Category : Assembly Language Source Code
Archive   : OPCODE_A.ZIP
Filename : OPCODES.TXT

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 1

| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| 00 am dl dh | B | 2/4 | ADD xb,rb |
| 01 am dl dh | W | 2/4 | ADD xw,rw |
| 02 am dl dh | B | 2/4 | ADD rb,xb |
| 03 am dl dh | W | 2/4 | ADD rw,xw |
| 04 ib | B | 2 | ADD AL,ib |
| 05 il ih | W | 3 | ADD AX,iw |
+-------------------+----+-----+---------------------------+
| 06 | | 1 | PUSH ES |
+-------------------+----+-----+---------------------------+
| 07 | | 1 | POP ES |
+-------------------+----+-----+---------------------------+
| 08 am dl dh | B | 2/4 | OR xb,rb |
| 09 am dl dh | W | 2/4 | OR xw,rw |
| 0A am dl dh | B | 2/4 | OR rb,xb |
| 0B am dl dh | W | 2/4 | OR rw,xw |
| 0C ib | B | 2 | OR AL,ib |
| 0D il ih | W | 3 | OR AX,iw |
+-------------------+----+-----+---------------------------+
| 0E | | 1 | PUSH CS |
+-------------------+----+-----+---------------------------+
| 0F | | 1 | ??? |
+-------------------+----+-----+---------------------------+
| 10 am dl dh | B | 2/4 | ADC xb,rb |
| 11 am dl dh | W | 2/4 | ADC xw,rw |
| 12 am dl dh | B | 2/4 | ADC rb,xb |
| 13 am dl dh | W | 2/4 | ADC rw,xw |
| 14 ib | B | 2 | ADC AL,ib |
| 15 il ih | W | 3 | ADC AX,iw |
+-------------------+----+-----+---------------------------+
| 16 | | 1 | PUSH SS |
+-------------------+----+-----+---------------------------+
| 17 | | 1 | POP SS |
+-------------------+----+-----+---------------------------+
| 18 am dl dh | B | 2/4 | SBB xb,rb |
| 19 am dl dh | W | 2/4 | SBB xw,rw |
| 1A am dl dh | B | 2/4 | SBB rb,xb |
| 1B am dl dh | W | 2/4 | SBB rw,xw |
| 1C ib | B | 2 | SBB AL,ib |
| 1D il ih | W | 3 | SBB AX,iw |
+-------------------+----+-----+---------------------------+
| 1E | | 1 | PUSH DS |
+-------------------+----+-----+---------------------------+
| 1F | | 1 | POP DS |
+-------------------+----+-----+---------------------------+

Notation
--------
OP Instruction OpCode.

XX Additional Code bytes.

S Sign Bit -- E - Sign-extend 8-bit immediate data

W Word/byte Bit -- W - 16-bit operands,
B - 8-bit operands

LEN Instruction length.

MNEMONICS Instruction syntax.

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 2

| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| 20 am dl dh | B | 2/4 | AND xb,rb |
| 21 am dl dh | W | 2/4 | AND xw,rw |
| 22 am dl dh | B | 2/4 | AND rb,xb |
| 23 am dl dh | W | 2/4 | AND rw,xw |
| 24 ib | B | 2 | AND AL,ib |
| 25 il ih | W | 3 | AND AX,iw |
+-------------------+----+-----+---------------------------+
| 26 | | 1 | ES: |
+-------------------+----+-----+---------------------------+
| 27 | | 1 | DAA |
+-------------------+----+-----+---------------------------+
| 28 am dl dh | B | 2/4 | SUB xb,rb |
| 29 am dl dh | W | 2/4 | SUB xw,rw |
| 2A am dl dh | B | 2/4 | SUB rb,xb |
| 2B am dl dh | W | 2/4 | SUB rw,xw |
| 2C ib | B | 2 | SUB AL,ib |
| 2D il ih | W | 3 | SUB AX,iw |
+-------------------+----+-----+---------------------------+
| 2E | | 1 | CS: |
+-------------------+----+-----+---------------------------+
| 2F | | 1 | DAS |
+-------------------+----+-----+---------------------------+
| 30 am dl dh | B | 2/4 | XOR xb,rb |
| 31 am dl dh | W | 2/4 | XOR xw,rw |
| 32 am dl dh | B | 2/4 | XOR rb,xb |
| 33 am dl dh | W | 2/4 | XOR rw,xw |
| 34 ib | B | 2 | XOR AL,ib |
| 35 il ih | W | 3 | XOR AX,iw |
+-------------------+----+-----+---------------------------+
| 36 | | 1 | SS: |
+-------------------+----+-----+---------------------------+
| 37 | | 1 | AAA |
+-------------------+----+-----+---------------------------+
| 38 am dl dh | B | 2/4 | CMP xb,rb |
| 39 am dl dh | W | 2/4 | CMP xw,rw |
| 3A am dl dh | B | 2/4 | CMP rb,xb |
| 3B am dl dh | W | 2/4 | CMP rw,xw |
| 3C ib | B | 2 | CMP AL,ib |
| 3D il ih | W | 3 | CMP AX,iw |
+-------------------+----+-----+---------------------------+
| 3E | | 1 | DS: |
+-------------------+----+-----+---------------------------+
| 3F | | 1 | AAS |
+-------------------+----+-----+---------------------------+

