX    GET CURRENT ROW
*
*********** GENERATE NEW CURSOR POSITION AND RETURN
*
NEWCUR  STD    COLADX    SAVE NEW ROW AND COLUMN
        STA    VDUCOL,X  SET NEW COLUMN
        STB    VDUROW,X  SET NEW ROW
        RTS              AND RETURN
*
********************* UPDATE CURRENT COLUMN AND ROW
*
NEWCOL  LDD    COLADX    GET ROW AND COLUMN
        INCA             BUMP COLUMN
        CMPA   #LINLEN   ROLL?
        BNE    NEWCUR    BRANCH IF NOT
        CLRA             ELSE RESET TO ZERO
        INCB             AND BUMP ROW
        CMPB   #NUMLIN
        BNE    NEWCUR
        DECB             BOTTOM ROW
        BSR    NEWCUR
*
********************************* SCROLL THE SCREEN
*
SCROLL  LDB    VDUOFF,X
        INCB
        CMPB   #NUMLIN
        BLO    SCROL1
        CLRB
SCROL1  STB    VDUOFF,X
*
**************** CLEAR FROM CURSOR TO END OF SCREEN
*
ESCCLS  LDB    COLADX    GET CURSOR
        LDA    #$20      GET A SPACE
ESCCLS1 STB    COLADX
        STB    VDUCOL,X
        STA    VDUCHR,X
        INCB
        CMPB   #LINLEN
        BNE    ESCCLS1
*
        LDB    ROWADX
        INCB
        CMPB   #NUMLIN
        BEQ    ESCCLS2
        STB    ROWADX
        STB    VDUROW,X
        CLRB
        BRA    ESCCLS1
*
ESCCLS2 CLRB
        STB    COLADX
        STB    VDUCOL,X
        STB    ESCFLG
        RTS
        ENDIF VDUOPT
*
        IFD DG640OPT
***************************************************
*      TELEVIDEO-TYPE MEMORY-MAPPED EMULATOR      *
*                                                 *
* FOR HARD-WIRED MEMORY-MAPPED DISPLAYS USING THE *
* HIGH ORDER BIT OF EACH BYTE FOR  REVERSE  VIDEO *
* CURSORING  (SUCH  AS THE THOMAS INSTRUMENTATION *
* 16x64 BOARD).                                   *
***************************************************
 
***************************************************
*               INITIALIZE EMULATOR               *
***************************************************
 
VINIZ   LDX    #0
        STX    COLADX    AND ROWADX
        STX    NEWROW    AND ESCFLG
        LDX    #SCREEN   POINT TO SCREEN
        STX    CURSOR    SET PROGRAM CURSOR
        LDA    #$1B      SEND ESCAPE
        BSR    VOUTCH
        LDA    #'Y       CLEAR TO END OF SCREEN
*
** VIDEO OUTPUT ROUTINE
*
VOUTCH  PSHS   A,B,X     SAVE REGISTERS
*
** CLEAR CURSOR
        LDX    CURSOR
        LDB   0,X
        ANDB   #$7F
        STB   0,X
*
** CHECK FOR ESCAPE SEQUENCE
        TST    ESCFLG    ESCAPE ACTIVE?
        BEQ    SOROU1    BRANCH IF NOT
        BSR   ESCAPE    ELSE DO ESCAPE
        BRA    RETURN    AND RETURN
*
** CHECK FOR CONTROL CHARACTERS
SOROU1  CMPA   #$20      CONTROL CODES?
        BHS    SOROU2
        BSR    CONTRL    BRANCH IF SO
        BRA    RETURN
*
** OUTPUT TEXT CHARACTER
SOROU2  LDX    CURSOR    ELSE GET CURSOR
        STAA   0,X       DISPLAY CHARACTER
        LBSR   NEWCOL    UPDATE COLUMN
*
** DISPLAY CURSOR AND RETURN
RETURN  LDX    CURSOR    AND DISPLAY IT
        LDB    ,X
        ORAB   #$80      WITH REVID
        STB    ,X
        PULS   A,B,X,PC  RESTORE REGISTERS AND RETURN
 
***************************************************
*              CONTROL CODE HANDLERS              *
***************************************************
 
CONTRL  CMPA   #$08      CTRL H - BACKSPACE ?
        LBEQ   BACKSP
        CMPA   #$1B      ESCAPE SEQUENCE?
        LBEQ   SETESC
        CMPA   #$D       CTRL M - RETURN?
        LBEQ   CRETN
        CMPA   #$0A      CTRL J - LINE FEED
        BNE    RETESC    NONE OF THESE, RETURN
 
***************************************** LINE FEED
 
LINEFD  LDD    COLADX    GET CURRENT COLUMN AND ROW
        INCB             BUMP ROW
        CMPB   #NUMLIN   SCROLL TIME?
        LBNE   NEWCUR    POSITION CURSOR IF NOT
        LBRA   SCROLL    ELSE SCROLL IT
 
***************************************** LINE FEED
 
LINEUP  LDD    COLADX    GET CURRENT COLUMN AND ROW
        TSTB             AT TOP OF SCREEN ?
        BEQ   RETESC    Yes, Ignore
        DECB             No, Decrement ROW
        LBRA   NEWCUR    POSITION CURSOR
 
 
*********************************** BACK SPACE
 
BACKSP  LDA    COLADX
        BEQ    RETESC      RETURN
        DECA
        LBRA   POSCOL    POSITION CURSOR
 
*********************************** CURSOR RIGHT
 
CHRIGHT LDA    COLADX
        INCA
        CMPA   #LINLEN
        BEQ   RETESC
        LBRA   POSCOL
 
***************************************************
*                 ESCAPE HANDLERS                 *
***************************************************
 
ESCAPE  LDAB   ESCFLG    GET FLAG
        CMPB   #'=       SETTING CURSOR?
        BEQ    ESCCUR    BRANCH IF SO
        CMPA   #'Y       CLEAR TO END OF SCREEN?
        LBEQ   ESCCLS
        CMPA   #'T       CLEAR TO END OF LINE?
        BEQ   ESCCLL
        CMPA   #'E       INSERT LINE?
        BEQ   ESCINL
        CMPA   #'R       DELETE LINE?
        BEQ   ESCDLL
        CMPA   #'=       STARTING CURSOR SET?
        BNE    CLRESC    BRANCH IF NOT
 
***************************** START ESCAPE SEQUENCE
 
SETESC  STAA   ESCFLG    ELSE START CURSORING
        RTS              AND RETURN
 
CLRESC  CLR    ESCFLG    NO OTHERS SUPPORTED
RETESC  RTS              SO RETURN
 
********************************* SET SCREEN CURSOR
 
ESCCUR  TST   NEWROW    ROW SET?
        BNE   ESCCU1    BRANCH IF SO
        STAA  NEWROW    ELSE SET NEW ROW
        RTS              AND RETURN
 
ESCCU1  CLR   ESCFLG
        SUBA  #$20      ADJUST COLUMN ADDRESS
        CMPA  #LINLEN-1 CHECK FOR ACCEPTABLE COLUM
        BHI   RETESC    NOT OK, DO NOTHING
 
