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vm6502/microchess.asm
Marek Karcz 67f1a62596 Version 2.0
Version 2.0, full emulation of 6502 op-codes, fully tested and functional. Extended description in ReadMe file. Bin2Hex tool to convert binary images to memory definition format. Microchess, EhBasic added.
2016-03-13 19:12:14 -04:00

1052 lines
31 KiB
NASM

;***********************************************************************
;
; MicroChess (c) 1996-2002 Peter Jennings, peterj@benlo.com
;
;***********************************************************************
; Daryl Rictor:
; I have been given permission to distribute this program by the
; author and copyright holder, Peter Jennings. Please get his
; permission if you wish to re-distribute a modified copy of
; this file to others. He specifically requested that his
; copyright notice be included in the source and binary images.
; Thanks!
;
; Marek Karcz:
; I have been given permission to distribute this program by the
; original author Peter Jennings under condition that I include
; link to his website in attribution.
; Here it is: http://www.benlo.com/microchess/index.html
; I did not bother to contact Daryl Rictor to ask permission to
; distribute his modifications to this software because according to
; the copyright notice on the web page of his project, permission is
; already given for personal non-commercial use:
; http://sbc.rictor.org/avr65c02.html
; http://sbc.rictor.org/download/AVR65C02.zip, readme.txt
; If this is incorrect or I misunderstood the author's intention,
; please note that I acted with no malicious intent and will remove
; this file from my project if I receive such request.
;
; To build this program with CL65:
;
; cl65 -C microchess.cfg -l --start-addr 1024 -t none -o microchess.bin
; microchess.asm
;
; Binary image microchess.bin can be loaded to emulator with 'L'
; command in debug console. Start emulator: mkbasic, then issue
; command in debug console:
; L B MICROCHESS.BIN
;
; Memory image definition file can be generated which can be loaded
; to emulator via command line argument and automatically executed.
; To create that file, build microchess.bin image, then execute:
;
; bin2hex -f microchess.bin -o microchess.dat -w 0 -x 1024 -z
;
; and add following lines at the end of microchess.dat file:
;
; IOADDR
; $E000
; ENIO
;
; Instructions to play:
;
; Load the game to emulator and auto-execute with command:
; mkbasic microchess.dat
; then perform following steps:
; 1. Press 'C' to setup board.
; 2. Enter your move: 4 digits - BBEE, BB - piece coordinates,
; EE - destination coordinates and press ENTER
; 3. After board is updated, press 'P' to make program make the move.
; 4. Repeat steps 2 and 3 until the game is finished.
;
;
; 1/14/2012
; Modified Daryl Rictor's port to run on MKHBC-8-R1 homebrew
; computer under MKHBCOS (derivative of M.O.S. by Scott
Chidester).
;
; 3/11/2016
; Adapted to run in MKBASIC (V65) emulator.
