Intel 4004 Op-Codes

Intel 4004 processor Op-Codes

Instruction	Mnemonic	1st byte	2nd byte	Modifiers
No Operation	NOP	00000000
Jump Conditional	JCN	0001CCCC	AAAAAAAA	C, A
Fetch Immediate	FIM	0010RRR0	DDDDDDDD	RP, D
Send Register Control	SRC	0010RRR1		RP
Fetch Indirect	FIN	0011RRR0		RP
Jump Indirect	JIN	0011RRR1		RP
Jump Unconditional	JUN	0100AAAA	AAAAAAAA	A
Jump to Subroutine	SRC	0101AAAA	AAAAAAAA	A
Increment	INC	0110RRRR		R
Increment and Skip	ISZ	0111RRRR	AAAAAAAA	R, A
Add	ADD	1000RRRR		R
Subtract	SUB	1001RRRR		R
Load	LD	1010RRRR		R
Exchange	XCH	1011RRRR		R
Branch Back and Load	BBL	1100DDDD		D
Load Immediate	LDM	1101DDDD		D
Write Main Memory	WRM	11100000
Write RAM Port	WMP	11100001
Write Program RAM	WPM	11100011
Write ROM Port	WRR	11100010
Write Status Char 0	WR0	11100100
Write Status Char 1	WR1	11100101
Write Status Char 2	WR2	11100110
Write Status Char 3	WR3	11100111
Subtract Main Memory	SBM	11101000
Read Main Memory	RDM	11101001
Read ROM Port	RDR	11101010
Add Main Memory	ADM	11101011
Read Status Char 0	RD0	11101100
Read Status Char 1	RD1	11101101
Read Status Char 2	RD2	11101110
Read Status Char 3	RD3	11101111
Clear Both	CLB	11110000
Clear Carry	CLC	11110001
Increment Accumulator	IAC	11110010
Complement Carry	CMC	11110011
Complement Accumulator	CMA	11110100
Rotate Left	RAL	11110101
Rotate Right	RAR	11110110
Transfer Carry and Clear	TCC	11110111
Decrement Accumulator	DAC	11111000
Transfer Carry Subtract	TCS	11111001
Set Carry	STC	11111010
Decimal Adjust Accumulator	DAA	11111011
Keyboard Process	KBP	11111100
Designate Command Line	DCL	11111101

Note

Modifiers

• A = Address

• C = Condition

• D = Data

• R = Register

• RP = Register Pair