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151 lines
3.8 KiB
Plaintext
Executable File
151 lines
3.8 KiB
Plaintext
Executable File
\ 6502 Assembler clv10oct87
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\ Basis: Forth Dimensions VOL III No. 5)
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\ internal loading 04may85BP/re)
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\ Forth-6502 Assembler clv10oct87
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\ Basis: Forth Dimensions VOL III No. 5)
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CR .( Loading 6502 Assembler...) CR
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Onlyforth Assembler also definitions
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\ Forth-83 6502-Assembler 20oct87re
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: end-code context 2- @ context ! ;
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Create index
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$0909 , $1505 , $0115 , $8011 ,
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$8009 , $1D0D , $8019 , $8080 ,
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$0080 , $1404 , $8014 , $8080 ,
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$8080 , $1C0C , $801C , $2C80 ,
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| Variable mode
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: Mode: ( n -) Create c,
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Does> ( -) c@ mode ! ;
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0 Mode: .A 1 Mode: #
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2 | Mode: mem 3 Mode: ,X
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4 Mode: ,Y 5 Mode: X)
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6 Mode: )Y $F Mode: )
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\ upmode cpu 20oct87re
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| : upmode ( addr0 f0 - addr1 f1)
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IF mode @ 8 or mode ! THEN
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1 mode @ $F and ?dup IF
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0 DO dup + LOOP THEN
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over 1+ @ and 0= ;
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: cpu ( 8b -) Create c,
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Does> ( -) c@ c, mem ;
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00 cpu brk $18 cpu clc $D8 cpu cld
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$58 cpu cli $B8 cpu clv $CA cpu dex
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$88 cpu dey $E8 cpu inx $C8 cpu iny
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$EA cpu nop $48 cpu pha $08 cpu php
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$68 cpu pla $28 cpu plp $40 cpu rti
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$60 cpu rts $38 cpu sec $F8 cpu sed
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$78 cpu sei $AA cpu tax $A8 cpu tay
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$BA cpu tsx $8A cpu txa $9A cpu txs
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$98 cpu tya
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\ m/cpu 20oct87re
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: m/cpu ( mode opcode -) Create c, ,
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Does>
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dup 1+ @ $80 and IF $10 mode +! THEN
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over $FF00 and upmode upmode
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IF mem true Abort" invalid" THEN
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c@ mode @ index + c@ + c, mode @ 7 and
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IF mode @ $F and 7 <
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IF c, ELSE , THEN THEN mem ;
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$1C6E $60 m/cpu adc $1C6E $20 m/cpu and
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$1C6E $C0 m/cpu cmp $1C6E $40 m/cpu eor
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$1C6E $A0 m/cpu lda $1C6E $00 m/cpu ora
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$1C6E $E0 m/cpu sbc $1C6C $80 m/cpu sta
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$0D0D $01 m/cpu asl $0C0C $C1 m/cpu dec
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$0C0C $E1 m/cpu inc $0D0D $41 m/cpu lsr
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$0D0D $21 m/cpu rol $0D0D $61 m/cpu ror
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$0414 $81 m/cpu stx $0486 $E0 m/cpu cpx
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$0486 $C0 m/cpu cpy $1496 $A2 m/cpu ldx
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$0C8E $A0 m/cpu ldy $048C $80 m/cpu sty
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$0480 $14 m/cpu jsr $8480 $40 m/cpu jmp
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$0484 $20 m/cpu bit
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\ Assembler conditionals 20oct87re
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| : range? ( branch -- branch )
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dup abs $7F u> Abort" out of range " ;
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: [[ ( BEGIN) here ;
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: ?] ( UNTIL) c, here 1+ - range? c, ;
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: ?[ ( IF) c, here 0 c, ;
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: ?[[ ( WHILE) ?[ swap ;
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: ]? ( THEN) here over c@ IF swap !
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ELSE over 1+ - range? swap c! THEN ;
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: ][ ( ELSE) here 1+ 1 jmp
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swap here over 1+ - range? swap c! ;
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: ]] ( AGAIN) jmp ;
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: ]]? ( REPEAT) jmp ]? ;
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\ Assembler conditionals 20oct87re
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$90 Constant CS $B0 Constant CC
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$D0 Constant 0= $F0 Constant 0<>
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$10 Constant 0< $30 Constant 0>=
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$50 Constant VS $70 Constant VC
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: not $20 [ Forth ] xor ;
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: beq 0<> ?] ; : bmi 0>= ?] ;
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: bne 0= ?] ; : bpl 0< ?] ;
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: bcc CS ?] ; : bvc VS ?] ;
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: bcs CC ?] ; : bvs VC ?] ;
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\ 2inc/2dec winc/wdec 20oct87re
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: 2inc ( adr -- )
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dup lda clc 2 # adc
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dup sta CS ?[ swap 1+ inc ]? ;
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: 2dec ( adr -- )
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dup lda sec 2 # sbc
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dup sta CC ?[ swap 1+ dec ]? ;
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: winc ( adr -- )
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dup inc 0= ?[ swap 1+ inc ]? ;
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: wdec ( adr -- )
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dup lda 0= ?[ over 1+ dec ]? dec ;
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: ;c:
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recover jsr end-code ] 0 last ! 0 ;
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\ ;code Code code> bp/re03feb85
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Onlyforth
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: Assembler
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Assembler [ Assembler ] mem ;
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: ;Code
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[compile] Does> -3 allot
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[compile] ; -2 allot Assembler ;
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immediate
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: Code Create here dup 2- ! Assembler ;
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: >label ( adr -)
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here | Create immediate swap ,
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4 hallot heap 1 and hallot ( 6502-alig)
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here 4 - heap 4 cmove
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heap last @ count $1F and + ! dp !
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Does> ( - adr) @
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state @ IF [compile] Literal THEN ;
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: Label
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[ Assembler ] here >label Assembler ;
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Onlyforth
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