VolksForth/6502/py65/as65.fb

\           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.                                                                                                                                                                                                                                                                                                                                                                                                                 \ 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                                                                                                                         \ 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                                                                                                                                                                                                                                                                                                                                                                                         \ 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: )   \ 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                                                     \ 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                          \ 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 ]? ;                                                                                                        \ 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  ?] ;                                                                                                                                                                                                                            \ 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 ;                                                                                                                                                                                                                  \ ;CODE CODE CODE>          BP 03 02 85)               er14dez88ONLYFORTH                                                                                                                       : 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 ;                 \ 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!                                                                                                                                                                                                                                                 \ FORTH-65 ASSEMBLER               WFR )               er14dez88( BASIS: FORTH DIMENSIONS VOL III NO. 5)                        ONLYFORTH                                                                                                                       ASSEMBLER ALSO DEFINITIONS