AMP Appendappix1 Eng

“Politehnica” University of Bucharest Microprocessors’ Architecture – Lab guide

Electronics, Telecommunications and Information Technology Faculty Appendix

© Corneliu Burileanu

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Appendix

Intel x86 compatible processors’ instruction set

We convene upon the following notations:

s: source;d: destination;AL|AX: default accumulator (8 or 16 bits);mem: the content of a memory location or two successive memory locations addressed through

one of the permitted addressing modes for data memory (except immediate addressing);

mem16: the content of two successive memory locations addressed through one of the permitted addressing modes for data memory (except immediate addressing);

mem32: the content of four successive memory locations addressed through one of the permitted addressing modes for data memory (except immediate addressing);

r|ri|rj: a common 8 bit or 16 bit register (except segment registers);r8: an 8 bit register (except segment registers);r16: a 16 bit register (except segment registers);rs: a segment register;data: an 8 or 16 bit operand coded in the instruction format (immediate addressing);data8: an 8 bit operand coded in the instruction format (immediate addressing);data16: a 16 bit operand coded in the instruction format (immediate addressing);disp8: an 8 bit displacement (coded in the instruction format);disp16: a 16 bit displacement (coded in the instruction format);adr: a complete, 16 bit address;adr8: a short, 8 bit address;adr32: a logical, 32 bit address;port: the address (index) of an input/output (8 bit) porttip: an 8 bit operand coded in the instruction format that specifies the type of an interrupt;nrcel: the number of cells that an operand can be shifted or rotated with;AE: effective address;

Flags notations:

x: the flag’s value changes according to the instruction result;1: the flag is unconditionally set;0: the flag is unconditionally reset;?: the flag’s value changes unpredictably;blank: the flag’s value is not modified by the instruction;




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Number of states calculus:

cAE – effective address calculus time (measured in number of states):direct addressing:

AE = disp8|disp16 6 statesindexed addressing:

AE = (SI)|(DI) + disp8|disp16 9 statesindirect implicit addressing:

AE = (SI)|(DI) 5 statesdirect base relative addressing (no displacement):

AE = (BX) 5 statesdirect base relative addressing (with displacement):

AE = (BX) + disp8|disp16 9 statesindexed base relative addressing:

AE = (BX) + (SI)|(DI) + disp8|disp16 12 statesimplicit base relative addressing:

AE = (BX) + (SI)|(DI) 8 statesdirect stack addressing (no displacement):

AE = (BP) 5 statesdirect stack addressing (with displacement):

AE = (BP) + disp8|disp16 9 statesindexed stack addressing:

AE = (BP) + (SI)|(DI) + disp8|disp16 12 statesimplicit stack addressing:

AE = (BP) + (SI)|(DI) 8 states




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ASCII adjustment OF DF IF TF SF ZF AF PF CFAAA for addition ? ? ? x ? x

Operands No. of states

Bytes Examples

4 1 AAA

ASCII adjustment OF DF IF TF SF ZF AF PF CFAAD for division ? x x ? x ?

(done before the division)


Bytes Examples

60 2 AAD

ASCII adjustment OF DF IF TF SF ZF AF PF CFAAM for multiplication ? x x ? x ?

(done after themultiplication)


Bytes Examples

83 1 AAM

ASCII adjustment OF DF IF TF SF ZF AF PF CFAAS for subtraction ? ? ? x ? x


Bytes Examples

4 1 AAS




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Add with carry OF DF IF TF SF ZF AF PF CFADC d,s x x x x x x


Bytes Examples

AL|AX, data 4 2-3 ADC AX,9D81Hr, data 4 3-4 ADC CL,36Hmem, data 17+cAE 3-6 ADC [SI],2D31Hr1, r2 3 2 ADC BX,SI

r, mem 9+cAE 2-4 ADC AX,[BX]mem, r 16+cAE 2-4 ADC [BX+SI+64H],DI

OF DF IF TF SF ZF AF PF CFADD d,s Add without carry x x x x x x


Bytes Examples

AL|AX, data 4 2-3 ADD AX,0F0FHr, data 4 3-4 ADD DX,0F0F0Hmem, data 17+cAE 3-6 ADD [100H],2Hr1, r2 3 2 ADD SI,CXr, mem 9+cAE 2-4 ADD DI,[BX+22H]mem, r 16+cAE 2-4 ADD [BX+SI],CL