ESCCU2  LDAB  NEWROW
        CLR   NEWROW
        SUBB  #$20      ADJUST TO ROW ADDRESS
        CMPB  #NUMLIN-1 CHECK FOR ACCEPTABLE ROW
        BHI   RETESC    ELSE RETURN DOING NOTHING
        BRA   NEWCUR    GO SET NEW CURSOR IF SO
*
*************************** DELETE LINE FROM SCREEN
 
ESCDLL  BSR   CRETN     GO COL. ZERO
        LDB   ROWADX
        CMPB  #NUMLIN-1
        BEQ   SCROL3
        BRA   SCROL1    AND DELETE THIS LINE
 
*************************** INSERT LINE INTO SCREEN
 
ESCINL  BSR   CRETN    GO TO COL. ZERO
        LDAB  ROWADX
        CMPB  #NUMLIN-1
        BEQ   ESCCLL
*
** SCROLL SCREEN DOWN FROM CURSOR
*
        LDX   #SCREEN+SCNLEN-LINLEN
ESCIN0  LDAA  0,-X
        STAA  LINLEN,X
        LDA   SCNLEN,X
        STA   SCNLEN+LINLEN,X
        CPX   CURSOR
        BNE   ESCIN0
 
****************** CLEAR FROM CURSOR TO END OF LINE
 
ESCCLL  LDA   COLADX    GET CURRENT COLUMN
        LDX   CURSOR    GET CURSOR
        LDB   #$20      AND CLEAR CHAR
ESCLL1  STB   SCNLEN,X  CLEAR ATTRIBUTE
        STB   ,X+       CLEAR TEXT
        INCA
        CMPA  #LINLEN   UNTIL END OF LINE
        BNE   ESCLL1
        CLR   ESCFLG
        RTS
 
*********************************** CARRIAGE RETURN
 
CRETN   CLRA               SET COLUMN ZERO
POSCOL  LDB   ROWADX    GET CURRENT ROW
 
*********** GENERATE NEW CURSOR POSITION AND RETURN
 
NEWCUR  STD   COLADX    SAVE NEW ROW AND COLUMN
        LDA   #LINLEN   ELSE ADD A LINE
        MUL              LINLEN * ROWADX
        ADDB  COLADX
        ADCA  #0
        ADDD  #SCREEN   ADD SCREEN BASE.
        STD   CURSOR    SAVE NEW CURSOR
        TFR   D,X       GET CURSOR IN X
        RTS              AND RETURN
 
********************* UPDATE CURRENT COLUMN AND ROW
 
NEWCOL  LDD   COLADX    GET ROW AND COLUMN
        INCA             BUMP COLUMN
        CMPA  #LINLEN   ROLL?
        BNE   NEWCUR    BRANCH IF NOT
        CLRA             ELSE RESET TO ZERO
        INCB             AND BUMP ROW
        CMPB  #NUMLIN
        BNE   NEWCUR
        DECB             BOTTOM ROW
        BSR   NEWCUR
 
********************************* SCROLL THE SCREEN
 
SCROLL  LDX   #SCREEN   POINT TO SCREEN
SCROL1  LDA   SCNLEN+LINLEN,X
        STA   SCNLEN,X
        LDAA  LINLEN,X  MOVE TWO BYTES
        STAA  0,X+      UP ONE LINE
        CMPX  #SCREEN+SCNLEN-LINLEN
        BNE   SCROL1    LOOP UNTIL DONE
        BRA   SCROL3
 
