
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 | ???
-----+---------------------   -----+-----------------------