OF DF IF TF SF ZF AF PF CFAND d,s Logical AND 0 x x ? x 0


Bytes Examples

AL|AX, data 4 2-3 AND AL,7FHr, data 4 3-4 AND CX,0F0Hmem, data 17+cAE 3-6 AND [BX],01010000Br1, r2 3 2 AND AL,BLr, mem 9+cAE 2-4 AND DL,[BX+SI]mem, r 16+cAE 2-4 AND [DI+10H],AL




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OF DF IF TF SF ZF AF PF CFCALL adr Subprogram call


Bytes Examples

adr32 28 5 CALL PROC-ALT-SEGdisp16 28 3 CALL SUMAr16 16 2 CALL BXmem* 21+cAE 2-4 CALL [BX]mem** 37+cAE 2-4 CALL [SI]* subprogram call with indirect addressing defined by the assembler directive as intra-segment call;** subprogram call with indirect addressing defined by the assembler directive as inter-segment call.

Byte to word OF DF IF TF SF ZF AF PF CFCBW conversion

(with sign)Operands No. of

statesBytes Examples

2 1 CBW

OF DF IF TF SF ZF AF PF CFCLC Clear carry flag 0


Bytes Examples

2 1 CLC

OF DF IF TF SF ZF AF PF CFCLD Clear direction 0

flagOperands No. of


2 1 CLD

Clear interrupt OF DF IF TF SF ZF AF PF CFCLI enable flag 0


Bytes Examples

2 1 CLI




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OF DF IF TF SF ZF AF PF CFCMC Complement carry x

flagOperands No. of


2 1 CMC

OF DF IF TF SF ZF AF PF CFCMP s1,s2 Compare operands x x x x x x


Bytes Examples

AL|AX, data 4 2-3 CMP AL,0DHr, data 4 3-4 CMP SI,200Hmem, data 17+cAE 3-6 CMP [BX+DI+55H],2222Hr1, r2 3 2 CMP CL,DH

r, mem 9+cAE 2-4 CMP DH,[4321H]mem, r 16+cAE 2-4 CMP [BP+2],SI

Compare the current OF DF IF TF SF ZF AF PF CFCMPS elements of two x x x x x x

arraysOperands No. of


22 1 CMPSB ;bytes comparison22 1 CMPSW ;words comparison

Obs.: CMPS can be prefixed by one of the repeatability prefixes: REP, REPE|REPZ orREPNE|REPNZ; these prefixes add 9 more states.

Word to double word OF DF IF TF SF ZF AF PF CFCWD conversion

(with sign)Operands No. of


5 1 CWD




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Decimal adjustment OF DF IF TF SF ZF AF PF CFDAA for addition ? x x x x x


Bytes Examples

4 1 DAA

Decimal adjustment OF DF IF TF SF ZF AF PF CFDAS for subtraction ? x x x x x


Bytes Examples

4 1 DAS

OF DF IF TF SF ZF AF PF CFDEC s Decrement source x x x x x


Bytes Examples

r16 2 1 DEC CXr8 3 2 DEC BHmem 15+cAE 2-4 DEC [SI+20H]

OF DF IF TF SF ZF AF PF CFDIV s Division ? ? ? ? ? ?


Bytes Examples

r8 80- 90 2 DIV BLr16 144-162 2 DIV CXmem8 86- 96+

cAE2-4 DIV [400H]

mem16 150-168+ cAE

2-4 DIV [SI+10H]

OF DF IF TF SF ZF AF PF CFESC s Escape


Bytes Examples

mem 7 + cAE 2-4 ESC [BX+SI]




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OF DF IF TF SF ZF AF PF CFHLT Halt processor


Bytes Examples

2 1 HLT

Signed integer OF DF IF TF SF ZF AF PF CFIDIV s division ? ? ? ? ? ?


Bytes Examples

r8 101-112 2 IDIV CLr16 165-184 2 IDIV BXmem8 107-118+

cAE2-4 IDIV [SI+100H]

mem16 171-190+ cAE

2-4 IDIV [BX+1000H]

Signed integer OF DF IF TF SF ZF AF PF CFIMUL s multiply x ? ? ? ? x


Bytes Examples

r8 80- 98 2 IMUL CLr16 128-154 2 IMUL BXmem8 86-104+

cAE2-4 IMUL [BX]

mem16 134-160+ cAE

2-4 IMUL [BP+DI+30H]

Input from port OF DF IF TF SF ZF AF PF CFIN d,s (to accumulator)


Bytes Examples

AL|AX, port 10 2 IN AL,1FHAL|AX, DX 8 1 IN AX,DX




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OF DF IF TF SF ZF AF PF CFINC s Increment source x x x x x