;
; 3/12/2016
; Modified UI behavior:
; - chess board is only printed after move, not after each
; keystroke
; - copyright banner is only printed once at the start
; of the program
;
; 6551 I/O Port Addresses
;
;ACIADat = $7F70
;ACIAsta = $7F71
;ACIACmd = $7F72
;ACIACtl = $7F73
; M.O.S. API defines (kernal) - OK for emulator, no changes
.define mos_StrPtr $E0
.define tmp_zpgPt $F6
; jumps, originally for M.O.S., now modified for emulator
.define mos_CallGetCh $FFED
.define mos_CallPutCh $FFF0
.define mos_CallPuts $FFF3
;
; page zero variables
;
BOARD = $50
BK = $60
PIECE = $B0
SQUARE = $B1
SP2 = $B2
SP1 = $B3
incHEK = $B4
STATE = $B5
MOVEN = $B6
REV = $B7
OMOVE = $2C
WCAP0 = $2D
COUNT = $2E
BCAP2 = $2E
WCAP2 = $2F
BCAP1 = $20
WCAP1 = $21
BCAP0 = $22
MOB = $23
MAXC = $24
CC = $25
PCAP = $26
BMOB = $23
BMAXC = $24
BMCC = $25 ; was bcc (TASS doesn't like it as a label)
BMAXP = $26
XMAXC = $28
WMOB = $2B
WMAXC = $3C
WCC = $3D
WMAXP = $3E
PMOB = $3F
PMAXC = $40
PCC = $41
PCP = $42
OLDKY = $43
BESTP = $4B
BESTV = $4A
BESTM = $49
DIS1 = $4B
DIS2 = $4A
DIS3 = $49
temp = $4C
;
;
;
.segment "BEGN"
.ORG $0000
.segment "CODE"
.ORG $0400 ; load into RAM @ $1000-$15FF
lda #$00 ; REVERSE TOGGLE
sta REV
jmp CHESS
PAINT: .byte $FF ; set this flag if board needs painting
; unset otherwise
PRNBANN:
.byte $FF ; set this flag to print copyright banner
;jsr Init_6551
CHESS: cld ; INITIALIZE
ldx #$FF ; TWO STACKS
txs
ldx #$C8
stx SP2
;
; ROUTINES TO LIGHT LED
; DISPLAY and GET KEY
; FROM KEYBOARD
;
OUT: jsr POUT ; DISPLAY and
jsr KIN ; GET INPUT *** my routine waits for a keypress
cmp #$43 ; [C]
bne NOSET ; SET UP
lda #$FF ; set PAINT flag
sta PAINT ; board needs to be diplayed
ldx #$1F ; BOARD
WHSET: lda SETW,X ; FROM
sta BOARD,X ; SETW
dex
bpl WHSET
ldx #$1B ; *ADDED
stx OMOVE ; INITS TO $FF
lda #$CC ; DISPLAY CCC
bne CLDSP
;
NOSET: cmp #$45 ; [E]
bne NOREV ; REVERSE
lda #$FF
sta PAINT
jsr REVERSE ; BOARD IS
sec
lda #$01
sbc REV
sta REV ; TOGGLE REV FLAG
lda #$EE ; IS
bne CLDSP
;
NOREV: cmp #$40 ; [P]
bne NOGO ; PLAY CHESS
lda #$FF
sta PAINT
jsr GO
CLDSP: sta DIS1 ; DISPLAY
sta DIS2 ; ACROSS
sta DIS3 ; DISPLAY
bne CHESS
;
NOGO: cmp #$0D ; [Enter]
bne NOMV ; MOVE MAN
pha
lda #$FF
sta PAINT
pla
jsr MOVE ; AS ENTERED
jmp DISP
NOMV: cmp #$41 ; [Q] ***Added to allow game exit***
beq DONE ; quit the game, exit back to system.
pha
lda #$00
sta PAINT
pla
jmp INPUT ; process move
DONE: rts
;jmp $FF00 ; *** MUST set this to YOUR OS starting address
;
; THE ROUTINE JANUS DIRECTS THE