Additional Code Bytes
---------------------
am = Addressing mode Byte = mmregr/m
mm = Mode - 2-bit register/memory mode with disp.
00 = disp = 0, dl and dh are absent, unless r/m =
110, when effective address = dh dl.
01 = disp = sign-extended dl. dh is absent.
10 = disp = dh dl.
11 = two-register instruction -
reg = target and r/m = source.

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 3

| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| 40 | | 1 | INC AX |
| 41 | | 1 | INC CX |
| 42 | | 1 | INC DX |
| 43 | | 1 | INC BX |
| 44 | | 1 | INC SP |
| 45 | | 1 | INC BP |
| 46 | | 1 | INC SI |
| 47 | | 1 | INC DI |
+-------------------+----+-----+---------------------------+
| 48 | | 1 | DEC AX |
| 49 | | 1 | DEC CX |
| 49 | | 1 | DEC DX |
| 4A | | 1 | DEC BX |
| 4B | | 1 | DEC SP |
| 4C | | 1 | DEC BP |
| 4D | | 1 | DEC SI |
| 4F | | 1 | DEC DI |
+-------------------+----+-----+---------------------------+
| 50 | | 1 | PUSH AX |
| 51 | | 1 | PUSH CX |
| 52 | | 1 | PUSH DX |
| 53 | | 1 | PUSH BX |
| 54 | | 1 | PUSH SP |
| 55 | | 1 | PUSH BP |
| 56 | | 1 | PUSH SI |
| 57 | | 1 | PUSH DI |
+-------------------+----+-----+---------------------------+
| 58 | | 1 | POP AX |
| 59 | | 1 | POP CX |
| 5A | | 1 | POP DX |
| 5B | | 1 | POP BX |
| 5C | | 1 | POP SP |
| 5D | | 1 | POP BP |
| 5E | | 1 | POP SI |
| 5F | | 1 | POP DI |
+-------------------+----+-----+---------------------------+

reg = Register | r/m = Register/Memory
reg W=1 W=0 | r/m operand address
--- --- --- | --- ---------------
000 AX AL | 000 DS:[BX+SI+disp]
001 CX CL | 001 DS:[BX+DI+disp]
010 DX DL | 010 DS:[BP+SI+disp]
011 BX BL | 011 DS:[BP+dI+disp]
100 SP AH | 100 DS:[SI+disp]
101 BP CH | 101 DS:[DI+disp]
110 SI DH | 110 DS:[BP+disp]
111 DI BH | 111 DS:[BX+disp]

dl dh = Displacement [disp_low disp_high]
ds = Short Displacement to label 'sl' (-128/+127 bytes)

