VolksForth/sources/Apple1/as65.fth

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2020-08-25 16:55:03 +00:00
\ *** Block No. 0 Hexblock 0
\ FORTH-6502 ASSEMBLER WFR ) cas 26jan06
( BASIS: FORTH DIMENSIONS VOL III NO. 5)
Load from Screen 1 for the transient assembler:
This 6502 Forth Assembler can be loaded into the heap
and then not be saved in the final binary to save memory.
Load from Screen 2 for the regular assembler:
This 6502 Forth Assembler will be loaded into normal
memory and will be saved into the final binary.
\ *** Block No. 1 Hexblock 1
\ TRANSIENT FORTH-6502 ASSEMBLER WFR ) er14dez88
( BASIS: FORTH DIMENSIONS VOL III NO. 5)
( INTERNAL LOADING 04MAY85BP/RE)
hex
\ HERE $200 HALLOT HEAP DP !
&10 LOAD
&11 LOAD
3 &8 THRU
&9 LOAD \ for System-Assembler
\ DP !
ONLYFORTH
decimal
\ *** Block No. 2 Hexblock 2
\ FORTH-65 ASSEMBLER WFR ) er14dez88
( BASIS: FORTH DIMENSIONS VOL III NO. 5)
ONLYFORTH
Vocabulary tassembler
TASSEMBLER ALSO DEFINITIONS
hex
8 +load \ relocate
1 6 +THRU
\ 7 +load \ System Assembler
decimal
\ *** Block No. 3 Hexblock 3
\ FORTH-83 6502-ASSEMBLER ) er14dez88
: END-CODE CONTEXT 2- @ CONTEXT ! ;
CREATE INDEX
09 c, 09 c, 05 c, 15 c, 15 c, 01 c, 11 c, 80 c,
09 c, 80 c, 0D c, 1D c, 19 c, 80 c, 80 c, 80 c,
80 c, 00 c, 04 c, 14 c, 14 c, 80 c, 80 c, 80 c,
80 c, 80 c, 0C c, 1C c, 1C c, 80 c, 80 c, 2C c,
| VARIABLE MODE
: MODE: ( N -) CREATE C, DOES> ( -) C@ MODE ! ;
0 MODE: .A 1 MODE: # 2 | MODE: MEM 3 MODE: ,X
4 MODE: ,Y 5 MODE: X) 6 MODE: )Y 0F MODE: )
6 MODE: )Y 0F MODE: ) 6 MODE: )Y 0F MODE: )
6 MODE: )Y 0F MODE: ) 6 MODE: )Y 0F MODE: )
\ *** Block No. 4 Hexblock 4
\ UPMODE CPU ) er14dez88
| : UPMODE ( ADDR0 F0 - ADDR1 F1)
IF MODE @ 8 OR MODE ! THEN 1 MODE @ 0F AND ?DUP IF
0 DO DUP + LOOP THEN OVER 1+ @ AND 0= ;
: CPU ( 8B -) CREATE C, DOES> ( -) C@ >c, MEM ;
00 CPU BRK 18 CPU CLC D8 CPU CLD
58 CPU CLI B8 CPU CLV CA CPU DEX
88 CPU DEY E8 CPU INX C8 CPU INY
EA CPU NOP 48 CPU PHA 08 CPU PHP
68 CPU PLA 28 CPU PLP 40 CPU RTI
60 CPU RTS 38 CPU SEC F8 CPU SED
78 CPU SEI AA CPU TAX A8 CPU TAY
BA CPU TSX 8A CPU TXA 9A CPU TXS
98 CPU TYA
\ *** Block No. 5 Hexblock 5
\ M/CPU ) er14dez88
: M/CPU ( MODE OPCODE -) CREATE C, , DOES>
DUP 1+ @ 80 AND IF 10 MODE +! THEN OVER FF00 AND UPMODE UPMODE
IF MEM TRUE ABORT" INVALID" THEN
C@ MODE @ INDEX + C@ + >c, MODE @ 7 AND
IF MODE @ 0F AND 7 < IF >c, ELSE >, THEN THEN MEM ;
1C6E 60 M/CPU ADC 1C6E 20 M/CPU AND 1C6E C0 M/CPU CMP
1C6E 40 M/CPU EOR 1C6E A0 M/CPU LDA 1C6E 00 M/CPU ORA
1C6E E0 M/CPU SBC 1C6C 80 M/CPU STA 0D0D 01 M/CPU ASL
0C0C C1 M/CPU DEC 0C0C E1 M/CPU INC 0D0D 41 M/CPU LSR
0D0D 21 M/CPU ROL 0D0D 61 M/CPU ROR 0414 81 M/CPU STX
0486 E0 M/CPU CPX 0486 C0 M/CPU CPY 1496 A2 M/CPU LDX
0C8E A0 M/CPU LDY 048C 80 M/CPU STY 0480 14 M/CPU JSR
8480 40 M/CPU JMP 0484 20 M/CPU BIT
\ *** Block No. 6 Hexblock 6
\ ASSEMBLER CONDITIONALS ) er14dez88
| : RANGE? ( BRANCH -- BRANCH )
DUP ABS 07F U> ABORT" OUT OF RANGE " ;
: [[ ( BEGIN) >here ;
: ?] ( UNTIL) >c, >here 1+ - RANGE? >c, ;
: ?[ ( IF) >c, >here 0 >c, ;
: ?[[ ( WHILE) ?[ SWAP ;
: ]? ( THEN) >here OVER >c@ IF SWAP >!
