6502 opcodes

The following table contains a list of opcodes for the 6502 processor, as used in the NES. (this list is incomplete; for a full list of opcodes used by the 6502, including undocumented and illegal instructions, see http://www.oxyron.de/html/opcodes02.html)

• ABS = Absolute
• ACC = Accumulator
• IMM = Immediate
• IND = Indirect

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Mnemonic	Description	Implied / ACC	(IND),X	(IND,Y)	ABS	ABS,X	IMM	ABS,Y	Zero Page	Zero Page,X
ADC	add memory to accumulator with carry		61	71	6D	7D	69	79	65	75
AND	AND memory with accumulator		21	31	2D	3D	29	39	25	35
ASL	shift left one bit (memory or accumulator)	0A							06	16
BCC	branch on carry clear	90
BCS	branch on carry set	B0
BEQ	branch on result zero	F0
BIT	test bits in memory with accumulator				2C				24
BMI	branch on result minus	30
BNE	branch on result not zero	D0
BPL	branch on result plus	10
BVC	branch on overflow clear	50
BVS	branch on overflow set	70
CLC	clear carry flag	18
CLD	clear decimal mode	D8
CLI	clear interrupt disable bit	58
CLV	clear overflow flag	B8
CMP	compare memory and accumulator		C1	D1	CD	DD	C9	D9	C5	D5
CPX	compare memory and X register				EC		E0		E4
CPY	compare memory and Y register				CC		C0		C4
Mnemonic	Description	Implied / ACC	(IND),X	(IND,Y)	ABS	ABS,X	IMM	ABS,Y	Zero Page	Zero Page,X
DEC	decrement memory				CE	DE			C6	D6
DEX	decrement X register	CA
DEY	decrement Y register	88
EOR	EXCLUSIVE OR memory with accumulator		41	51	4D	5D	49	59	45	55
INC	increment memory				EE	FE			E6	F6
INX	increment X register	E8
INY	increment Y register	C8
JMP	jump to new location	6C			4C
JSR	jump to new location saving return address	20
LDA	load accumulator with memory		A1	B1	AD	BD	A9	B9	A5	B5
LDX	load X register with memory				AE		A2	BE	A6	B6
LDY	load Y register with memory				AC	BC	A0		A4	B4
LSR	shift right one bit (memory or accumulator)	4A			4E	5E			46
NOP	no operation	EA
ORA	OR memory with accumulator		01	11	0D	1D	09	19	05	15
PHA	push accumulator on stack	48
PHP	push processor status on stack	08
PLA	pull accumulator from from stack	68
PLP	pull processor status from stack	28
Mnemonic	Description	Implied / ACC	(IND),X	(IND,Y)	ABS	ABS,X	IMM	ABS,Y	Zero Page	Zero Page,X
ROL	rotate one bit left (memory or accumulator)	2A			2E				26	36
ROR	rotate one bit right (memory or accumulator)	6A			6E	7E			66	76
RTI	return from interrupt	40
RTS	return from subroutine	60
SBC	subtract memory from accumulator with borrow		E1	F1	ED	FD	E9	F9	E5	F5
SEC	set carry flag	38
SED	set decimal mode	F8
SEI	set interrupt disable bit	78
STA	store accumulator in memory		81	91	8D	9D		99	85	95
STX	store X register in memory				8E				86	96
STY	store Y register in memory				8C				84	94
TAX	transfer accumulator to X register	AA
TAY	transfer accumulator to Y register	A8
TSX	transfer stack pointer to X register	BA
TXA	transfer X register to accumulator	8A
TXS	transfer X register to stack pointer	9A
TYA	transfer Y register to accumulator	98