**************** CLEAR FROM CURSOR TO END OF SCREEN
 
ESCCLS  LDX   CURSOR    GET CURSOR
SCROL3  LDAA  #$20      GET A SPACE
SCROL2  STA   SCNLEN,X  CLEAR ATTRIBUTES
        STA   ,X+       AND TEXT
        CMPX  #SCREEN+SCNLEN
        BNE   SCROL2    UNTIL DONE
        CLR   ESCFLG
        RTS
        ENDIF DG640OPT
*
        IFD PRTOPT
*************************************
*
** PRINTER DRIVER ROUTINES
*
*************************************
*
** PINIZ - INITIATE PRINTER PORT
*
PINIZ   PSHS B
        LDD #DIRMSK*256+$04 ACCA=DIRMSK ACCB=$04
        STD PADATA SET DDR AND SELECT DATA
*
** RESET PRINTER
        LDB #PRESET
        STAB PADATA
RESTLP  INCB DELAY FOR RESET
        BNE RESTLP
        STAA PADATA ACCA=DIRMSK
*
** INITALIZE PORT B (DATA PORT)
        LDAA #$2A
        STAA PBCTRL
        LDD #$FF2E ACCA=$FF ACCB =%00101110
        STD PBDATA PBDREG   PBCTRL
*
** SELECT 66 LINES/PAGE
        LDAA #$1B
        BSR POUTCH
        LDAA #'C
        BSR POUTCH
        LDAA #66
        PULS B
*************************************
*
** OUTPUT A CHARACTER TO THE PRINTER
*
*************************************
POUTCH  PSHS B
        LDAB PBDATA CLEAR INTERRUPT BIT
*
** WAIT TILL NOT BUSY
BUSYLP  LDAB PADATA
        BITB #PERROR
        BEQ PEXIT
        TSTB
        BMI BUSYLP
*
** NOW OUTPUT CHARACTER
        STAA PBDATA
PEXIT   PULS B,PC
*************************************
*
** PCHK TEST IFD PRINTER READY
*
*************************************
PCHK    TST PBCTRL TEST STATE OF CRB7
        RTS SET ON ACKNOWLEDGE
        ENDIF PRTOPT
*************************************
*
* MONITOR KEYBOARD COMMAND JUMP TABLE
*
*************************************
*
JMPTAB EQU *
 FCB 1 " ^A "
 FDB ALTRA
 FCB 2 " ^B "
 FDB ALTRB
 FCB 3 " ^C "
 FDB ALTRCC
 FCB 4 " ^D "
 FDB ALTRDP
 FCB $10 " ^P "
 FDB ALTRPC
 FCB $15 " ^U "
 FDB ALTRU
 FCB $18 " ^X "
 FDB ALTRX
 FCB $19 " ^Y "
 FDB ALTRY
*
 FCC 'B'
 FDB BRKPNT
 FCC 'E'
 FDB MEMDUMP
 FCC 'G'
 FDB GO
 FCC 'L'
 FDB LOAD
 FCC 'P'
 FDB PUNCH
 FCC 'M'
 FDB MEMCHG
 FCC 'R'
 FDB REGSTR
 FCC 'S'
 FDB DISSTK
 FCC 'X'
 FDB XBKPNT
 IFD MFDCOPT
 FCC 'D'      *** SWTPC USES 'U' FOR MINIBOOT
 FDB MINBOOT
 ENDIF MFDCOPT
 IFD CF8OPT
 FCC 'D'      *** FPGA 8 BIT USES 'D' FOR CFBOOT
 FDB CFBOOT
 ENDIF CF8OPT
 IFD IDEOPT
 FCC 'D'      *** XESS FPGA 16 BIT IDE USES 'D' FOR IDEBOOT
 FDB IDEBOOT
 ENDIF IDEOPT
 IFD DMAFOPT
 FCC 'U'      *** SWTPC USES 'D' FOR DMAF2 BOOT
 FDB DBOOT
 ENDIF DMAFOPT
 IFD EXTOPT
 FCC 'U'      *** IF FPGA, 'U' IS FOR USER
 FDB USRCMD
 ENDIF EXTOPT
 IFD RTCOPT
 FCC 'T'
 FDB TIMSET
 ENDIF RTCOPT
 IFD TRAOPT
 FCC "T"
 FDB TRACE
 ENDIF TRAOPT
*
TABEND EQU *
*
* ** 6809 VECTOR ADDRESSES **
*
* FOLLOWING ARE THE ADDRESSES OF THE VECTOR ROUTINES
* FOR THE 6809 PROCESSOR. DURING INITIALIZATION THEY
* ARE RELOCATED TO RAM FROM $DFC0 TO $DFCF. THEY ARE
* RELOCATED TO RAM SO THAT THE USER MAY REVECTOR TO
* HIS OWN ROUTINES IF HE SO DESIRES.
*
*
RAMVEC FDB SWIE  USER-V
 FDB RTI    SWI3-V
 FDB RTI    SWI2-V
 FDB RTI    FIRQ-V
 FDB RTI    IRQ-V
 FDB SWIE   SWI-V
 FDB $FFFF  SVC-VO
 FDB $FFFF  SVC-VL
*
* PRINTABLE MESSAGE STRINGS
*
MSG1  FCB $D,$A,$0,$0,$0 * 0, CR/LF, 0
      FCC 'SYS09BUG 1.4 FOR '
      IFD S3EOPT
      FCC 'S3E '
      ENDIF S3EOPT
      IFD B5XOPT
      FCC 'B5-X300 '
      ENDIF B5XOPT
      IFD S3SOPT
      FCC 'S3STARTER '
      ENDIF S3SOPT
      IFD ADSOPT
      FCC 'ADS6809 '
      ENDIF ADSOPT
      IFD SWTOPT`
      FCC 'SWTPC '
      ENDIF SWTOPT
      IFD XESOPT`
      FCC  'XESS '
      ENDIF XESOPT
      FCC ' - '
      FCB 4
MSG2  FCB 'K,$D,$A,$00,$00,$00,$04 K, * CR/LF + 3 NULS
MSG3  FCC '>'
      FCB 4
MSG4  FCC 'WHAT?'
      FCB 4
MSG5  FCC ' - '
      FCB 4'
MSG10 FCC '  SP='
      FCB 4
MSG11 FCC '  PC='
      FCB 4
MSG12 FCC '  US='
      FCB 4
MSG13 FCC '  IY='
      FCB 4
MSG14 FCC '  IX='
      FCB 4
MSG15 FCC '  DP='
      FCB 4
MSG16 FCC '  A='
      FCB 4
MSG17 FCC '  B='
      FCB 4
MSG18 FCC '  CC: '
      FCB 4
MSG19 FCC 'EFHINZVC'
MSG20 FCC 'S1'
      FCB 4
        IFD DATOPT
*
* POWER UP/ RESET/ NMI ENTRY POINT
*
 ORG $FF00
*
*
START LDX  #IC11  POINT TO DAT RAM IC11
        LDA  #$F GET COMPLIMENT OF ZERO
*
*
* INITIALIZE DAT RAM --- LOADS $F-$0 IN LOCATIONS $0-$F
* OF DAT RAM, THUS STORING COMPLEMENT OF MSB OF ADDRESS
* IN THE DAT RAM. THE COMPLEMENT IS REQUIRED BECAUSE THE
* OUTPUT OF IC11, A 74S189, IS THE INVERSE OF THE DATA
* STORED IN IT.
*
*
DATLP STA  ,X+ STORE & POINT TO NEXT RAM LOCATION
        DECA  GET COMP. VALUE FOR NEXT LOCATION
        BNE  DATLP ALL 16 LOCATIONS INITIALIZED ?
*
* NOTE: IX NOW CONTAINS $0000, DAT RAM IS NO LONGER
*       ADDRESSED, AND LOGICAL ADDRESSES NOW EQUAL
*       PHYSICAL ADDRESSES.
*
        LDA  #$F0
        STA  ,X STORE $F0 AT $FFFF
        LDX  #$D0A0 ASSUME RAM TO BE AT $D000-$DFFF
        LDY  #TSTPAT LOAD TEST DATA PATTERN INTO "Y"
TSTRAM LDU  ,X SAVE DATA FROM TEST LOCATION
        STY  ,X STORE TEST PATTERN AT $D0A0
        CMPY ,X IS THERE RAM AT THIS LOCATION ?
        BEQ  CNVADR IF MATCH THERE'S RAM, SO SKIP
        LEAX -$1000,X ELSE POINT 4K LOWER
        CMPX #$F0A0 DECREMENTED PAST ZER0 YET ?
        BNE  TSTRAM IF NOT CONTINUE TESTING FOR RAM
        BRA  START ELSE START ALL OVER AGAIN
*
*
* THE FOLLOWING CODE STORES THE COMPLEMENT OF
* THE MS CHARACTER OF THE FOUR CHARACTER HEX
* ADDRESS OF THE FIRST 4K BLOCK OF RAM LOCATED
* BY THE ROUTINE "TSTRAM" INTO THE DAT RAM. IT
* IS STORED IN RAM IN THE LOCATION THAT IS
* ADDRESSED WHEN THE PROCESSOR ADDRESS IS $D---,
* THUS IF THE FIRST 4K BLOCK OF RAM IS FOUND
* WHEN TESTING LOCATION $70A0, MEANING THERE
* IS NO RAM PHYSICALLY ADDRESSED IN THE RANGE
* $8000-$DFFF, THEN THE COMPLEMENT OF THE
* "7" IN THE $70A0 WILL BE STORED IN
* THE DAT RAM. THUS WHEN THE PROCESSOR OUTPUTS
* AN ADDRESS OF $D---, THE DAT RAM WILL RESPOND