; ANALYSIS BY DETERMINING WHAT
; SHOULD OCCUR AFTER EACH MOVE
; GENERATED BY GNM
;
;
;
JANUS: ldx STATE
bmi NOCOUNT
;
; THIS ROUTINE COUNTS OCCURRENCES
; IT DEPENDS UPON STATE TO INdex
; THE CORRECT COUNTERS
;
COUNTS: lda PIECE
beq OVER ; IF STATE=8
cpx #$08 ; DO NOT COUNT
bne OVER ; BLK MAX CAP
cmp BMAXP ; MOVES FOR
beq XRT ; WHITE
;
OVER: inc MOB,X ; MOBILITY
cmp #$01 ; + QUEEN
bne NOQ ; FOR TWO
inc MOB,X
;
NOQ: bvc NOCAP
ldy #$0F ; CALCULATE
lda SQUARE ; POINTS
ELOOP: cmp BK,Y ; CAPTURED
beq FOUN ; BY THIS
dey ; MOVE
bpl ELOOP
FOUN: lda POINTS,Y
cmp MAXC,X
bcc LESS ; SAVE IF
sty PCAP,X ; BEST THIS
sta MAXC,X ; STATE
;
LESS: clc
php ; ADD TO
adc CC,X ; CAPTURE
sta CC,X ; COUNTS
plp
;
NOCAP: cpx #$04
beq ON4
bmi TREE ;(=00 ONLY)
XRT: rts
;
; GENERATE FURTHER MOVES FOR COUNT
; and ANALYSIS
;
ON4: lda XMAXC ; SAVE ACTUAL
sta WCAP0 ; CAPTURE
lda #$00 ; STATE=0
sta STATE
jsr MOVE ; GENERATE
jsr REVERSE ; IMMEDIATE
jsr GNMZ ; REPLY MOVES
jsr REVERSE
;
lda #$08 ; STATE=8
sta STATE ; GENERATE
; jsr OHM ; CONTINUATION
jsr UMOVE ; MOVES
;
jmp STRATGY ; FINAL EVALUATION
NOCOUNT:cpx #$F9
bne TREE
;
; DETERMINE IF THE KING CAN BE
; TAKEN, USED BY CHKCHK
;
lda BK ; IS KING
cmp SQUARE ; IN CHECK?
bne RETJ ; SET incHEK=0
lda #$00 ; IF IT IS
sta incHEK
RETJ: rts
;
; IF A PIECE HAS BEEN CAPTURED BY
; A TRIAL MOVE, GENERATE REPLIES &
; EVALUATE THE EXCHANGE GAIN/LOSS
;
TREE: bvc RETJ ; NO CAP
ldy #$07 ; (PIECES)
lda SQUARE
LOOPX: cmp BK,Y
beq FOUNX
dey
beq RETJ ; (KING)
bpl LOOPX ; SAVE
FOUNX: lda POINTS,Y ; BEST CAP
cmp BCAP0,X ; AT THIS
bcc NOMAX ; LEVEL
sta BCAP0,X
NOMAX: dec STATE
lda #$FB ; IF STATE=FB
cmp STATE ; TIME TO TURN
beq UPTREE ; AROUND
jsr GENRM ; GENERATE FURTHER
UPTREE: inc STATE ; CAPTURES
rts
;
; THE PLAYER'S MOVE IS INPUT
;
INPUT: cmp #$08 ; NOT A LEGAL
bcs ERROR ; SQUARE #
jsr DISMV
DISP: ldx #$1F
SEARCH: lda BOARD,X
cmp DIS2
beq HERE ; DISPLAY
dex ; PIECE AT
bpl SEARCH ; FROM
HERE: stx DIS1 ; SQUARE
stx PIECE
ERROR: jmp CHESS
;
; GENERATE ALL MOVES FOR ONE
; SIDE, CALL JANUS AFTER EACH
; ONE FOR NEXT STE?
;
;
GNMZ: ldx #$10 ; CLEAR
GNMX: lda #$00 ; COUNTERS
CLEAR: sta COUNT,X
dex
bpl CLEAR
;
GNM: lda #$10 ; SET UP
sta PIECE ; PIECE
NEWP: dec PIECE ; NEW PIECE
bpl NEX ; ALL DONE?
rts ; #NAME?
;
NEX: jsr RESET ; READY
ldy PIECE ; GET PIECE
ldx #$08
stx MOVEN ; COMMON staRT
cpy #$08 ; WHAT IS IT?
bpl PAWN ; PAWN
cpy #$06
bpl KNIGHT ; KNIGHT
cpy #$04
bpl BISHOP ; BISHOP
cpy #$01
beq QUEEN ; QUEEN
bpl ROOK ; ROOK
;
KING: jsr SNGMV ; MUST BE KING!
