6502 Instruction Set: Opcode map

Introduction

The row is the high nibble of the opcode and the column the low nibble: the cell at row B, column D is opcode BD. Each cell gives the mnemonic and the addressing mode: imp implied, acc accumulator, imm immediate, zp zero page, zpx and zpy zero page indexed, abs absolute, abx and aby absolute indexed, ind indirect, izx (zp,X), izy (zp),Y, rel relative, izp (zp), iax (abs,X) and zpr zero page and relative.

The status of each opcode is shown by its colour and, so that colour is not the only sign, by the marker after the cell’s text: nothing for documented, u for undocumented, ? for unstable and jam for an opcode that stops the processor. The overview explains the four statuses.

The mode gives the length: implied and accumulator 1 byte; immediate, zero page, (zp,X), (zp),Y, (zp) and relative 2 bytes; absolute, indirect, (abs,X) and zero page and relative 3 bytes.

NMOS 6502, 6510 and 2A03

151 documented opcodes, 85 undocumented, 8 unstable and 12 that jam. The 6510 and 2A03 decode identically.

	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
0	brk imp	ora izx	kil jam	slo izx u	nop zp u	ora zp	asl zp	slo zp u	php imp	ora imm	asl acc	anc imm u	nop abs u	ora abs	asl abs	slo abs u
1	bpl rel	ora izy	kil jam	slo izy u	nop zpx u	ora zpx	asl zpx	slo zpx u	clc imp	ora aby	nop imp u	slo aby u	nop abx u	ora abx	asl abx	slo abx u
2	jsr abs	and izx	kil jam	rla izx u	bit zp	and zp	rol zp	rla zp u	plp imp	and imm	rol acc	anc imm u	bit abs	and abs	rol abs	rla abs u
3	bmi rel	and izy	kil jam	rla izy u	nop zpx u	and zpx	rol zpx	rla zpx u	sec imp	and aby	nop imp u	rla aby u	nop abx u	and abx	rol abx	rla abx u
4	rti imp	eor izx	kil jam	sre izx u	nop zp u	eor zp	lsr zp	sre zp u	pha imp	eor imm	lsr acc	alr imm u	jmp abs	eor abs	lsr abs	sre abs u
5	bvc rel	eor izy	kil jam	sre izy u	nop zpx u	eor zpx	lsr zpx	sre zpx u	cli imp	eor aby	nop imp u	sre aby u	nop abx u	eor abx	lsr abx	sre abx u
6	rts imp	adc izx	kil jam	rra izx u	nop zp u	adc zp	ror zp	rra zp u	pla imp	adc imm	ror acc	arr imm u	jmp ind	adc abs	ror abs	rra abs u
7	bvs rel	adc izy	kil jam	rra izy u	nop zpx u	adc zpx	ror zpx	rra zpx u	sei imp	adc aby	nop imp u	rra aby u	nop abx u	adc abx	ror abx	rra abx u
8	nop imm u	sta izx	nop imm u	sax izx u	sty zp	sta zp	stx zp	sax zp u	dey imp	nop imm u	txa imp	xaa imm ?	sty abs	sta abs	stx abs	sax abs u
9	bcc rel	sta izy	kil jam	sha izy ?	sty zpx	sta zpx	stx zpy	sax zpy u	tya imp	sta aby	txs imp	tas aby ?	shy abx ?	sta abx	shx aby ?	sha aby ?
A	ldy imm	lda izx	ldx imm	lax izx u	ldy zp	lda zp	ldx zp	lax zp u	tay imp	lda imm	tax imp	lxa imm ?	ldy abs	lda abs	ldx abs	lax abs u
B	bcs rel	lda izy	kil jam	lax izy u	ldy zpx	lda zpx	ldx zpy	lax zpy u	clv imp	lda aby	tsx imp	las aby ?	ldy abx	lda abx	ldx aby	lax aby u
C	cpy imm	cmp izx	nop imm u	dcp izx u	cpy zp	cmp zp	dec zp	dcp zp u	iny imp	cmp imm	dex imp	axs imm u	cpy abs	cmp abs	dec abs	dcp abs u
D	bne rel	cmp izy	kil jam	dcp izy u	nop zpx u	cmp zpx	dec zpx	dcp zpx u	cld imp	cmp aby	nop imp u	dcp aby u	nop abx u	cmp abx	dec abx	dcp abx u
E	cpx imm	sbc izx	nop imm u	isc izx u	cpx zp	sbc zp	inc zp	isc zp u	inx imp	sbc imm	nop imp	sbc imm u	cpx abs	sbc abs	inc abs	isc abs u
F	beq rel	sbc izy	kil jam	isc izy u	nop zpx u	sbc zpx	inc zpx	isc zpx u	sed imp	sbc aby	nop imp u	isc aby u	nop abx u	sbc abx	inc abx	isc abx u

65C02

All 256 opcodes are defined and documented on this chip. Opcodes new on the 65C02, or defined differently from the NMOS chip, are marked new and tinted; the others are as in the NMOS table above. The NOPs are of the sizes given on the 65C02 additions page.

