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Complete 8086 instruction set documentation.
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Go to file| a | b | c | d | e | f | g | h |
|---|---|---|---|---|---|---|---|
| AAA | DAA | HLT | JNL | LODSB | POP | ROR | XCHG |
| AAD | DAS | IMUL | JNLE | LODSW | POPA | SAHF | XLATB |
| AAM | DEC | INC | JNO | LOOP | POPF | SAL | XOR |
| AAS | DIV | INTO | JNP | LOOPE | PUSH | SAR | |
| ADC | IDIV | JA | JNS | LOOPNE | PUSHA | SBB | |
| ADD | IN | JB | JNZ | LOOPNZ | PUSHF | SCASB | |
| AND | INT | JBE | JO | LOOPZ | RCL | SCASW | |
| CALL | IRET | JE | JP | MOV | RCR | SHL | |
| CBW | JAE | JGE | JPE | MOVSB | REP | SHR | |
| CLD | JC | JLE | JPO | MOVSW | REPE | STC | |
| CLI | JCXZ | JNA | JS | MUL | REPNE | STD | |
| CMC | JG | JNB | JZ | NEG | REPNZ | STI | |
| CMP | JL | JNC | LAHF | NOP | REPZ | STOSB | |
| CMPSB | JMP | JNE | LDS | NOT | RET | STOSW | |
| CMPSW | JNAE | JNG | LEA | OR | RETF | SUB | |
| CWD | JNBE | JNGE | LES | OUT | ROL | TEST |
REG: AX, BX, CX, DX, AH, AL, BL, BH, CH, CL, DH, DL, DI, SI, BP, SP. SREG: DS, ES, SS, and only as second operand: CS. memory: [BX], [BX+SI+7], variable, etc. immediate: 5, -24, 3Fh, 10001101b, etc.
AL, DL DX, AX m1 DB ? AL, m1 m2 DW ? AX, m2 memory, immediate REG, immediate memory, REG REG, SREG include 'emu8086.inc' ORG 100h MOV AL, 1 MOV BL, 2 PRINTN 'Hello World!' ; macro. MOV CL, 3 PRINTN 'Welcome!' ; macro. RET
These marks are used to show the state of the flags:
Some instructions generate exactly the same machine code, so disassembler may have a problem decoding to your original code. This is especially important for Conditional Jump instructions.
Instruction Operands Description
ASCII Adjust after Addition.
Corrects result in AH and AL after addition when working with BCD values. It works according to the following
if low nibble of AL > 9 or AF = 1 then:
MOV AX, 15 ; AH = 00, AL = 0Fh AAA ; AH = 01, AL = 05 RET
C Z S O P A r ? ? ? ? r ASCII Adjust before Division. Prepares two BCD values for division.
MOV AX, 0105h ; AH = 01, AL = 05 AAD ; AH = 00, AL = 0Fh (15) RET
C Z S O P A ? r r ? r ? ASCII Adjust after Multiplication.
Corrects the result of multiplication of two BCD values.
MOV AL, 15 ; AL = 0Fh AAM ; AH = 01, AL = 05 RET
C Z S O P A ? r r ? r ? ASCII Adjust after Subtraction.
Corrects result in AH and AL after subtraction when working with BCD values.
if low nibble of AL > 9 or AF = 1 then:
MOV AX, 02FFh ; AH = 02, AL = 0FFh AAS ; AH = 01, AL = 09 RET
C Z S O P A r ? ? ? ? r operand1 = operand1 + operand2 + CF
STC ; set CF = 1 MOV AL, 5 ; AL = 5 ADC AL, 1 ; AL = 7 RET
C Z S O P A r r r r r r operand1 = operand1 + operand2
MOV AL, 5 ; AL = 5 ADD AL, -3 ; AL = 2 RET
C Z S O P A r r r r r r Logical AND between all bits of two operands. Result is stored in operand1.
These rules apply:
MOV AL, 'a' ; AL = 01100001b AND AL, 11011111b ; AL = 01000001b ('A') RET
C Z S O P 0 r r 0 r Transfers control to procedure, return address is (IP) is pushed to stack.
4-byte address may be entered in this form: 1234h:5678h, first value is a segment second value is an offset (this is a far call, so CS is also pushed to stack).
ORG 100h ; for COM file. CALL p1 ADD AX, 1 RET ; return to OS. p1 PROC ; procedure declaration. MOV AX, 1234h RET ; return to caller. p1 ENDP
C Z S O P A unchanged Convert byte into word.
if high bit of AL = 1 then:
MOV AX, 0 ; AH = 0, AL = 0 MOV AL, -5 ; AX = 000FBh (251) CBW ; AX = 0FFFBh (-5) RET
C Z S O P A unchanged