bne KING ; MOVES
beq NEWP ; 8 TO 1
QUEEN: jsr LINE
bne QUEEN ; MOVES
beq NEWP ; 8 TO 1
;
ROOK: ldx #$04
stx MOVEN ; MOVES
AGNR: jsr LINE ; 4 TO 1
bne AGNR
beq NEWP
;
BISHOP: jsr LINE
lda MOVEN ; MOVES
cmp #$04 ; 8 TO 5
bne BISHOP
beq NEWP
;
KNIGHT: ldx #$10
stx MOVEN ; MOVES
AGNN: jsr SNGMV ; 16 TO 9
lda MOVEN
cmp #$08
bne AGNN
beq NEWP
;
PAWN: ldx #$06
stx MOVEN
P1: jsr CMOVE ; RIGHT CAP?
bvc P2
bmi P2
jsr JANUS ; YES
P2: jsr RESET
dec MOVEN ; LEFT CAP?
lda MOVEN
cmp #$05
beq P1
P3: jsr CMOVE ; AHEAD
bvs NEWP ; ILLEGAL
bmi NEWP
jsr JANUS
lda SQUARE ; GETS TO
and #$F0 ; 3RD RANK?
cmp #$20
beq P3 ; DO DOUBLE
jmp NEWP
;
; CALCULATE SINGLE STEP MOVES
; FOR K,N
;
SNGMV: jsr CMOVE ; CALC MOVE
bmi ILL1 ; -IF LEGAL
jsr JANUS ; -EVALUATE
ILL1: jsr RESET
dec MOVEN
rts
;
; CALCULATE ALL MOVES DOWN A
; STRAIGHT LINE FOR Q,B,R
;
LINE: jsr CMOVE ; CALC MOVE
bcc OVL ; NO CHK
bvc LINE ; NOCAP
OVL: bmi ILL ; RETURN
php
jsr JANUS ; EVALUATE POSN
plp
bvc LINE ; NOT A CAP
ILL: jsr RESET ; LINE STOPPED
dec MOVEN ; NEXT DIR
rts
;
; EXCHANGE SIDES FOR REPLY
; ANALYSIS
;
REVERSE:ldx #$0F
ETC: sec
ldy BK,X ; SUBTRACT
lda #$77 ; POSITION
sbc BOARD,X ; FROM 77
sta BK,X
sty BOARD,X ; and
sec
lda #$77 ; EXCHANGE
sbc BOARD,X ; PIECES
sta BOARD,X
dex
bpl ETC
rts
;
; CMOVE CALCULATES THE TO SQUARE
; USING SQUARE and THE MOVE
; TABLE FLAGS SET AS FOLLOWS:
; N#NAME? MOVE
; V#NAME? (LEGAL UNLESS IN CR)
; C#NAME? BECAUSE OF CHECK
; [MY &THANKS TO JIM BUTTERFIELD
; WHO WROTE THIS MORE EFFICIENT
; VERSION OF CMOVE)
;
CMOVE: lda SQUARE ; GET SQUARE
ldx MOVEN ; MOVE POINTER
clc
adc MOVEX,X ; MOVE LIST
sta SQUARE ; NEW POS'N
and #$88
bne ILLEGAL ; OFF BOARD
lda SQUARE
;
ldx #$20
LOOP: dex ; IS TO
bmi NO ; SQUARE
cmp BOARD,X ; OCCUPIED?
bne LOOP
;
cpx #$10 ; BY SELF?
bmi ILLEGAL
;
lda #$7F ; MUST BE CAP!
adc #$01 ; SET V FLAG
bvs SPX ; (jmp)
;
NO: clv ; NO CAPTURE
;
SPX: lda STATE ; SHOULD WE
bmi RETL ; DO THE
cmp #$08 ; CHECK CHECK?