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 4

| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| 60 | | 1 | PUSHA [186] |
| 61 | | 1 | POPA [186] |
+-------------------+----+-----+---------------------------+
| 62 am dl dh | | 4 | BOUND rw fp [186] |
+-------------------+----+-----+---------------------------+
| 63 | | 1 | ??? |
| 64 | | 1 | ??? |
| 65 | | 1 | ??? |
| 66 | | 1 | ??? |
| 67 | | 1 | ??? |
+-------------------+----+-----+---------------------------+
| 68 il ih | N | 3 | PUSH iw [186] |
+-------------------+----+-----+---------------------------+
| 69 am dl dh il ih | N | 3/5 | IMUL rw,[xw,]iw [186] |
+-------------------+----+-----+---------------------------+
| 6A ib | E | 2 | PUSH ib [186] |
+-------------------+----+-----+---------------------------+
| 6B am dl dh il | E | 2/4 | IMUL rw,[xw,]ib [186] |
+-------------------+----+-----+---------------------------+
| 6C | B | 1 | INSB [186] |
| 6D | W | 1 | INSW [186] |
+-------------------+----+-----+---------------------------+
| 6E | B | 1 | OUTSB [186] |
| 6F | W | 1 | OUTSW [186] |
+-------------------+----+-----+---------------------------+
| 70 ds | | 2 | JO sl |
| 71 ds | | 2 | JNO sl |
| 72 ds | | 2 | JB sl |
| 73 ds | | 2 | JNB sl |
| 74 ds | | 2 | JZ sl |
| 75 ds | | 2 | JNZ sl |
| 76 ds | | 2 | JNA sl |
| 77 ds | | 2 | JA sl |
| 78 ds | | 2 | JS sl |
| 79 ds | | 2 | JNS sl |
| 7A ds | | 2 | JP sl |
| 7B ds | | 2 | JNP sl |
| 7C ds | | 2 | JL sl |
| 7D ds | | 2 | JNL sl |
| 7E ds | | 2 | JNG sl |
| 7F ds | | 2 | JG sl |
+-------------------+----+-----+---------------------------+

ib = Immediate byte value il ih = Immediate word value
ol oh = Offset value sl sh = Segment value

Mnemonic Notation
-----------------
ib = Immediate byte value iw = Immediate word value

xb = Memory/register byte xw = Memory/register word

mw = Memory word np = near pointer

rb = Byte register. rw = Word register

sl = Short label.

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 5

| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| 80 am dl dh il ih | NB | 4/6 | Imm xb,ib |
| 81 am dl dh il ih | NW | 4/6 | Imm xw,iw |
| 82 am dl dh ib | EB | 3/5 | Imm xb,ib |

| 83 am dl dh ib | EW | 3/5 | Imm xw,ib |
+-------------------+----+-----+---------------------------+
| 84 am dl dh | B | 2/4 | TEST xb,xb |
| 85 am dl dh | W | 2/4 | TEST xw,xw |
+-------------------+----+-----+---------------------------+
| 86 am dl dh | B | 2/4 | XCHG xb,xb |
| 87 am dl dh | W | 2/4 | XCHG xw,xw |
+-------------------+----+-----+---------------------------+
| 88 am dl dh | B | 2/4 | MOV xb,rb |
| 89 am dl dh | W | 2/4 | MOV xw,rw |
| 8A am dl dh | B | 2/4 | MOV rb,xb |
| 8B am dl dh | W | 2/4 | MOV rw,xw |
| 8C am dl dh | | 2/4 | MOV xw,sr |
+-------------------+----+-----+---------------------------+
| 8D am dl dh | | 4 | LEA rw,np |
+-------------------+----+-----+---------------------------+
| 8E am dl dh | | 2/4 | MOV sr,xw |
+-------------------+----+-----+---------------------------+
| 8F am dl dh | | 4 | POP xw |
+-------------------+----+-----+---------------------------+
| 90 | | 1 | NOP |
+-------------------+----+-----+---------------------------+
| 91 | | 1 | XCHG CX,AX |
| 92 | | 1 | XCHG DX,AX |
| 93 | | 1 | XCHG BX,AX |
| 94 | | 1 | XCHG SP,AX |
| 95 | | 1 | XCHG BP,AX |
| 96 | | 1 | XCHG SI,AX |
| 97 | | 1 | XCHG DI,AX |
+-------------------+----+-----+---------------------------+
| 98 | | 1 | CBW |
| 99 | | 1 | CWD |
+-------------------+----+-----+---------------------------+
| 9A ol oh sl sh | | 5 | CALL FAR PTR dw |
+-------------------+----+-----+---------------------------+
| 9B | | 1 | WAIT |
+-------------------+----+-----+---------------------------+
| 9C | | 1 | PUSHF |
| 9D | | 1 | POPF |
+-------------------+----+-----+---------------------------+
| 9E | | 1 | SAHF |
| 9F | | 1 | LAHF |
+-------------------+----+-----+---------------------------+

reg | Imm sr = Segment Register
-----+----- ----------------
000 | ADD 00 ES
001 | OR 01 CS
010 | ADC 10 SS
011 | SBB 11 DS
100 | AND
101 | SUB
110 | XOR
111 | CMP
-----+-----