	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
0	brk imp	ora izx	nop imm new	nop imp new	tsb zp new	ora zp	asl zp	rmb0 zp new	php imp	ora imm	asl acc	nop imp new	tsb abs new	ora abs	asl abs	bbr0 zpr new
1	bpl rel	ora izy	ora izp new	nop imp new	trb zp new	ora zpx	asl zpx	rmb1 zp new	clc imp	ora aby	inc acc new	nop imp new	trb abs new	ora abx	asl abx	bbr1 zpr new
2	jsr abs	and izx	nop imm new	nop imp new	bit zp	and zp	rol zp	rmb2 zp new	plp imp	and imm	rol acc	nop imp new	bit abs	and abs	rol abs	bbr2 zpr new
3	bmi rel	and izy	and izp new	nop imp new	bit zpx new	and zpx	rol zpx	rmb3 zp new	sec imp	and aby	dec acc new	nop imp new	bit abx new	and abx	rol abx	bbr3 zpr new
4	rti imp	eor izx	nop imm new	nop imp new	nop zp new	eor zp	lsr zp	rmb4 zp new	pha imp	eor imm	lsr acc	nop imp new	jmp abs	eor abs	lsr abs	bbr4 zpr new
5	bvc rel	eor izy	eor izp new	nop imp new	nop zpx new	eor zpx	lsr zpx	rmb5 zp new	cli imp	eor aby	phy imp new	nop imp new	nop abs new	eor abx	lsr abx	bbr5 zpr new
6	rts imp	adc izx	nop imm new	nop imp new	stz zp new	adc zp	ror zp	rmb6 zp new	pla imp	adc imm	ror acc	nop imp new	jmp ind	adc abs	ror abs	bbr6 zpr new
7	bvs rel	adc izy	adc izp new	nop imp new	stz zpx new	adc zpx	ror zpx	rmb7 zp new	sei imp	adc aby	ply imp new	nop imp new	jmp iax new	adc abx	ror abx	bbr7 zpr new
8	bra rel new	sta izx	nop imm new	nop imp new	sty zp	sta zp	stx zp	smb0 zp new	dey imp	bit imm new	txa imp	nop imp new	sty abs	sta abs	stx abs	bbs0 zpr new
9	bcc rel	sta izy	sta izp new	nop imp new	sty zpx	sta zpx	stx zpy	smb1 zp new	tya imp	sta aby	txs imp	nop imp new	stz abs new	sta abx	stz abx new	bbs1 zpr new
A	ldy imm	lda izx	ldx imm	nop imp new	ldy zp	lda zp	ldx zp	smb2 zp new	tay imp	lda imm	tax imp	nop imp new	ldy abs	lda abs	ldx abs	bbs2 zpr new
B	bcs rel	lda izy	lda izp new	nop imp new	ldy zpx	lda zpx	ldx zpy	smb3 zp new	clv imp	lda aby	tsx imp	nop imp new	ldy abx	lda abx	ldx aby	bbs3 zpr new
C	cpy imm	cmp izx	nop imm new	nop imp new	cpy zp	cmp zp	dec zp	smb4 zp new	iny imp	cmp imm	dex imp	wai imp new	cpy abs	cmp abs	dec abs	bbs4 zpr new
D	bne rel	cmp izy	cmp izp new	nop imp new	nop zpx new	cmp zpx	dec zpx	smb5 zp new	cld imp	cmp aby	phx imp new	stp imp new	nop abs new	cmp abx	dec abx	bbs5 zpr new
E	cpx imm	sbc izx	nop imm new	nop imp new	cpx zp	sbc zp	inc zp	smb6 zp new	inx imp	sbc imm	nop imp	nop imp new	cpx abs	sbc abs	inc abs	bbs6 zpr new
F	beq rel	sbc izy	sbc izp new	nop imp new	nop zpx new	sbc zpx	inc zpx	smb7 zp new	sed imp	sbc aby	plx imp new	nop imp new	nop abs new	sbc abx	inc abx	bbs7 zpr new

6502 Instruction Set – Opcode map

Introduction

NMOS 6502, 6510 and 2A03

65C02