bpl RETL
;
; CHKCHK REVERSES SIDES
; and LOOKS FOR A KING
; CAPTURE TO INDICATE
; ILLEGAL MOVE BECAUSE OF
; CHECK SincE THIS IS
; TIME CONSUMING, IT IS NOT
; ALWAYS DONE
;
CHKCHK: pha ; STATE #392
php
lda #$F9
sta STATE ; GENERATE
sta incHEK ; ALL REPLY
jsr MOVE ; MOVES TO
jsr REVERSE ; SEE IF KING
jsr GNM ; IS IN
jsr RUM ; CHECK
plp
pla
sta STATE
lda incHEK
bmi RETL ; NO - SAFE
sec ; YES - IN CHK
lda #$FF
rts
;
RETL: clc ; LEGAL
lda #$00 ; RETURN
rts
;
ILLEGAL:lda #$FF
clc ; ILLEGAL
clv ; RETURN
rts
;
; REPLACE PIECE ON CORRECT SQUARE
;
RESET: ldx PIECE ; GET LOGAT
lda BOARD,X ; FOR PIECE
sta SQUARE ; FROM BOARD
rts
;
;
;
GENRM: jsr MOVE ; MAKE MOVE
GENR2: jsr REVERSE ; REVERSE BOARD
jsr GNM ; GENERATE MOVES
RUM: jsr REVERSE ; REVERSE BACK
;
; ROUTINE TO UNMAKE A MOVE MADE BY
; MOVE
;
UMOVE: tsx ; UNMAKE MOVE
stx SP1
ldx SP2 ; EXCHANGE
txs ; STACKS
pla ; MOVEN
sta MOVEN
pla ; CAPTURED
sta PIECE ; PIECE
tax
pla ; FROM SQUARE
sta BOARD,X
pla ; PIECE
tax
pla ; TO SOUARE
sta SQUARE
sta BOARD,X
jmp STRV
;
; THIS ROUTINE MOVES PIECE
; TO SQUARE, PARAMETERS
; ARE SAVED IN A staCK TO UNMAKE
; THE MOVE LATER
;
MOVE: tsx
stx SP1 ; SWITCH
ldx SP2 ; STACKS
txs
lda SQUARE
pha ; TO SQUARE
tay
ldx #$1F
CHECK: cmp BOARD,X ; CHECK FOR
beq TAKE ; CAPTURE
dex
bpl CHECK
TAKE: lda #$CC
sta BOARD,X
txa ; CAPTURED
pha ; PIECE
ldx PIECE
lda BOARD,X
sty BOARD,X ; FROM
pha ; SQUARE
txa
pha ; PIECE
lda MOVEN
pha ; MOVEN
STRV: tsx
stx SP2 ; SWITCH
ldx SP1 ; STACKS
txs ; BACK
rts
;
; CONTINUATION OF SUB STRATGY
; -CHECKS FOR CHECK OR CHECKMATE
; and ASSIGNS VALUE TO MOVE
;
CKMATE: ldy BMAXC ; CAN BLK CAP
cpx POINTS ; MY KING?
bne NOCHEK
lda #$00 ; GULP!
beq RETV ; DUMB MOVE!
;
NOCHEK: ldx BMOB ; IS BLACK
bne RETV ; UNABLE TO
ldx WMAXP ; MOVE and
bne RETV ; KING IN CH?
lda #$FF ; YES! MATE
;
RETV: ldx #$04 ; RESTORE
stx STATE ; STATE=4
;
; THE VALUE OF THE MOVE (IN ACCU)
; IS COMPARED TO THE BEST MOVE and
; REPLACES IT IF IT IS BETTER
;
PUSH: cmp BESTV ; IS THIS BEST
bcc RETP ; MOVE SO FAR?
beq RETP
sta BESTV ; YES!
lda PIECE ; SAVE IT
sta BESTP
lda SQUARE
sta BESTM ; FLASH DISPLAY
RETP: lda #'.' ; print ... instead of flashing disp
jmp syschout ; print . and return
;
; MAIN PROGRAM TO PLAY CHESS
; PLAY FROM OPENING OR THINK
;
GO: ldx OMOVE ; OPENING?
bmi NOOPEN ; -NO *ADD CHANGE FROM bpl
lda DIS3 ; -YES WAS
cmp OPNING,X ; OPPONENT'S
bne END ; MOVE OK?
