Arithmetic instructions in 8086 microprocessor

Arithmetic Instructions are the instructions which perform basic arithmetic operations such as addition, subtraction and a few more. Unlike in 8085 microprocessor, in 8086 microprocessor the destination operand need not be the accumulator.

Following is the table showing the list of arithmetic instructions:

OPCODE	OPERAND	EXPLANATION	EXAMPLE
ADD	D, S	D = D + S	ADD AX, [2050]
ADC	D, S	D = D + S + prev. carry	ADC AX, BX
SUB	D, S	D = D – S	SUB AX, [SI]
SBB	D, S	D = D – S – prev. carry	SBB [2050], 0050
MUL	8-bit register	AX = AL * 8-bit reg.	MUL BH
MUL	16-bit register	DX AX = AX * 16-bit reg.	MUL CX
IMUL	8 or 16 bit register	performs signed multiplication	IMUL CX
DIV	8-bit register	AX = AX / 8-bit reg. ; AL = quotient ; AH = remainder	DIV BL
DIV	16-bit register	DX AX / 16-bit reg. ; AX = quotient ; DX = remainder	DIV CX
IDIV	8 or 16 bit register	performs signed division	IDIV BL
INC	D	D = D + 1	INC AX
DEC	D	D = D – 1	DEC [2050]
CBW	none	converts signed byte to word	CBW
CWD	none	converts signed byte to double word	CWD
NEG	D	D = 2’s compliment of D	NEG AL
DAA	none	decimal adjust accumulator	DAA
DAS	none	decimal adjust accumulator after subtraction	DAS
AAA	none	ASCII adjust accumulator after addition	AAA
AAS	none	ASCII adjust accumulator after subtraction	AAS
AAM	none	ASCII adjust accumulator after multiplication	AAM
AAD	none	ASCII adjust accumulator after division	AAD

Here D stands for destination and S stands for source.
D and S can either be register, data or memory address.

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