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 6


| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| A0 dl dh | B | 3 | MOV AL,xb |
| A1 dl dh | W | 3 | MOV AX,xw |
| A2 dl dh | B | 3 | MOV xb,AL |
| A3 dl dh | W | 3 | MOV xw,AX |
+-------------------+----+-----+---------------------------+
| A4 | B | 1 | MOVSB |
| A5 | W | 1 | MOVSW |
+-------------------+----+-----+---------------------------+
| A6 | B | 1 | CMPSB |
| A7 | W | 1 | CMPSW |
+-------------------+----+-----+---------------------------+
| A8 ib | B | 2 | TEST AL,ib |
| A9 il ih | W | 3 | TEST AX,iw |
+-------------------+----+-----+---------------------------+
| AA | B | 1 | STOSB |
| AB | W | 1 | STOSW |
+-------------------+----+-----+---------------------------+
| AC | B | 1 | LODSB |
| AD | W | 1 | LODSW |
+-------------------+----+-----+---------------------------+
| AE | B | 1 | SCASB |
| AF | W | 1 | SCASW |
+-------------------+----+-----+---------------------------+
| B0 ib | B | 2 | MOV AL,ib |
| B1 ib | B | 2 | MOV CL,ib |
| B2 ib | B | 2 | MOV DL,ib |
| B3 ib | B | 2 | MOV BL,ib |
| B4 ib | B | 2 | MOV AH,ib |
| B5 ib | B | 2 | MOV CH,ib |
| B6 ib | B | 2 | MOV DH,ib |
| B7 ib | B | 2 | MOV BH,ib |
+-------------------+----+-----+---------------------------+
| B8 il ih | W | 3 | MOV AX,iw |
| B9 il ih | W | 3 | MOV CX,iw |
| BA il ih | W | 3 | MOV DX,iw |
| BB il ih | W | 3 | MOV BX,iw |
| BC il ih | W | 3 | MOV SP,iw |
| BD il ih | W | 3 | MOV BP,iw |
| BE il ih | W | 3 | MOV SI,iw |
| BF il ih | W | 3 | MOV DI,iw |
+-------------------+----+-----+---------------------------+

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 7


| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| C0 am dl dh ib | B | 3/5 | Shift xb,ib [186] |
| C1 am dl dh ib | W | 3/5 | Shift xw,ib [186] |
+-------------------+----+-----+---------------------------+
| C2 il ih | | 3 | RETN iw |
| C3 | | 1 | RETN |
+-------------------+----+-----+---------------------------+
| C4 am dl dh | | 4 | LES rx,fp |
| C5 am dl dh | | 4 | LDS rx,fp |
+-------------------+----+-----+---------------------------+
| C6 am ib | B | 3 | MOV xb,ib |
| C7 am il ih | W | 4 | MOV xw,iw |
+-------------------+----+-----+---------------------------+
| C8 ih il ib | | 4 | ENTER iw,ib [186] |
+-------------------+----+-----+---------------------------+
| C9 | | 1 | LEAVE [186] |
+-------------------+----+-----+---------------------------+
| CA dl dh | | 3 | RETF iw |
| CB | | 1 | RETF |
+-------------------+----+-----+---------------------------+
| CC | | 1 | INT 3 |
| CD ib | | 2 | INT ib |
+-------------------+----+-----+---------------------------+
| CE | | 1 | INTO |
+-------------------+----+-----+---------------------------+
| CF | | 1 | IRET |
+-------------------+----+-----+---------------------------+
| D0 am dl dh | B | 2/4 | Shift xb,1 |
| D1 am dl dh | W | 2/4 | Shift xw,1 |
| D2 am dl dh | B | 2/4 | Shift xb,CL |
| D3 am dl dh | W | 2/4 | Shift xw,CL |
+-------------------+----+-----+---------------------------+
| D4 0A | | 2 | AAM |
| D5 0A | | 2 | AAD |
+-------------------+----+-----+---------------------------+
| D6 | | | ??? |
+-------------------+----+-----+---------------------------+
| D7 | | 1 | XLAT |
+-------------------+----+-----+---------------------------+
| D8 am | | 2 | ESC 00-07 |
| D9 am | | 2 | ESC 08-0F |
| DA am | | 2 | ESC 10-17 |
| DB am | | 2 | ESC 18-1F |
| DC am | | 2 | ESC 20-27 |
| DD am | | 2 | ESC 28-2F |
| DE am | | 2 | ESC 30-37 |
| DF am | | 2 | ESC 38-3F |
+-------------------+----+-----+---------------------------+