dex
lda OPNING,X ; GET NEXT
sta DIS1 ; CANNED
dex ; OPENING MOVE
lda OPNING,X
sta DIS3 ; DISPLAY IT
dex
stx OMOVE ; MOVE IT
bne MV2 ; (jmp)
;
END: lda #$FF ; *ADD - STOP CANNED MOVES
sta OMOVE ; FLAG OPENING
NOOPEN: ldx #$0C ; FINISHED
stx STATE ; STATE=C
stx BESTV ; CLEAR BESTV
ldx #$14 ; GENERATE P
jsr GNMX ; MOVES
;
ldx #$04 ; STATE=4
stx STATE ; GENERATE and
jsr GNMZ ; TEST AVAILABLE
;
; MOVES
;
ldx BESTV ; GET BEST MOVE
cpx #$0F ; IF NONE
bcc MATE ; OH OH!
;
MV2: ldx BESTP ; MOVE
lda BOARD,X ; THE
sta BESTV ; BEST
stx PIECE ; MOVE
lda BESTM
sta SQUARE ; and DISPLAY
jsr MOVE ; IT
jmp CHESS
;
MATE: lda #$FF ; RESIGN
rts ; OR staLEMATE
;
; SUBROUTINE TO ENTER THE
; PLAYER'S MOVE
;
DISMV: ldx #$04 ; ROTATE
Drol: asl DIS3 ; KEY
rol DIS2 ; INTO
dex ; DISPLAY
bne Drol ;
ora DIS3
sta DIS3
sta SQUARE
rts
;
; THE FOLLOWING SUBROUTINE ASSIGNS
; A VALUE TO THE MOVE UNDER
; CONSIDERATION and RETURNS IT IN
; THE ACCUMULATOR
;
STRATGY:clc
lda #$80
adc WMOB ; PARAMETERS
adc WMAXC ; WITH WHEIGHT
adc WCC ; OF O25
adc WCAP1
adc WCAP2
sec
sbc PMAXC
sbc PCC
sbc BCAP0
sbc BCAP1
sbc BCAP2
sbc PMOB
sbc BMOB
bcs POS ; UNDERFLOW
lda #$00 ; PREVENTION
POS: lsr
clc ; **************
adc #$40
adc WMAXC ; PARAMETERS
adc WCC ; WITH WEIGHT
sec ; OF 05
sbc BMAXC
lsr ; **************
clc
adc #$90
adc WCAP0 ; PARAMETERS
adc WCAP0 ; WITH WEIGHT
adc WCAP0 ; OF 10
adc WCAP0
adc WCAP1
sec ; [UNDER OR OVER-
sbc BMAXC ; FLOW MAY OCCUR
sbc BMAXC ; FROM THIS
sbc BMCC ; secTION]
sbc BMCC
sbc BCAP1
ldx SQUARE ; ***************
cpx #$33
beq POSN ; POSITION
cpx #$34 ; BONUS FOR
beq POSN ; MOVE TO
cpx #$22 ; CENTRE
beq POSN ; OR
cpx #$25 ; OUT OF
beq POSN ; BACK RANK
ldx PIECE
beq NOPOSN
ldy BOARD,X
cpy #$10
bpl NOPOSN
POSN: clc
adc #$02
NOPOSN: jmp CKMATE ; CONTINUE
;-----------------------------------------------------------------
; The following routines were added to allow text-based board
; DISPLAY over a standard RS-232 port.
