PCjs Machines
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The MS-DOS Encyclopedia
Appendix I: 8086/8088/80286/80386 Instruction Sets
The 8086/8088 Instruction Set
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Mnemonic Description
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AAA ASCII adjust after addition
AAD ASCII adjust before division
AAM ASCII adjust after multiplication
AAS ASCII adjust after subtraction
ADC Add with carry
ADD Add
AND Logical AND
CALL Call procedure
CBW Convert byte to word
CLC Clear carry flag
CLD Clear direction flag
CLI Clear interrupt flag
CMC Complement carry flag
CMP Compare
CMPS Compare string
CMPSB Compare byte string
CMPSW Compare word string
CWD Convert word to doubleword
DAA Decimal adjust for addition
DAS Decimal adjust for subtraction
DEC Decrement by 1
DIV Unsigned divide
ESC Escape
HLT Halt
IDIV Integer divide
IMUL Integer multiply
IN Input from port
INC Increment by 1
INT Call to interrupt procedure
INTO Interrupt on overflow
IRET Interrupt on return
JA Jump on above
JAE Jump on above or equal
JB Jump on below
JBE Jump on below or equal
JC Jump on carry
JCXZ Jump on CX zero
JE Jump on equal
JG Jump on greater
JGE Jump on greater or equal
JL Jump on less than
JLE Jump on less than or equal
JMP Jump unconditionally
JNA Jump on not above
JNAE Jump on not above or equal
JNB Jump on not below
JNBE Jump on not below or equal
JNC Jump on no carry
JNE Jump on not equal
JNG Jump on not greater
JNGE Jump on not greater or equal
JNL Jump on not less than
JNLE Jump on not less than or equal
JNO Jump on not overflow
JNP Jump on not parity
JNS Jump on not sign
JNZ Jump on not zero
JO Jump on overflow
JP Jump on parity
JPE Jump on parity even
JPO Jump on parity odd
JS Jump on sign
JZ Jump on zero
LAHF Load AH with flags
LDS Load pointer into DS
LEA Load effective address
LES Load pointer into ES
LOCK Lock the bus
LODS Load string
LODSB Load byte (string)
LODSW Load word (string)
LOOP Loop
LOOPE Loop while equal
LOOPNE Loop while not equal
LOOPNZ Loop while not zero
LOOPZ Loop while zero
MOV Move data
MOVS Move data from string to string
MOVSB Move byte (string)
MOVSW Move word (string)
MUL Multiply
NEG Negate
NOP No operation
NOT Logical NOT
OR Logical OR
OUT Output to port
POP Pop top of stack
POPF Pop stack into flags
PUSH Push onto stack
PUSHF Push flags onto stack
RCL Rotate through carry left
RCR Rotate through carry right
REP Repeat
REPE Repeat while equal
REPNE Repeat while not equal
REPNZ Repeat while not zero
REPZ Repeat while zero
RET Return
ROL Rotate left
ROR Rotate right
SAHF Store AH into flags
SAL Shift arithmetic left
SAR Shift arithmetic right
SBB Subtract with borrow
SCAS Scan string
SCASB Scan byte (string)
SCASW Scan word (string)
SHL Shift logical left
SHR Shift logical right
STC Set carry flag
STD Set direction flag
STI Set interrupt flag
STOS Store string
STOSB Store byte (string)
STOSW Store word (string)
SUB Subtract
TEST Logical compare
WAIT Enter wait state
XCHG Exchange
XLAT Translate
XOR Exclusive OR
The 80286 Instruction Set
╓┌─────────────────────┌─────────────────────────────────────────────────────╖
Mnemonic Description
──────────────────────────────────────────────────────────────────
AAA ASCII adjust after addition
AAD ASCII adjust before division
AAM ASCII adjust after multiplication
AAS ASCII adjust after subtraction
ADC Add with carry
ADD Add
AND Logical AND
ARPL Adjust RPL field of selector
BOUND Check array index against bounds
CALL Call procedure
CBW Convert byte to word
CLC Clear carry flag
CLD Clear direction flag
CLI Clear interrupt flag
CLTS Clear task switched flag
CMC Complement carry flag
CMP Compare
CMPS Compare string
CMPSB Compare byte string
CMPSW Compare word string