ELSE OVER 1+ - RANGE? SWAP >c! THEN ;
: ][ ( ELSE) >here 1+ 1 JMP
SWAP >here OVER 1+ - RANGE? SWAP >c! ;
: ]] ( AGAIN) JMP ;
: ]]? ( REPEAT) JMP ]? ;
\ *** Block No. 7 Hexblock 7
\ ASSEMBLER CONDITIONALS ) er14dez88
90 CONSTANT CS B0 CONSTANT CC
D0 CONSTANT 0= F0 CONSTANT 0<>
10 CONSTANT 0< 30 CONSTANT 0>=
50 CONSTANT VS 70 CONSTANT VC
: NOT 20 [ FORTH ] XOR ;
: BEQ 0<> ?] ; : BMI 0>= ?] ;
: BNE 0= ?] ; : BPL 0< ?] ;
: BCC CS ?] ; : BVC VS ?] ;
: BCS CC ?] ; : BVS VC ?] ;
\ *** Block No. 8 Hexblock 8
\ 2INC/2DEC WINC/WDEC KS 19 MAY 84 ) er14dez88
: 2INC
DUP LDA CLC 2 # ADC DUP STA CS ?[ SWAP 1+ INC ]? ;
: 2DEC
DUP LDA SEC 2 # SBC DUP STA CC ?[ SWAP 1+ DEC ]? ;
: WINC DUP INC 0= ?[ SWAP 1+ INC ]? ;
: WDEC DUP LDA 0= ?[ OVER 1+ DEC ]? DEC ;
: ;C: RECOVER JSR END-CODE ] 0 LAST ! 0 ;
\ *** Block No. 9 Hexblock 9
\ ;CODE CODE CODE> BP 03 02 85) er14dez88
ONLYFORTH
: ASSEMBLER ASSEMBLER [ ASSEMBLER ] MEM ;
: ;CODE [COMPILE] DOES> -3 >allot
[COMPILE] ; -2 >allot ASSEMBLER ; IMMEDIATE
: CODE CREATE >here DUP 2- >! ASSEMBLER ;
: >LABEL ( ADR -)
>here | CREATE SWAP , 4 HALLOT
HEAP 1 AND HALLOT ( 6502-ALIGN) HERE 4 - HEAP 4 CMOVE
HEAP LAST @ COUNT 01F AND + ! DP ! DOES> ( - ADR) @ ;
: LABEL [ ASSEMBLER ] >here >LABEL ASSEMBLER ;
\ *** Block No. 10 Hexblock A
\ Code generating primitives er14dez88
Variable >codes
| Create nrc ] c, , c@ here allot ! c! [
: nonrelocate nrc >codes ! ; nonrelocate
| : >exec Create c,
Does> c@ >codes @ + @ execute ;
| 0 >exec >c, | 2 >exec >, | 4 >exec >c@
| 6 >exec >here | 8 >exec >allot | $0A >exec >!
| $0C >exec >c!
\ *** Block No. 11 Hexblock B
\ FORTH-65 ASSEMBLER WFR ) er14dez88
( BASIS: FORTH DIMENSIONS VOL III NO. 5)
ONLYFORTH
ASSEMBLER ALSO DEFINITIONS