;
POUT: lda PAINT
bne POUT0
rts ; return if PAINT flag = 0
POUT0: jsr POUT9 ; print CRLF
jsr POUT13 ; print copyright
jsr POUT10 ; print column labels
ldy #$00 ; init board location
jsr POUT5 ; print board horz edge
POUT1: lda #'|' ; print vert edge
jsr syschout ; PRINT ONE ASCII CHR - SPACE
ldx #$1F
POUT2: tya ; scan the pieces for a location match
cmp BOARD,X ; match found?
beq POUT4 ; yes; print the piece's color and type
dex ; no
bpl POUT2 ; if not the last piece, try again
tya ; empty square
and #$01 ; odd or even column?
sta temp ; save it
tya ; is the row odd or even
lsr ; shift column right 4 spaces
lsr ;
lsr ;
lsr ;
and #$01 ; strip LSB
clc ;
adc temp ; combine row & col to determine square color
and #$01 ; is board square white or blk?
bne POUT25 ; white, print space
lda #'*' ; black, print *
.byte $2c ; used to skip over lda #$20
;jmp POUT25A
POUT25: lda #$20 ; ASCII space
POUT25A:jsr syschout ; PRINT ONE ASCII CHR - SPACE
jsr syschout ; PRINT ONE ASCII CHR - SPACE
POUT3: iny ;
tya ; get row number
and #$08 ; have we completed the row?
beq POUT1 ; no, do next column
lda #'|' ; yes, put the right edge on
jsr syschout ; PRINT ONE ASCII CHR - |
jsr POUT12 ; print row number
jsr POUT9 ; print CRLF
jsr POUT5 ; print bottom edge of board
clc ;
tya ;
adc #$08 ; point y to beginning of next row
tay ;
cpy #$80 ; was that the last row?
beq POUT8 ; yes, print the LED values
bne POUT1 ; no, do new row
POUT4: lda REV ; print piece's color & type
beq POUT41 ;
lda cpl+16,X ;
bne POUT42 ;
POUT41: lda cpl,x ;
POUT42: jsr syschout ;
lda cph,x ;
jsr syschout ;
bne POUT3 ; branch always
POUT5: txa ; print "-----...-----<crlf>"
pha
ldx #$19
lda #'-'
POUT6: jsr syschout ; PRINT ONE ASCII CHR - "-"
dex
bne POUT6
pla
tax
jsr POUT9
rts
POUT8: jsr POUT10 ;
lda BESTP
jsr syshexout ; PRINT 1 BYTE AS 2 HEX CHRS
lda #$20
jsr syschout ; PRINT ONE ASCII CHR - SPACE
lda BESTV
jsr syshexout ; PRINT 1 BYTE AS 2 HEX CHRS
lda #$20
jsr syschout ; PRINT ONE ASCII CHR - SPACE
lda DIS3
jsr syshexout ; PRINT 1 BYTE AS 2 HEX CHRS
POUT9: lda #$0D
jsr syschout ; PRINT ONE ASCII CHR - CR
lda #$0A
jsr syschout ; PRINT ONE ASCII CHR - LF
rts
POUT10: ldx #$00 ; print the column labels
POUT11: lda #$20 ; 00 01 02 03 ... 07 <CRLF>
jsr syschout
txa
jsr syshexout
inx
cpx #$08
bne POUT11
beq POUT9
POUT12: tya
and #$70
jsr syshexout
rts
; print banner only once, preserve registers A, X, Y
POUT13: stx tmp_zpgPt
sta tmp_zpgPt+1
sty tmp_zpgPt+2
lda PRNBANN
beq NOPRNBANN
lda #<banner
sta mos_StrPtr
lda #>banner
sta mos_StrPtr+1
jsr mos_CallPuts
NOPRNBANN:
lda #$00
sta PRNBANN
ldx tmp_zpgPt
lda tmp_zpgPt+1
ldy tmp_zpgPt+2
rts
; ldx #$00 ; Print the copyright banner
;POUT14: lda banner,x
; beq POUT15
; jsr syschout
; inx
; bne POUT14
;POUT15: rts
KIN: lda #'?'
jsr syschout ; PRINT ONE ASCII CHR - ?