* BY RECOMPLEMENTING THE "7" AND OUTPUTTING THE
* 7 ONTO THE A12-A15 ADDRESS LINES. THUS THE
* RAM THAT IS PHYSICALLY ADDRESSED AT $7---
* WILL RESPOND AND APPEAR TO THE 6809 THAT IT
* IS AT $D--- SINCE THAT IS THE ADDRESS THE
* 6809 WILL BE OUTPUTING WHEN THAT 4K BLOCK
* OF RAM RESPONDS.
*
*
CNVADR  STU  ,X RESTORE DATA AT TEST LOCATION
        TFR  X,D PUT ADDR. OF PRESENT 4K BLOCK IN D
        COMA  COMPLEMENT MSB OF THAT ADDRESS
        LSRA  PUT MS 4 BITS OF ADDRESS IN
        LSRA  LOCATION D0-D3 TO ALLOW STORING
        LSRA  IT IN THE DYNAMIC ADDRESS
        LSRA  TRANSLATION RAM.
        STA  $FFFD STORE XLATION FACTOR IN DAT "D"
*
        LDS  #STACK INITIALIZE STACK POINTER
*
*
* THE FOLLOWING CHECKS TO FIND THE REAL PHYSICAL ADDRESSES
* OF ALL 4K BLKS OF RAM IN THE SYSTEM. WHEN EACH 4K BLK
* OF RAM IS LOCATED, THE COMPLEMENT OF IT'S REAL ADDRESS
* IS THEN STORED IN A "LOGICAL" TO "REAL" ADDRESS XLATION
* TABLE THAT IS BUILT FROM $DFD0 TO $DFDF. FOR EXAMPLE IF
* THE SYSTEM HAS RAM THAT IS PHYSICALLY LOCATED (WIRED TO
* RESPOND) AT THE HEX LOCATIONS $0--- THRU $F---....
*
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
* 4K 4K 4K 4K 4K 4K 4K 4K -- 4K 4K 4K 4K -- -- --
*
* ....FOR A TOTAL OF 48K OF RAM, THEN THE TRANSLATION TABLE
* CREATED FROM $DFD0 TO $DFDF WILL CONSIST OF THE FOLLOWING....
*
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
* 0F 0E 0D 0C 0B 0A 09 08 06 05 00 00 04 03 F1 F0
*
*
* HERE WE SEE THE LOGICAL ADDRESSES OF MEMORY FROM $0000-$7FFF
* HAVE NOT BEEN SELECTED FOR RELOCATION SO THAT THEIR PHYSICAL
* ADDRESS WILL = THEIR LOGICAL ADDRESS; HOWEVER, THE 4K BLOCK
* PHYSICALLY AT $9000 WILL HAVE ITS ADDRESS TRANSLATED SO THAT
* IT WILL LOGICALLY RESPOND AT $8000. LIKEWISE $A,$B, AND $C000
* WILL BE TRANSLATED TO RESPOND TO $9000,$C000, AND $D000
* RESPECTIVELY. THE USER SYSTEM WILL LOGICALLY APPEAR TO HAVE
* MEMORY ADDRESSED AS FOLLOWS....
*
*  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
* 4K 4K 4K 4K 4K 4K 4K 4K 4K 4K -- -- 4K 4K -- --
*
*
        LDY  #LRARAM POINT TO LOGICAL/REAL ADDR. TABLE
        STA  13,Y STORE $D--- XLATION FACTOR AT $DFDD
        CLR  14,Y CLEAR $DFDE
        LDA  #$F0 DESTINED FOR IC8 AN MEM EXPANSION ?
        STA  15,Y STORE AT $DFDF
        LDA  #$0C PRESET NUMBER OF BYTES TO CLEAR
CLRLRT CLR  A,Y CLEAR $DFDC THRU $DFD0
        DECA SUB. 1 FROM BYTES LEFT TO CLEAR
        BPL  CLRLRT CONTINUE IF NOT DONE CLEARING
FNDRAM LEAX -$1000,X POINT TO NEXT LOWER 4K OF RAM
        CMPX #$F0A0 TEST FOR DECREMENT PAST ZERO
        BEQ  FINTAB SKIP IF FINISHED
        LDU  ,X SAVE DATA AT CURRENT TEST LOCATION
        LDY  #TSTPAT LOAD TEST DATA PATTERN INTO Y REG.
        STY  ,X STORE TEST PATT. INTO RAM TEST LOC.
        CMPY ,X VERIFY RAM AT TEST LOCATION
        BNE  FNDRAM IF NO RAM GO LOOK 4K LOWER
        STU  ,X ELSE RESTORE DATA TO TEST LOCATION
        LDY  #LRARAM POINT TO LOGICAL/REAL ADDR. TABLE
        TFR  X,D PUT ADDR. OF PRESENT 4K BLOCK IN D
        LSRA  PUT MS 4 BITS OF ADDR. IN LOC. D0-D3
        LSRA  TO ALLOW STORING IT IN THE DAT RAM.
        LSRA
        LSRA
        TFR  A,B SAVE OFFSET INTO LRARAM TABLE
        EORA #$0F INVERT MSB OF ADDR. OF CURRENT 4K BLK
        STA  B,Y SAVE TRANSLATION FACTOR IN LRARAM TABLE
        BRA  FNDRAM GO TRANSLATE ADDR. OF NEXT 4K BLK
FINTAB LDA  #$F1 DESTINED FOR IC8 AND MEM EXPANSION ?
        LDY  #LRARAM POINT TO LRARAM TABLE
        STA  14,Y STORE $F1 AT $DFCE
*
* THE FOLLOWING CHECKS TO SEE IF THERE IS A 4K BLK OF
* RAM LOCATED AT $C000-$CFFF. IF NONE THERE IT LOCATES
* THE NEXT LOWER 4K BLK AN XLATES ITS ADDR SO IT
* LOGICALLY RESPONDS TO THE ADDRESS $C---.
*
*
        LDA  #$0C PRESET NUMBER HEX "C"
FINDC   LDB  A,Y GET ENTRY FROM LRARAM TABLE
        BNE  FOUNDC BRANCH IF RAM THIS PHYSICAL ADDR.
        DECA  ELSE POINT 4K LOWER
        BPL  FINDC GO TRY AGAIN
        BRA  XFERTF
FOUNDC  CLR  A,Y CLR XLATION FACTOR OF 4K BLOCK FOUND
        STB  $C,Y GIVE IT XLATION FACTOR MOVING IT TO $C---
*
* THE FOLLOWING CODE ADJUSTS THE TRANSLATION
* FACTORS SUCH THAT ALL REMAINING RAM WILL
* RESPOND TO A CONTIGUOUS BLOCK OF LOGICAL
* ADDRESSES FROM $0000 AND UP....
*
        CLRA  START AT ZERO
        TFR  Y,X START POINTER "X" START OF "LRARAM" TABLE.
COMPRS  LDB  A,Y GET ENTRY FROM "LRARAM" TABLE
        BEQ  PNTNXT IF IT'S ZER0 SKIP
        CLR  A,Y ELSE ERASE FROM TABLE
        STB  ,X+ AND ENTER ABOVE LAST ENTRY- BUMP
PNTNXT  INCA GET OFFSET TO NEXT ENTRY
        CMPA #$0C LAST ENTRY YET ?
        BLT  COMPRS
*
* THE FOLLOWING CODE TRANSFER THE TRANSLATION
* FACTORS FROM THE LRARAM TABLE TO IC11 ON
* THE MP-09 CPU CARD.
*
XFERTF  LDX  #IC11  POINT TO DAT RAM IC11
        LDB  #$10 GET NO. OF BYTES TO MOVE
FETCH   LDA  ,Y+ GET BYTE AND POINT TO NEXT
        STA  ,X+ POKE XLATION FACTOR IN IC11
        DECB  SUB 1 FROM BYTES TO MOVE
        BNE  FETCH CONTINUE UNTIL 16 MOVED
*
        ELSE
LRA     RTS
START   LDS  #STACK INITIALIZE STACK POINTER
        CLRB
        ENDIF DATOPT
*
        COMB  SET "B" NON-ZERO
        STB  ECHO TURN ON ECHO FLAG
        LBRA MONITOR INITIALIZATION IS COMPLETE
*
** INTERRUPT JUMP VECTORS
*
V1 JMP  [STACK]
V2 JMP  [SWI2]
V3 JMP  [FIRQ]
V4 JMP  [IRQ]
V5 JMP  [SWI]
*
* SWI3 ENTRY POINT
*
SWI3E  TFR  S,U
       LDX  10,U      *$FFC8
       LDB  ,X+
       STX  10,U
       CLRA
       ASLB
       ROLA
       LDX  SVCVO
       CMPX #$FFFF
       BEQ  SWI3Z
       LEAX D,X
       CMPX SVCVL
       BHI  SWI3Z
       PSHS X
       LDD  ,U
       LDX  4,U
       JMP  [,S++]
SWI3Z PULU A,B,X,CC,DP
       LDU  2,U
       JMP  [SWI3]
*
* 6809 VECTORS
*
       ORG $FFF0
       FDB V1    USER-V
       FDB SWI3E SWI3-V
       FDB V2    SWI2-V
       FDB V3    FIRQ-V
       FDB V4    IRQ-V
       FDB V5    SWI-V
       FDB V1    NMI-V
       FDB START RESTART-V
       END START