CWD Convert word to doubleword
DAA Decimal adjust for addition
DAS Decimal adjust for subtraction
DEC Decrement by 1
DIV Unsigned divide
ENTER Make stack frame (for procedure parameters)
ESC Escape
HLT Halt
IDIV Integer divide
IMUL Integer multiply
IN Input from port
INC Increment by 1
INS Input string from port
INT Call to interrupt procedure
INTO Interrupt on overflow
IRET Interrupt on return
JA Jump on above
JAE Jump on above or equal
JB Jump on below
JBE Jump on below or equal
JC Jump on carry
JCXZ Jump on CX zero
JE Jump on equal
JG Jump on greater
JGE Jump on greater or equal
JL Jump on less than
JLE Jump on less than or equal
JMP Jump unconditionally
JNA Jump on not above
JNAE Jump on not above or equal
JNB Jump on not below
JNBE Jump on not below or equal
JNC Jump on no carry
JNE Jump on not equal
JNG Jump on not greater
JNGE Jump on not greater or equal
JNL Jump on not less than
JNLE Jump on not less than or equal
JNO Jump on not overflow
JNP Jump on not parity
JNS Jump on not sign
JNZ Jump on not zero
JO Jump on overflow
JP Jump on parity
JPE Jump on parity even
JPO Jump on parity odd
JS Jump on sign
JZ Jump on zero
LAHF Load AH with flags
LAR Load access-rights byte
LDS Load pointer into DS
LEA Load effective address
LEAVE High-level procedure exit
LES Load pointer into ES
LGDT Load global descriptor table
LIDT Load interrupt descriptor table
LLDT Load local descriptor table
LMSW Load machine status word
LOCK Lock the bus
LODS Load string
LODSB Load byte (string)
LODSW Load word (string)
LOOP Loop
LOOPE Loop while equal
LOOPNE Loop while not equal
LOOPNZ Loop while not zero
LOOPZ Loop while zero
LSL Load segment limit
LTR Load task register
MOV Move data
MOVS Move data from string to string
MOVSB Move byte (string)
MOVSW Move word (string)
MUL Multiply
NEG Negate
NOP No operation
NOT Logical NOT
OR Logical OR
OUT Output to port
OUTS Output string to port
POP Pop top of stack
POPA Pop eight 16-bit registers
POPF Pop stack into flags
PUSH Push onto stack
PUSHA Push eight 16-bit registers
PUSHF Push flags onto stack
RCL Rotate through carry left
RCR Rotate through carry right
REP Repeat
REPE Repeat while equal
REPNE Repeat while not equal
REPNZ Repeat while not zero
REPZ Repeat while zero
RET Return
ROL Rotate left
ROR Rotate right
SAHF Store AH into flags
SAL Shift arithmetic left
SAR Shift arithmetic right
SBB Subtract with borrow
SCAS Scan string
SCASB Scan byte (string)
SCASW Scan word (string)
SGDT Store global descriptor table
SHL Shift logical left
SHR Shift logical right
SIDT Store interrupt descriptor table
SLDT Store local descriptor table
SMSW Store machine status word
STC Set carry flag
STD Set direction flag
STI Set interrupt flag
STOS Store string
STOSB Store byte (string)
STOSW Store word (string)
STR Store task register
SUB Subtract
TEST Logical compare
VERR Verify a segment for reading
VERW Verify a segment for writing
WAIT Enter wait state
XCHG Exchange
XLAT Translate
XOR Exclusive OR
The 80386 Instruction Set
╓┌─────────────────────┌─────────────────────────────────────────────────────╖
Mnemonic Description
──────────────────────────────────────────────────────────────────
AAA ASCII adjust after addition
AAD ASCII adjust before division
AAM ASCII adjust after multiplication
AAS ASCII adjust after subtraction
ADC Add with carry
ADD Add
AND Logical AND
ARPL Adjust RPL field of selector
BOUND Check array index against bounds
BSF Bit scan forward
BSR Bit scan reverse
BT Bit test
BTC Bit test and complement
BTR Bit test and reset
BTS Bit test and set
CALL Call procedure
CBW Convert byte to word
CDQ Convert doubleword to quad word
CLC Clear carry flag
CLD Clear direction flag
CLI Clear interrupt flag
CLTS Clear task switched flag
