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COMPLETE LIST OF 6502 INSTRUCTIONS

Mnemonic / Instruction Mode Opcode Function Updated flags
ADC: ADd to
Accumulator with Carry		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 69
65
75
6D
7D
79
61
71		 A,C <= A + M + C N Z C V
AND: Logical And of
Memory and Accumulator		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 29
25
35
2D
3D
39
21
31		 A <= A and M N Z
ASL: Arithmetic Shift Left Accumulator
Zero Page
Zero Page,X
Absolute
Absolute,X		 0A
06
16
0E
1E		 A <= A * 2 (Accumulator)
M <= M * 2 (Other modes)		 N Z C
BCC: Branch on Carry Clear Relative 90 Branches if C=0 none
BCS: Branch on Carry Set Relative B0 Branches if C=1 none
BEQ: Branch if Equal Relative F0 Branches if Z=1 none
BIT: Test Bits with Accumulator Zero Page
Absolute		 24
2C		 N=M7, V=M6
Z=1 if A and M=0		 N Z V
BMI: Branch if Minus Relative 30 Branches if N=1 none
BNE: Branch if Not Equal Relative D0 Branches if Z=0 none
BPL: Branch if Plus Relative 10 Branches if N=0 none
BRK: Break Implied 00 Forced Interrupt I
BVC: Branch on Overflow Clear Relative 50 Branches if V=0 none
BVS: Branch on Overflow Set Relative 70 Branches if V=1 none
CLC: Clear Carry Flag Implied 18 C <= 0 C
CLD: Clear Decimal Mode Implied D8 D <= 0 D
CLI: Clear Interrupt Disable Implied 58 I <= 0 I
CLV: Clear Overflow Flag Implied B8 V <= 0 V
CMP: Compare
Memory and Accumulator		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 C9
C5
D5
CD
DD
D9
C1
D1		 If A < M: N=1, Z=0, C=0
If A = M: N=0, Z=1, C=1
If A > M: N=0, Z=0, C=1		 N Z C
CPX: Compare
Memory and X reg.		 Immediate
Zero Page
Absolute		 E0
E4
EC		 If X < M: N=1, Z=0, C=0
If X = M: N=0, Z=1, C=1
If X > M: N=0, Z=0, C=1		 N Z C
CPY: Compare
Memory and Y reg.		 Immediate
Zero Page
Absolute		 C0
C4
CC		 If Y < M: N=1, Z=0, C=0
If Y = M: N=0, Z=1, C=1
If Y > M: N=0, Z=0, C=1		 N Z C
DEC: Decrement
Memory by One		 Zero Page
Zero Page,X
Absolute
Absolute,X		 C6
D6
CE
DE		 M <= M -1 N Z
DEX: Decrement X Implied CA X <= X - 1 N Z
DEY: Decrement Y Implied 88 Y <= Y - 1 N Z
EOR: Logical
Exclusive Or of
Memory and
Accumulator		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 49
45
55
4D
5D
59
41
51		 A <= A xor M N Z
INC: Increment
Memory by One		 Zero Page
Zero Page,X
Absolute
Absolute,X		 E6
F6
EE
FE		 M <= M + 1 N Z
INX: Increment X Implied E8 X <= X + 1 N Z
INY: Increment Y Implied C8 Y <= Y + 1 NZ
JMP: Jump Absolute
Indirect		 4C
6C		 Jumps to indicated position none
JSR: Jump to Subroutine Absolute 20 jumps to subroutine! none
LDA: Load Accumulator Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 A9
A5
B5
AD
BD
B9
A1
B1		 A <= M N Z
LDX: Load X Immediate
Zero Page
Zero Page,Y
Absolute
Absolute,Y		 A2
A6
B6
AE
BE		 X <= M N Z
LDY: Load Y Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X		 A0
A4
B4
AC
BC		 Y <= M N Z
LSR: Logical Shift Right Accumulator
Zero Page
Zero Page,X
Absolute
Absolute,X		 4A
46
56
4E
5E		 A <= A / 2 (Accumulator)
M <= M / 2 (outros modos)		 N Z C
NOP: No Operation Implied EA What it does? It doesn't! none
ORA: Logical Or
of Memory and Accumulator		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 09
05
15
0D
1D
19
01
11		 A <= A or M N Z
PHA: Push Accumulator
on Stack		 Implied 48 Stack <= A none
PHP: Push Processor
Status on Stack		 Implied 08 Stack <= P none
PLA: Pull Accumulator
from Stack		 Implied 68 A <= Stack N Z
PLP: Pull Processor
Status from Stack		 Implied 28 P <= Stack todos
ROL: Rotate Left Accumulator
Zero Page
Zero Page,X
Absolute
Absolute,X		 2A
26
36
2E
3E		 C <= M[7]
M[7] <= M[6]
...
M[1] <= M[0]
M[0] <= C
(Rotate A in Accumulator mode)		 N Z C
ROR: Rotate Right Accumulator
Zero Page
Zero Page,X
Absolute
Absolute,X		 6A
66
76
6E
7E		 C => M[7]
M[7] => M[6]
...
M[1] => M[0]
M[0] => C
(Rotate A in Accumulator mode)		 N Z C
RTI: Return from Interrupt Implied 40 Returns from interrupt! todos
RTS: Return from Subroutine Implied 60 Returns from subroutine! none
SBC: Subtract from
Accumulator with Carry		 Immediate
Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 E9
E5
F5
ED
FD
F9
E1
F1		 A <= A - M - (not C) N Z C V
SEC: Ift Carry Flag Implied 38 C <= 1 C
SED: Ift Decimal Mode Implied F8 D <= 1 D
SEI: Ift Interrupt Disable Implied 78 I <= 1 I
STA: Store Accumulator
In Memory		 Zero Page
Zero Page,X
Absolute
Absolute,X
Absolute,Y
(Indirect,X)
(Indirect),Y		 85
95
8D
9D
99
81
91		 M <= A none
STX: Store X in Memory Zero Page
Zero Page,Y
Absolute		 86
96
8E		 M <= X none
STY: Store Y in Memory Zero Page
Zero Page,X
Absolute		 84
94
8C		 M <= Y none
TAX: Transfer A to X Implied AA X <= A N Z
TAY: Transfer A to Y Implied A8 Y <= A N Z
TYA: Transfer Y to A Implied 98 A <= Y N Z
TSX: Transfer S to X Implied BA X <= S N Z
TXA: Transfer X to A Implied 8A A <= X N Z
TXS: Transfer X to S Implied 9A S <= X N Z