reg | Shf
-----+-----
000 | ROL
001 | ROR
010 | RCL
011 | RCR
100 | SHL
101 | SHR
110 | ???
111 | SAR
-----+-----

8086/88/186/188/286 Instruction Set OpCodes PGS - Page 8


| OP XX XX XX XX XX | SW | len | MNEMONICS |
+-------------------+----+-----+---------------------------+
| E0 ds | | 2 | LOOPNZ sl |
| E1 ds | | 2 | LOOPZ sl |
| E2 ds | | 2 | LOOP sl |
| E3 ds | | 2 | JCXZ sl |
+-------------------+----+-----+---------------------------+
| E4 ib | B | 2 | IN AL,ib |
| E5 ib | W | 2 | IN AX,ib |
+-------------------+----+-----+---------------------------+
| E6 ib | B | 2 | OUT ib,AL |
| E7 ib | W | 2 | OUT ib,AX |
+-------------------+----+-----+---------------------------+
| E8 dl dh | | 3 | CALL np |
+-------------------+----+-----+---------------------------+
| E9 dl dh | | 3 | JMP np |
| EA ol oh sl sh | | 5 | JMP FAR PTR mw |
| EB ds | | 2 | JMP SHORT sl |
+-------------------+----+-----+---------------------------+
| EC | B | 1 | IN AL,DX |
| ED | W | 1 | IN AX,DX |
+-------------------+----+-----+---------------------------+
| EE | B | 1 | OUT DX,AL |
| EF | W | 1 | OUT DX,AX |
+-------------------+----+-----+---------------------------+
| F0 | | 1 | LOCK |
+-------------------+----+-----+---------------------------+
| F1 | | 1 | ??? |
+-------------------+----+-----+---------------------------+
| F2 | | 1 | REP/REPNZ |
| F3 | | 1 | REPZ |
+-------------------+----+-----+---------------------------+
| F4 | | 1 | HLT |
+-------------------+----+-----+---------------------------+
| F5 | | 1 | CMC |
+-------------------+----+-----+---------------------------+
| F6 am dl dh ib | B | 2-5 | Grp1 |
| F7 am dl dh il ih | W | 2-6 | Grp1 |
+-------------------+----+-----+---------------------------+
| F8 | | 1 | CLC |
| F9 | | 1 | STC |
| FA | | 1 | CLI |
| FB | | 1 | STI |
| FC | | 1 | CLD |
| FD | | 1 | STD |
+-------------------+----+-----+---------------------------+
| FE am dl dh | B | 2/4 | Grp2 |
| FF am dl dh | W | 2/4 | Grp2 |
+-------------------+----+-----+---------------------------+

reg | Grp1 reg | Grp2
-----+--------------------- -----+-----------------------
000 | TEST xb/xw,ib/iw 000 | INC xb/xw
001 | ??? 001 | DEC xb/xw
010 | NOT xb/xw 010 | CALL rw
011 | NEG xb/xw 011 | CALL DWORD PTR[rw]
100 | MUL xb/xw 100 | JMP rw
101 | IMUL xb/xw 101 | JMP DWORD PTR[rw]
110 | DIV xb/xw 110 | PUSH mw
111 | IDIV xb/xw 111 | ???
-----+--------------------- -----+-----------------------