Line No.	Rev	Author	Line
1	59	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			`* 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			`*`
26			`* MODIFIED TO SYS09BUG VER 1.1`
27			`* FOR: SYSTEM09 FPGA SYSTEM`
28			`* BY: JOHN KENT`
29			`* DATE: 7TH JANUARY 2007`
30			`* ADDED: 'U' USER EXTENTION COMMANDS AT $F000`
31			`* CONDITIONAL ASSEMBLY OF FLOPPY BOOTS`
32			`* AND REALTIME CLOCK`
33			`*`
34			`* MODIFIED TO SYS09BUG VER 1.2`
35			`* FOR: SYSTEM09 FPGA SYSTEM`
36			`* BY: JOHN KENT`
37			`* DATE: 21ST MAY 2007`
38			`* ADDED: COMPACT FLASH BOOT TO FPGA VERSION`
39			`* REMOVED PORT REDIRECTION ON PUNCH & LOAD`
40			`*`
41			`* Modified to SYS09BUG VER 1.3`
42			`* FOR: SYSTEM09 FPGA SYSTEM`
43			`* BY: JOHN KENT`
44			`* DATE: 8TH JAN 2008`
45			`* ADDED: CONDITIONALS FOR SPARTAN3E STARTER BOARD`
46			`* WITH ONLY 32K OF RAM`
47			`*`
48			`* Modified to SYS09BUG VER 1.4`
49			`* FOR: SYSTEM09 FPGA SYSTEM`
50			`* BY: JOHN KENT`
51			`* DATE: 3RD FEB 2008`
52			`* ADDED: CONDITIONALS FOR XESS BOARD WITH IDE`
53			`* SEPERATE CONDITIONAL FOR S3 STARTER AND B5-X300`
54			`* 16 BIT IDE DISK BOOT STRAP ROUTINE`
55			`* CHANGED: SEPARARTED OPTIONS EQUATES AND BODY INTO SEPARATE FILES`
56			`*`
57			`* * COMMANDS *`
58			`*`
59			`* CONTROL A = ALTER THE "A" ACCUMULATOR`
60			`* CONTROL B = ALTER THE "B" ACCUMULATOR`
61			`* CONTROL C = ALTER THE CONDITION CODE REGISTER`
62			`* CONTROL D = ALTER THE DIRECT PAGE REGISTER`
63			`* CONTROL P = ALTER THE PROGRAM COUNTER`
64			`* CONTROL U = ALTER USER STACK POINTER`
65			`* CONTROL X = ALTER "X" INDEX REGISTER`
66			`* CONTROL Y = ALTER "Y" INDEX REGISTER`
67			`* B hhhh = SET BREAKPOINT AT LOCATION $hhhh`
68			`* D = 5.25" MINIFLOPPY BOOT`
69			`* E ssss-eeee = EXAMINE MEMORY`
70			`* FROM STARTING ADDRESS ssss`
71			`* TO ENDING ADDRESS eeee.`
72			`* G = CONTINUE EXECUTION FROM BREAKPOINT OR SWI`
73			`* L = LOAD TAPE`
74			`* M hhhh = EXAMINE AND CHANGE MEMORY LOCATION hhhh`
75			`* P ssss-eeee = PUNCH TAPE, START ssss TO END eeee ADDR.`
76			`* R = DISPLAY REGISTER CONTENTS`
77			`* S = DISPLAY STACK FROM ssss TO $DFC0`
78			`* U = 8" DMAF2 FLOPPY BOOT`
79			`* U = USER EXTENSION COMMANDS AT $F000`
80			`* X = REMOVE ALL BREAKPOINTS`
81			`*`
82			`*`
83			`***************************************************`
84			`* SYS09BUG VARIABLE SPACE`
85			`***************************************************`
86			`*`
87			`ORG MONRAM`
88			`STACK EQU * TOP OF INTERNAL STACK`
89			`NMI RMB 2 USER NMI VECTOR`
90			`SWI3 RMB 2 SOFTWARE INTERRUPT VECTOR #3`
91			`SWI2 RMB 2 SOFTWARE INTERRUPT VECTOR #2`
92			`FIRQ RMB 2 FAST INTERRUPT VECTOR`
93			`IRQ RMB 2 INTERRUPT VECTOR`
94			`SWI RMB 2 SOFTWARE INTERRUPT VECTOR`
95			`SVCVO RMB 2 SUPERVISOR CALL VECTOR ORGIN`
96			`SVCVL RMB 2 SUPERVISOR CALL VECTOR LIMIT`
97			`IFD DATOPT`
98			`LRARAM RMB 16 LRA ADDRESSES`
99			`ENDIF DATOPT`
100			`CPORT RMB 2 RE-VECTORABLE CONTROL PORT`
101			`ECHO RMB 1 ECHO FLAG`
102			`BPTBL RMB 24 BREAKPOINT TABLE BASE ADDR`
103			`IFD TRAOPT`
104			`NMISAV RMB 2 NMI Jump Vector Backup`
105			`TRACNT RMB 2 Trace Count`
106			`ENDIF TRAOPT`
107			`IFD VDUOPT`
108			`*`
109			`**************************************************`
110			`* VDU8 DISPLAY DRIVER VARIABLES *`
111			`**************************************************`
112			`*`
113			`** ALWAYS KEEP COLADX AND ROWADX TOGETHER ****`
114			`COLADX RMB 1 CURSOR COLUMN`
115			`ROWADX RMB 1 CURSOR ROW`
116			`**************************************************`
117			`*`
118			`NEWROW RMB 1 NEW ROW TEMP FOR ESCAPE`
119			`ESCFLG RMB 1 ESCAPE SEQUENCE ACTIVE`
120			`ENDIF VDUOPT`
121			`IFD DG640OPT`
122			`*`
123			`***************************************************`
124			`* DG640 MEMORY MAPPED DISPLAY DRIVER VARIABLES *`
125			`***************************************************`
126			`*`
127			`*** ALWAYS KEEP THESE TWO BYTES TOGETHER ***`
128			`COLADX RMB 1 CURSOR COLUMN`
129			`ROWADX RMB 1 CURSOR ROW`
130			`*************************************************`
131			`CURSOR RMB 2 ABSOLUTE SCREEN ADDRESS`
132			`NEWROW RMB 1 NEW ROW TEMP FOR ESCAPE`
133			`ESCFLG RMB 1 ESCAPE SEQUENCE ACTIVE`
134			`ENDIF DG640OPT`
135			`*`