Bytes Examples

r16 2 1 INC SIr8 3 2 INC BLmem 15+cAE 2-4 INC [BX+SI]

OF DF IF TF SF ZF AF PF CFINT [tip] Software interrupt 0 0

requestOperands No. of


52 1 INT ; type 3 interrupttip (tip<>3) 51 2 INT 67

Interrupt on OF DF IF TF SF ZF AF PF CFINTO overflow (type 4) 0 0


Bytes Examples

53 or 4 1 INTO

OF DF IF TF SF ZF AF PF CFIRET Interrupt return x x x x x x x x x


Bytes Examples

24 1 IRET

Jump if above | OF DF IF TF SF ZF AF PF CFJA | JNBE Jump if not below disp8 or equal (unsigned)


Bytes Examples

disp8 16 or 4 2 JA ET1 ;jump if ;(CF) or (ZF) = 0




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Jump if above or OF DF IF TF SF ZF AF PF CFJAE|JNB|JNC equal | jump if not disp8 below | jump if not

carry (unsigned)Operands No. of


disp8 16 or 4 2 JAE ET2 ;jump if (CF)=0

jump if below | OF DF IF TF SF ZF AF PF CFJB|JNAE|JC jump if not above disp8 or equal | jump if

carry (unsigned)Operands No. of


disp8 16 or 4 2 JB ET3 ;jump if (CF)=1

OF DF IF TF SF ZF AF PF CFJCXZ disp8 jump if (CX) = 0


Bytes Examples

disp8 16 or 4 2 JCXZ GATA

Jump if equal | OF DF IF TF SF ZF AF PF CFJE | JZ jump if zero disp8 (signed)


Bytes Examples

disp8 16 or 4 2 JZ ET5 ;jump if (ZF)=1

Jump if below or OF DF IF TF SF ZF AF PF CFJBE | JNA equal | jump if not disp8 above (unsigned)


Bytes Examples

disp8 16 or 4 2 JNA ET4 ;jump if;(CF)=1 or (ZF)=1




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Jump if greater | OF DF IF TF SF ZF AF PF CFJG | JNLE jump if not lower disp8 or equal (signed)


Bytes Examples

disp8 16 or 4 2 JG ET6 ;jump if;((SF)(OF))or(ZF)=0

Jump if greater or OF DF IF TF SF ZF AF PF CFJGE | JNL equal | jump if not disp8 lower (signed)


Bytes Examples

disp8 16 or 4 2 JGE ET7 ;jump if;(SF)(OF)=0

Jump if lower OF DF IF TF SF ZF AF PF CFJL | JNGE | jump if not disp8 greater or equal

(signed)Operands No. of


disp8 16 or 4 2 JL ET8 ;jump if;(SF)(OF)=1

Jump if lower or OF DF IF TF SF ZF AF PF CFJLE | JNG equal | jump if disp8 not greater

(signed)Operands No. of


disp8 16 or 4 2 JNG ET9 ;jump if;((SF)(OF))or(ZF)=1




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OF DF IF TF SF ZF AF PF CFJMP adr Jump

(unconditioned)Operands No. of


adr32 15 5 JMP OTHER_SEGMENT_LABELdisp16 15 3 JMP IN_SEGMENT_LABELdisp8 15 2 JMP SHORT_JUMP_LABELr16 11 2 JMP CXmem* 18+cAE 2-4 JMP [BX+100H]mem** 24+cAE 2-4 JMP [DI]* jump with indirect addressing defined by the assembler directive as intra-segment jump;** jump with indirect addressing defined by the assembler directive as inter-segment jump;

Jump if not equal | OF DF IF TF SF ZF AF PF CFJNE | JNZ jump if not zero disp8 (signed)


Bytes Examples

disp8 16 or 4 2 JNE ET10 ;jump if (ZF)=0

Jump if not OF DF IF TF SF ZF AF PF CFJNO disp8 overflow


Bytes Examples

disp8 16 or 4 2 JNO ET11 ;jump if (OF)=0

Jump if not parity OF DF IF TF SF ZF AF PF CFJNP | JPO | jump if parity

disp8 oddOperands No. of


disp8 16 or 4 2 JPO ET12 ;jump if (PF)=0




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Jump if not sign OF DF IF TF SF ZF AF PF CFJNS disp8