CMC Complement carry flag
CMP Compare
CMPS Compare string
CMPSB Compare byte string
CMPSD Compare doubleword string
CMPSW Compare word string
CWD Convert word to doubleword
DAA Decimal adjust for addition
DAS Decimal adjust for subtraction
DEC Decrement by 1
DIV Unsigned divide
ENTER Make stack frame (for procedure parameters)
ESC Escape
HLT Halt
IDIV Integer divide
IMUL Integer multiply
IN Input from port
INC Increment by 1
INS Input string from port
INSD Input doubleword from port
INT Call to interrupt procedure
INTO Interrupt on overflow
IRET Interrupt on return
IRETD Interrupt return to virtual 8086 mode
JA Jump on above
JAE Jump on above or equal
JB Jump on below
JBE Jump on below or equal
JC Jump on carry
JCXZ Jump on CX zero
JE Jump on equal
JECXZ Jump on ECX zero
JG Jump on greater
JGE Jump on greater or equal
JL Jump on less than
JLE Jump on less than or equal
JMP Jump unconditionally
JNA Jump on not above
JNAE Jump on not above or equal
JNB Jump on not below
JNBE Jump on not below or equal
JNC Jump on no carry
JNE Jump on not equal
JNG Jump on not greater
JNGE Jump on not greater or equal
JNL Jump on not less than
JNLE Jump on not less than or equal
JNO Jump on not overflow
JNP Jump on not parity
JNS Jump on not sign
JNZ Jump on not zero
JO Jump on overflow
JP Jump on parity
JPE Jump on parity even
JPO Jump on parity odd
JS Jump on sign
JZ Jump on zero
LAHF Load AH with flags
LAR Load access-rights byte
LDS Load pointer into DS
LEA Load effective address
LEAVE High-level procedure exit
LES Load pointer into ES
LFS Load pointer into FS
LGDT Load global descriptor table
LGS Load pointer into GS
LIDT Load interrupt descriptor table
LLDT Load local descriptor table
LMSW Load machine status word
LOCK Lock the bus
LODS Load string
LODSB Load byte (string)
LODSD Load doubleword (string)
LODSW Load word (string)
LOOP Loop
LOOPE Loop while equal
LOOPNE Loop while not equal
LOOPNZ Loop while not zero
LOOPZ Loop while zero
LSL Load segment limit
LSS Load pointer into SS
LTR Load task register
MOV Move data
MOVS Move data from string to string
MOVSB Move byte (string)
MOVSD Move doubleword (string)
MOVSW Move word (string)
MOVSX Move with sign extend
MOVZX Move with zero extend
MUL Multiply
NEG Negate
NOP No operation
NOT Logical NOT
OR Logical OR
OUT Output to port
OUTS Output string to port
POP Pop top of stack
POPA Pop eight 16-bit registers
POPAD Pop eight 32-bit registers
POPF Pop stack into flags
POPFD Loads doubleword into EFLAGS
PUSH Push onto stack
PUSHA Push eight 16-bit registers
PUSHAD Push eight 32-bit registers
PUSHED Push EFLAGS
PUSHF Push flags onto stack
RCL Rotate through carry left
RCR Rotate through carry right
REP Repeat
REPE Repeat while equal
REPNE Repeat while not equal
REPNZ Repeat while not zero
REPZ Repeat while zero
RET Return
ROL Rotate left
ROR Rotate right
SAHF Store AH into flags
SAL Shift arithmetic left
SAR Shift arithmetic right
SBB Subtract with borrow
SCAS Scan string
SCASB Scan byte (string)
SCASD Scan doubleword (string)
SCASW Scan word (string)
SET Byte set on condition
SGDT Store global descriptor table
SHL Shift logical left
SHLD Double precision shift left
SHR Shift logical right
SHRD Double precision shift right
SIDT Store interrupt descriptor table
SLDT Store local descriptor table
SMSW Store machine status word
STC Set carry flag
STD Set direction flag
STI Set interrupt flag
STOS Store string
STOSB Store byte (string)
STOSD Store doubleword (string)
STOSW Store word (string)
STR Store task register
SUB Subtract
TEST Logical compare
VERR Verify a segment for reading
VERW Verify a segment for writing
WAIT Enter wait state
XCHG Exchange
XLAT Translate
XOR Exclusive OR
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