136			`*`
137			`***************************************************`
138			`* START OF ROM *`
139			`***************************************************`
140			`*`
141			`ORG MONROM`
142			`FDB MONITOR`
143			`FDB NEXTCMD`
144			`FDB INCH`
145			`FDB INCHE`
146			`FDB INCHEK`
147			`FDB OUTCH`
148			`FDB PDATA`
149			`FDB PCRLF`
150			`FDB PSTRNG`
151			`FDB LRA`
152			`*`
153			`IFD ADSOPT`
154			`FDB PCHK CHECK FOR PRINTER INPUT`
155			`FDB PINIZ INITIATE PRINTER`
156			`FDB POUTCH OUTPUT CH. TO PRINTER`
157			`FDB VINIZ`
158			`FDB VOUTCH`
159			`FDB ACINIZ`
160			`FDB AOUTCH`
161			`ENDIF ADSOPT`
162			`*`
163			`* MONITOR`
164			`*`
165			`* VECTOR ADDRESS STRING IS.....`
166			`* $F8A1-$F8A1-$F8A1-$F8A1-$F8A1-$FAB0-$FFFF-$FFFF`
167			`*`
168			`MONITOR LDX #RAMVEC POINT TO VECTOR ADDR. STRING`
169			`LDY #STACK POINT TO RAM VECTOR LOCATION`
170			`LDB #$10 BYTES TO MOVE = 16`
171			`LOOPA LDA ,X+ GET VECTOR BYTE`
172			`STA ,Y+ PUT VECTORS IN RAM / $DFC0-$DFCF`
173			`DECB SUBTRACT 1 FROM NUMBER OF BYTES TO MOVE`
174			`BNE LOOPA CONTINUE UNTIL ALL VECTORS MOVED`
175			`*`
176			`* CONTENTS FROM TO FUNCTION`
177			`* $F8A1 $FE40 $DFC0 USER-V`
178			`* $F8A1 $FE42 $DFC2 SWI3-V`
179			`* $F8A1 $FE44 $DFC4 SWI2-V`
180			`* $F8A1 $FE46 $DFC6 FIRQ-V`
181			`* $F8A1 $FE48 $DFC8 IRQ-V`
182			`* $FAB0 $FE4A $DFCA SWI-V`
183			`* $FFFF $FE4C $DFCC SVC-VO`
184			`* $FFFF $FE4E $DFCE SVC-VL`
185			`*`
186			`LDX #ACIAS`
187			`STX CPORT STORE ADDR. IN RAM`
188			`LBSR XBKPNT CLEAR OUTSTANDING BREAKPOINTS`
189			`LDB #12 CLEAR 12 BYTES ON STACK`
190			`CLRSTK CLR ,-S`
191			`DECB`
192			`BNE CLRSTK`
193			`LEAX MONITOR,PCR SET PC TO SBUG-E ENTRY`
194			`STX 10,S ON STACK`
195			`LDA #$D0 PRESET CONDITION CODES ON STACK`
196			`STA ,S`
197			`TFR S,U`
198			`LBSR IOINIZ INITIALIZE CONTROL PORT`
199			`LDX #MSG1 POINT TO MONITOR MESSAGE`
200			`LBSR PDATA PRINT MSG`
201			`*`
202			`IFD DATOPT`
203			`LDX #LRARAM POINT TO LRA RAM STORAGE AREA`
204			`CLRA START TOTAL AT ZERO`
205			`LDB #13 TOTAL UP ALL ACTIVE RAM MEMORY`
206			`FNDREL TST B,X TEST FOR RAM AT NEXT LOC.`
207			`BEQ RELPAS IF NO RAM GO TO NEXT LOC.`
208			`ADDA #4 ELSE ADD 4K TO TOTAL`
209			`DAA ADJ. TOTAL FOR DECIMAL`
210			`RELPAS DECB SUB. 1 FROM LOCS. TO TEST`
211			`BPL FNDREL PRINT TOTAL OF RAM`
212			`LBSR OUT2H OUTPUT HEX BYTE AS ASCII`
213			`LDX #MSG2 POINT TO MSG 'K' CR/LF + 3 NULS`
214			`LBSR PDATA PRINT MSG`
215			`ENDIF DATOPT`
216			`*`
217			`IFD TRAOPT`
218			`LBSR TRAINZ`
219			`ENDIF TRAOPT`
220			`*`
221			`*** NEXTCMD ***`
222			`*`
223			`NEXTCMD LDX #MSG3 POINT TO MSG ">"`
224			`LBSR PSTRNG PRINT MSG`
225			`LBSR INCH GET ONE CHAR. FROM TERMINAL`
226			`ANDA #$7F STRIP PARITY FROM CHAR.`
227			`CMPA #$0D IS IT CARRIAGE RETURN ?`
228			`BEQ NEXTCMD IF CR THEN GET ANOTHER CHAR.`
229			`TFR A,B PUT CHAR. IN "B" ACCUM.`
230			`CMPA #$20 IS IT CONTROL OR DATA CHAR ?`
231			`BGE PRTCMD IF CMD CHAR IS DATA, PRNT IT`
232			`LDA #'^ ELSE CNTRL CHAR CMD SO...`
233			`LBSR OUTCH PRINT "^"`
234			`TFR B,A RECALL CNTRL CMD CHAR`
235			`ADDA #$40 CONVERT IT TO ASCII LETTER`
236			`PRTCMD LBSR OUTCH PRNT CMD CHAR`
237			`LBSR OUT1S PRNT SPACE`
238			`CMPB #$60`
239			`BLE NXTCH0`
240			`SUBB #$20`
241			`*`
242			`*** DO TABLE LOOKUP ***`
243			`* FOR COMMAND FUNCTIONS`
244			`*`
245			`NXTCH0 LDX #JMPTAB POINT TO JUMP TABLE`
246			`NXTCHR CMPB ,X+ DOES COMMAND MATCH TABLE ENTRY ?`
247			`BEQ JMPCMD BRANCH IF MATCH FOUND`
248			`LEAX 2,X POINT TO NEXT ENTRY IN TABLE`
249			`CMPX #TABEND REACHED END OF TABLE YET ?`
250			`BNE NXTCHR IF NOT END, CHECK NEXT ENTRY`
251			`LDX #MSG4 POINT TO MSG "WHAT?"`
252			`LBSR PDATA PRINT MSG`
253			`BRA NEXTCMD IF NO MATCH, PRMPT FOR NEW CMD`
254			`JMPCMD JSR [,X] JUMP TO COMMAND ROUTINE`
255			`BRA NEXTCMD PROMPT FOR NEW COMMAND`
256			`*`
257			`* "G" GO OR CONTINUE`
258			`*`
259			`GO TFR U,S`
260			`RTI RTI`
261			`*`
262			`*** "M" MEMORY EXAMINE AND CHANGE ***`
263			`*`
264			`MEMCHG LBSR IN1ADR INPUT ADDRESS`
265			`BVS CHRTN IF NOT HEX, RETURN`
266			`TFR X,Y SAVE ADDR IN "Y"`
267			`MEMC2 LDX #MSG5 POINT TO MSG " - "`
268			`LBSR PSTRNG PRINT MSG`
269			`TFR Y,X FETCH ADDRESS`
270			`LBSR OUT4H PRINT ADDR IN HEX`