jsr syskin ; GET A KEYSTROKE FROM SYSTEM
jsr syschout ; echo entered character
and #$4F ; MASK 0-7, and ALpha'S
rts
;
; 6551 I/O Support Routines
;
;
;Init_6551 lda #$1F ; 19.2K/8/1
; sta ACIActl ; control reg
; lda #$0B ; N parity/echo off/rx int off/ dtr active low
; sta ACIAcmd ; command reg
; rts ; done
;
; input chr from ACIA1 (waiting)
;
syskin:
jsr mos_CallGetCh
rts
;lda ACIAsta ; Serial port status
;and #$08 ; is recvr full
;beq syskin ; no char to get
;lda ACIAdat ; get chr
;rts ;
;
; output to OutPut Port
;
syschout: ; MKHBCOS: must preserve X, Y and A
stx tmp_zpgPt
sta tmp_zpgPt+1
;sty tmp_zpgPt+2
jsr mos_CallPutCh
ldx tmp_zpgPt
lda tmp_zpgPt+1
;ldy tmp_zpgPt+2
rts
; pha ; save registers
;ACIA_Out1 lda ACIAsta ; serial port status
; and #$10 ; is tx buffer empty
; beq ACIA_Out1 ; no
; pla ; get chr
; sta ACIAdat ; put character to Port
; rts ; done
syshexout: pha ; prints AA hex digits
lsr ; MOVE UPPER NIBBLE TO LOWER
lsr ;
lsr ;
lsr ;
jsr PrintDig ;
pla ;
PrintDig:
sty tmp_zpgPt+2
and #$0F ;
tay ;
lda Hexdigdata,Y ;
ldy tmp_zpgPt+2 ;
jmp syschout ;
Hexdigdata: .byte "0123456789ABCDEF"
banner: .byte "MicroChess (c) 1996-2002 Peter Jennings, peterj@benlo.com"
.byte $0d, $0a, $00
cpl: .byte "WWWWWWWWWWWWWWWWBBBBBBBBBBBBBBBBWWWWWWWWWWWWWWWW"
cph: .byte "KQCCBBRRPPPPPPPPKQCCBBRRPPPPPPPP"
.byte $00
;
; end of added code
;
; BLOCK DATA
.segment "DATA"
.ORG $0A20
SETW: .byte $03, $04, $00, $07, $02, $05, $01, $06
.byte $10, $17, $11, $16, $12, $15, $14, $13
.byte $73, $74, $70, $77, $72, $75, $71, $76
.byte $60, $67, $61, $66, $62, $65, $64, $63
MOVEX: .byte $00, $F0, $FF, $01, $10, $11, $0F, $EF, $F1
.byte $DF, $E1, $EE, $F2, $12, $0E, $1F, $21
POINTS: .byte $0B, $0A, $06, $06, $04, $04, $04, $04
.byte $02, $02, $02, $02, $02, $02, $02, $02
OPNING: .byte $99, $25, $0B, $25, $01, $00, $33, $25
.byte $07, $36, $34, $0D, $34, $34, $0E, $52
.byte $25, $0D, $45, $35, $04, $55, $22, $06
.byte $43, $33, $0F, $CC
.segment "KERN"
.ORG $FE00
CHRIN: lda $E000
rts
CHROUT: sta $E000
rts
; this function was shamelessly ripped :-) from M.O.S. code (c) by Scott Chidester
STROUT:
ldy #0 ; Non-indexed variant starts at zero, of course
lda mos_StrPtr+1 ; Save StrPtr so it isn't modified
pha
PutsLoop:
lda (mos_StrPtr),y ; Get the next char in the string
beq PutsDone ; Zero means end of string
jsr CHROUT ; Otherwise put the char
; Update string pointer
iny ; increment StrPtr-lo
bne PutsLoop ; No rollover? Loop back for next character
inc mos_StrPtr+1 ; StrPtr-lo rolled over--carry hi byte
jmp PutsLoop ; Now loop back
PutsDone:
pla
sta mos_StrPtr+1 ; Restore StrPtr
rts
.segment "VECT"
.ORG $FFED
jmp CHRIN
jmp CHROUT
jmp STROUT
;
;
; end of file
;