diff --git a/docs/cputypes/cpu 6502.txt b/docs/cputypes/cpu 6502.txt new file mode 100644 index 0000000..a51bfb0 --- /dev/null +++ b/docs/cputypes/cpu 6502.txt @@ -0,0 +1,84 @@ + + 6502 opcode table + +all empty entries are undocumented opcodes. +notice there are no documented opcodes in the fourth column. + + +00 brk 01 ora (zp, x) 02 03 +04 05 ora zp 06 asl zp 07 +08 php 09 ora #imm8 0a asl 0b +0c 0d ora abs16 0e asl abs16 0f +10 bpl rel8 11 ora (zp), y 12 13 +14 15 ora zp, x 16 asl zp, x 17 +18 clc 19 ora abs16, y 1a 1b +1c 1d ora abs16, x 1e asl abs16, x 1f + +20 jsr abs16 21 and (zp, x) 22 23 +24 bit zp 25 and zp 26 rol zp 27 +28 plp 29 and #imm8 2a rol 2b +2c bit abs16 2d and abs16 2e rol abs16 2f +30 bmi rel8 31 and (zp), y 32 33 +34 35 and zp, x 36 rol zp, x 37 +38 sec 39 and abs16, y 3a 3b +3c 3d and abs16, x 3e rol abs16, x 3f + +40 rti 41 eor (zp, x) 42 43 +44 45 eor zp 46 lsr zp 47 +48 pha 49 eor #imm8 4a lsr 4b +4c jmp abs16 4d eor abs16 4e lsr abs16 4f +50 bvc rel8 51 eor (zp), y 52 53 +54 55 eor zp, x 56 lsr zp, x 57 +58 cli 59 eor abs16, y 5a 5b +5c 5d eor abs16, x 5e lsr abs16, x 5f + +60 rts 61 adc (zp, x) 62 63 +64 65 adc zp 66 ror zp 67 +68 pla 69 adc #imm8 6a ror 6b +6c jmp (abs16) 6d adc abs16 6e ror abs16 6f +70 bvs rel8 71 adc (zp), y 72 73 +74 75 adc zp, x 76 ror zp, x 77 +78 sei 79 adc abs16, y 7a 7b +7c 7d adc abs16, x 7e ror abs16, x 7f + +80 81 sta (zp, x) 82 83 +84 sty zp 85 sta zp 86 stx zp 87 +88 dey 89 8a txa 8b +8c sty abs16 8d sta abs16 8e stx abs16 8f +90 bcc rel8 91 sta (zp), y 92 93 +94 sty zp, x 95 sta zp, x 96 stx zp, y 97 +98 tya 99 sta abs16, y 9a txs 9b +9c 9d sta abs16, x 9e 9f + +a0 ldy #imm8 a1 lda (zp, x) a2 ldx #imm8 a3 +a4 ldy zp a5 lda zp a6 ldx zp a7 +a8 tay a9 lda #imm8 aa tax ab +ac ldy abs16 ad lda abs16 ae ldx abs16 af +b0 bcs rel8 b1 lda (zp), y b2 b3 +b4 ldy zp, x b5 lda zp, x b6 ldx zp, y b7 +b8 clv b9 lda abs16, y ba tsx bb +bc ldy abs16, x bd lda abs16, x be ldx abs16, y bf + +c0 cpy #imm8 c1 cmp (zp, x) c2 c3 +c4 cpy zp c5 cmp zp c6 dec zp c7 +c8 iny c9 cmp #imm8 ca dex cb +cc cpy abs16 cd cmp abs16 ce dec abs16 cf +d0 bne rel8 d1 cmp (zp), y d2 d3 +d4 d5 cmp zp, x d6 dec zp, x d7 +d8 cld d9 cmp abs16, y da db +dc dd cmp abs16, x de dec abs16, x df + +e0 cpx #imm8 e1 sbc (zp, x) e2 e3 +e4 cpx zp e5 sbc zp e6 inc zp e7 +e8 inx e9 sbc #imm8 ea nop eb +ec cpx abs16 ed sbc abs16 ee inc abs16 ef +f0 beq rel8 f1 sbc (zp), y f2 f3 +f4 f5 sbc zp, x f6 inc zp, x f7 +f8 sed f9 sbc abs16, y fa fb +fc fd sbc abs16, x fe inc abs16, x ff + + +#imm8: 8-bit immediate value +zp: 8-bit zeropage address +abs16: 16-bit absolute address +rel8: 8-bit relative address offset