271			`LBSR OUT1S OUTPUT SPACE`
272			`LDA ,Y GET CONTENTS OF CURRENT ADDR.`
273			`LBSR OUT2H OUTPUT CONTENTS IN ASCII`
274			`LBSR OUT1S OUTPUT SPACE`
275			`LBSR BYTE LOOP WAITING FOR OPERATOR INPUT`
276			`BVC CHANGE IF VALID HEX GO CHANGE MEM. LOC.`
277			`CMPA #8 IS IT A BACKSPACE (CNTRL H)?`
278			`BEQ MEMC2 PROMPT OPERATOR AGAIN`
279			`CMPA #$18 IS IT A CANCEL (CNTRL X)?`
280			`BEQ MEMC2 PROMPT OPERATOR AGAIN`
281			`CMPA #'^ IS IT AN UP ARROW?`
282			`BEQ BACK DISPLAY PREVIOUS BYTE`
283			`CMPA #$D IS IT A CR?`
284			`BNE FORWRD DISPLAY NEXT BYTE`
285			`CHRTN RTS EXIT ROUTINE`
286			`*`
287			`*`
288			`CHANGE STA ,Y CHANGE BYTE IN MEMORY`
289			`CMPA ,Y DID MEMORY BYTE CHANGE?`
290			`BEQ FORWRD $F972`
291			`LBSR OUT1S OUTPUT SPACE`
292			`LDA #'? LOAD QUESTION MARK`
293			`LBSR OUTCH PRINT IT`
294			`FORWRD LEAY 1,Y POINT TO NEXT HIGHER MEM LOCATION`
295			`BRA MEMC2 PRINT LOCATION & CONTENTS`
296			`BACK LEAY -1,Y POINT TO LAST MEM LOCATION`
297			`BRA MEMC2 PRINT LOCATION & CONTENTS`
298			`*`
299			`* "S" DISPLAY STACK`
300			`* HEX-ASCII DISPLAY OF CURRENT STACK CONTENTS FROM`
301			`** CURRENT STACK POINTER TO INTERNAL STACK LIMIT.`
302			`*`
303			`DISSTK LBSR PRTSP PRINT CURRENT STACK POINTER`
304			`TFR U,Y`
305			`LDX #STACK LOAD INTERNAL STACK AS UPPER LIMIT`
306			`LEAX -1,X POINT TO CURRENT STACK`
307			`BRA MDUMP1 ENTER MEMORY DUMP OF STACK CONTENTS`
308			`*`
309			`* "E" DUMP MEMORY FOR EXAMINE IN HEX AND ASCII`
310			`* AFTER CALLING 'IN2ADR' LOWER ADDRESS IN Y-REG.`
311			`* UPPER ADDRESS IN X-REG.`
312			`* IF HEX ADDRESSES ARE INVALID (V)=1.`
313			`*`
314			`MEMDUMP LBSR IN2ADR INPUT ADDRESS BOUNDRIES`
315			`BVS EDPRTN NEW COMMAND IF ILLEGAL HEX`
316			`MDUMP1 PSHS Y COMPARE LOWER TO UPPER BOUNDS`
317			`CMPX ,S++ LOWER BOUNDS > UPPER BOUNDS?`
318			`BCC AJDUMP IF NOT, DUMP HEX AND ASCII`
319			`EDPRTN RTS ;`
320			`*`
321			`* ADJUST LOWER AND UPPER ADDRESS LIMITS`
322			`* TO EVEN 16 BYTE BOUNDRIES.`
323			`*`
324			`* IF LOWER ADDR = $4532`
325			`* LOWER BOUNDS WILL BE ADJUSTED TO = $4530.`
326			`*`
327			`* IF UPPER ADDR = $4567`
328			`* UPPER BOUNDS WILL BE ADJUSTED TO = $4570.`
329			`*`
330			`* ENTER WITH LOWER ADDRESS IN X-REG.`
331			`* -UPPER ADDRESS ON TOP OF STACK.`
332			`*`
333			`AJDUMP TFR X,D GET UPPER ADDR IN D-REG`
334			`ADDD #$10 ADD 16 TO UPPER ADDRESS`
335			`ANDB #$F0 MASK TO EVEN 16 BYTE BOUNDRY`
336			`PSHS A,B SAVE ON STACK AS UPPER DUMP LIMIT`
337			`TFR Y,D $F9A5 GET LOWER ADDRESS IN D-REG`
338			`ANDB #$F0 MASK TO EVEN 16 BYTE BOUNDRY`
339			`TFR D,X PUT IN X-REG AS LOWER DUMP LIMIT`
340			`NXTLIN CMPX ,S COMPARE LOWER TO UPPER LIMIT`
341			`BEQ SKPDMP IF EQUAL SKIP HEX-ASCII DUMP`
342			`LBSR INCHEK CHECK FOR INPUT FROM KEYBOARD`
343			`BEQ EDUMP`
344			`SKPDMP LEAS 2,S READJUST STACK IF NOT DUMPING`
345			`RTS ;`
346			`*`
347			`* PRINT 16 HEX BYTES FOLLOWED BY 16 ASCII CHARACTERS`
348			`* FOR EACH LINE THROUGHOUT ADDRESS LIMITS.`
349			`*`
350			`EDUMP PSHS X PUSH LOWER ADDR LIMIT ON STACK`
351			`LDX #MSG5 POINT TO MSG " - "`
352			`LBSR PSTRNG PRINT MSG`
353			`LDX ,S LOAD LOWER ADDR FROM TOP OF STACK`
354			`LBSR OUT4H PRINT THE ADDRESS`
355			`LBSR OUT2S 2 SPACES`
356			`LDB #$10 LOAD COUNT OF 16 BYTES TO DUMP`
357			`ELOOP LDA ,X+ GET FROM MEMORY HEX BYTE TO PRINT`
358			`LBSR OUT2H OUTPUT HEX BYTE AS ASCII`
359			`LBSR OUT1S OUTPUT SPACE`
360			`DECB $F9D1 DECREMENT BYTE COUNT`
361			`BNE ELOOP CONTINUE TIL 16 HEX BYTES PRINTED`
362			`*`
363			`* PRINT 16 ASCII CHARACTERS`
364			`* IF NOT PRINTABLE OR NOT VALID`
365			`* ASCII PRINT A PERIOD (.)`
366			`LBSR OUT2S 2 SPACES`
367			`LDX ,S++ GET LOW LIMIT FRM STACK - ADJ STACK`
368			`LDB #$10 SET ASCII CHAR TO PRINT = 16`
369			`EDPASC LDA ,X+ GET CHARACTER FROM MEMORY`
370			`CMPA #$20 IF LESS THAN $20, NON-PRINTABLE?`
371			`BCS PERIOD IF SO, PRINT PERIOD INSTEAD`
372			`CMPA #$7E IS IT VALID ASCII?`
373			`BLS PRASC IF SO PRINT IT`
374			`PERIOD LDA #'. LOAD A PERIOD (.)`
375			`PRASC LBSR OUTCH PRINT ASCII CHARACTER`
376			`DECB DECREMENT COUNT`
377			`BNE EDPASC`
378			`BRA NXTLIN`
379			`*`
380			`*** "B" SET BREAKPOINT ***`
381			`*`
382			`BRKPNT LBSR IN1ADR GET BREAKPOINT ADDRESS`
383			`BVS EXITBP EXIT IF INVALID HEX ADDR.`
384			`CMPX #STACK ADDRESS ILLEGAL IF >=$DFC0`
385			`BCC BPERR IF ERROR PRINT (?), EXIT`
386			`PSHS X $FA82 PUSH BP ADDRESS ON STACK`
387			`LDX #$FFFF LOAD DUMMY ADDR TO TEST BP TABLE`
388			`BSR BPTEST TEST BP TABLE FOR FREE SPACE`
389			`PULS X POP BP ADDRESS FROM STACK`
390			`BEQ BPERR (Z) SET, OUT OF BP TABLE SPACE`
391			`LDA ,X GET DATA AT BREAKPOINT ADDRESS`
392			`CMPA #$3F IS IT A SWI?`
393			`BEQ BPERR IF SWI ALREADY, INDICATE ERROR`
394			`STA ,Y+ SAVE DATA BYTE IN BP TABLE`
395			`STX ,Y SAVE BP ADDRESS IN BP TABLE`
396			`LDA #$3F LOAD A SWI ($3F)`
397			`STA ,X SAVE SWI AT BREAKPOINT ADDRESS`
398			`EXITBP RTS ;`
399			`*`
400			`* INDICATE ERROR SETTING BREAKPOINT`
401			`*`
402			`BPERR LBSR OUT1S OUTPUT SPACE`
403			`LDA #'? LOAD (?), INDICATE BREAKPOINT ERROR`
404			`LBRA OUTCH PRINT "?"`
405			`*`
406			`* "X" CLEAR OUTSTANDING BREAKPOINTS *`
407			`*`
408			`XBKPNT LDY #BPTBL POINT TO BREAKPOINT TABLE`
409			`LDB #8 LOAD BREAKPOINT COUNTER`
410			`XBPLP BSR RPLSWI REMOVE USED ENTRY IN BP TABLE`
411			`DECB $FAAC DECREMENT BP COUNTER`
412			`BNE XBPLP END OF BREAKPOINT TABLE?`
413			`RTS`
414			`*`
415			`*** SWI ENTRY POINT ***`
416			`*`
417			`SWIE TFR S,U TRANSFER STACK TO USER POINTER`
418			`LDX 10,U LOAD PC FROM STACK INTO X-REG`
419			`LEAX -1,X ADJUST ADDR DOWN 1 BYTE.`
420			`BSR BPTEST FIND BREAKPOINT IN BP TABLE`
421			`BEQ REGPR IF FOUND, REPLACE DATA AT BP ADDR`
422			`STX 10,U SAVE BREAKPOINT ADDR IN STACK`
423			`BSR RPLSWI GO REPLACE SWI WITH ORIGINAL DATA`
424			`REGPR LBSR REGSTR GO PRINT REGISTERS`
425			`*`
426			`IFD TRAOPT`
427			`LDX #0`
428			`STX TRACNT`
429			`ENDIF TRAOPT`
430			`*`
431			`LBRA NEXTCMD GET NEXT COMMAND`
432			`*`
433			`RPLSWI LDX 1,Y LOAD BP ADDRESS FROM BP TABLE`
434			`CMPX #STACK COMPARE TO TOP AVAILABLE USER MEMORY`
435			`BCC FFSTBL GO RESET TABLE ENTRY TO $FF'S`
436			`LDA ,X GET DATA FROM BP ADDRESS`
437			`CMPA #$3F IS IT SWI?`
438			`BNE FFSTBL IF NOT, RESET TABLE ENTRY TO $FF'S`
439			`LDA ,Y GET ORIGINAL DATA FROM BP TABLE`
440			`STA ,X $FAD3 RESTORE DATA AT BP ADDRESS`
441			`FFSTBL LDA #$FF LOAD $FF IN A-ACC`
442			`STA ,Y+ RESET BREAKPOINT TABLE DATA TO $FF'S`
443			`STA ,Y+ RESET BREAKPOINT TABLE ADDR TO $FF'S`
444			`STA ,Y+`
445			`RTS`
446			`*`
447			` SEARCH BREAKPOINT TABLE FOR MATCH `
448			`*`
449			`BPTEST LDY #BPTBL POINT TO BREAKPOINT TABLE`
450			`LDB #8 LOAD BREAKPOINT COUNTER`
451			`FNDBP LDA ,Y+ LOAD DATA BYTE`
452			`CMPX ,Y++ COMPARE ADDRESS, IS IT SAME?`
453			`BEQ BPADJ IF SO, ADJUST POINTER FOR TABLE ENTRY`
454			`DECB IF NOT, DECREMENT BREAKPOINT COUNTER`
455			`BNE FNDBP AND LOOK FOR NEXT POSSIBLE MATCH`
456			`RTS ;`
457			`*`
458			`*`
459			`BPADJ LEAY -3,Y MOVE POINTER TO BEGIN OF BP ENTRY`
460			`RTS`
461			`*`
462			`IFD TRAOPT`
463			`*`
464			`** TRACE from address AAAA BB bytes`
465			`*`
466			`TRACE LBSR ALTPC1 SET UP NEW PC`
467			`BVS TREXIT ADDRESS ERROR, EXIT`
468			`LBSR OUT1S`
469			`LBSR IN1ADR Fetch Byte Count`
470			`BVS TREXIT Byte Count error, EXIT`
471			`STX TRACNT`
472			`*`
473			`LDX NMI Save NMI Vector`
474			`STX NMISAV`
475			`LDX #NMIE Set up NMI for Tracing`
476			`STX NMI`
477			`LBSR TRAINZ Initialise Hardware`
478			`BRA TRACEG Start Trace`
479			`TREXIT RTS`
480			`*`
481			`* CRA0 = 0 CA1 IRQ DISAB, CRA0 = 1 CA1 IRQ ENAB`
482			`* CRA1 = 1 CA1 Rising edge IRQ`
483			`* CRA2 = 0 TADATA = Data Direction, CRA2 = 1 TADATA = I/O Register`
484			`* CRA3 = 0 CA2 = 0 output, CRA3 = 1 CA2 = 1`
485			`* CRA4 = 1 ] CA2 = Set/Reset output`
486			`* CRA5 = 1 ]`
487			`* CRA6 = X CA2 Input Interrupt Flag`
488			`* CRA7 = X CA1 Interrupt Flag`
489			`*`
490			`* CRB0 = 0 CB1 IRQ DISAB, CRB0 = 1 CA1 IRQ ENAB`
491			`* CRB1 = 1 CB1 Rising edge IRQ`
492			`* CRB2 = 0 TBDATA = Data Direction, CRB2 = 1 TBDATA = I/O Register`
493			`* CRB3 = 0 CB2 = 0 output, CRB3 = 1 CB2 = 1`
494			`* CRB4 = 1 ] CB2 = Set/Reset output`
495			`* CRB5 = 1 ]`
496			`* CRB6 = X CB2 Input Interrupt Flag`
497			`* CRB7 = X CB1 Interrupt Flag`
498			`*`
499			`*`
500			`** TRACE NMI ENTRY POINT`

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