Bytes Examples

disp8 16 or 4 2 JNS ET13 ;jump if (SF)=0

OF DF IF TF SF ZF AF PF CFJO disp8 Jump if overflow


Bytes Examples

disp8 16 or 4 2 JO ET14 ;jump if (OF)=1

Jump if parity | OF DF IF TF SF ZF AF PF CFJP | JPE jump if parity even

disp8Operands No. of


disp8 16 or 4 2 JPO ET15 ;jump if (PF)=1

OF DF IF TF SF ZF AF PF CFJS disp8 Jump if sign


Bytes Examples

disp8 16 or 4 2 JS ET16 ;jump if (SF)=1

OF DF IF TF SF ZF AF PF CFLAHF Load flags into AH


Bytes Examples

4 1 LAHF




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Load register OF DF IF TF SF ZF AF PF CFLDS d,s (destination) and

data segment (DS)Operands No. of


r16, mem32 16+cAE 2-4 LDS SI,[10H]

Load register OF DF IF TF SF ZF AF PF CFLEA d,s (destination) with

effective addressOperands No. of


r16, mem16 2+cAE 2-4 LEA BX,[BX+SI+0FFFH]

Load register OF DF IF TF SF ZF AF PF CFLES d,s (destination) and

extended data segment (ES)


Bytes Examples

r16, mem32 16+cAE 2-4 LES DI,[BX]

OF DF IF TF SF ZF AF PF CFLOCK Lock the system bus


Bytes Examples

mem 2 1 LOCK XCHG CL,BL

Load string OF DF IF TF SF ZF AF PF CFLODS Loads the current

string component into the accumulator


Bytes Examples

12 1 LODSB ; loads one byte12 1 LODSW ; loads one word




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OF DF IF TF SF ZF AF PF CFLOOP disp8 Unconditioned loop


Bytes Examples

disp8 9 or 5 2 LOOP CICLU_1

Loop if equal | OF DF IF TF SF ZF AF PF CFLOOPE|LOOPZ loop if zero



disp8 11 or 5 2 LOOPE CICLU_2

LOOPNE | Loop if not equal | OF DF IF TF SF ZF AF PF CFLOOPNZ loop if not zero



disp8 11 or 5 2 LOOPNE CICLU_3

Copies a byte or OF DF IF TF SF ZF AF PF CFMOV d,s word from source to

destinationOperands No. of


r, data 4 2-3 MOV CX,3168H, data 10+cAE 3-6 MOV [BX],491FHAL|AX, mem 10 3 MOV AL,[1064H]mem, AL|AX 10 3 MOV [1064H],AXr1, r2 2 2 MOV AX,CXr, mem 8+cAE 2-4 MOV BP,[BX+DELTA]mem, r 9+cAE 2-4 MOV [DI+100H],CXrs*, r16 2 2 MOV SS,DXrs*, mem16 8+cAE 2-4 MOV DS,[1000H]r16, rs 2 2 MOV BP,SSmem16, rs 9+cAE 2-4 MOV [2000H],CS* any segment register except CS




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Copies the current OF DF IF TF SF ZF AF PF CFMOVS component of the

source string into the current component of the destination string


Bytes Examples

18 1 MOVSB ; moves one byte18 1 MOVSW ; moves one word

Obs.: MOVS can be prefixed by the repeatability prefix REP; this prefix adds 9 more states.

OF DF IF TF SF ZF AF PF CFMUL s Unsigned integer x ? ? ? ? x

multiplicationOperands No. of


r8 70- 77 2 MUL BLr16 118-133 2 MUL CXmem8 76- 83+

cAE2-4 MUL [SI+300H]

mem16 124-139+ cAE

2-4 MUL [200H]

Negate source OF DF IF TF SF ZF AF PF CFNEG s (2’s complement) x x x x x 1*


Bytes Examples

r 3 2 NEG ALmem 16+cAE 2-4 NEG [BX]* (CF) = 0 if (s) = 0H

Logical NOT OF DF IF TF SF ZF AF PF CFNOT s (1’s complement)


Bytes Examples

r 3 2 NOT BLmem 16+cAE 2-4 NOT [1000H]




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OF DF IF TF SF ZF AF PF CFOR d,s Logical OR 0 x x ? x 0


Bytes Examples

AL|AX, data 4 2-3 OR AX,3030Hr, data 4 3-4 OR CX,001FHmem, data 17+cAE 3-6 OR [BX+DI],1F1FHr1, r2 3 2 OR AH,BH

r, mem 9+cAE 2-4 OR DX,[DI]mem, r 16+cAE 2-4 OR [BX],AX

Output to port OF DF IF TF SF ZF AF PF CFOUT d,s (from accumulator)


Bytes Examples

port, AL|AX 10 2 OUT 44,AXDX, AL|AX 8 1 OUT DX,AL

Pop from stack OF DF IF TF SF ZF AF PF CFPOP d (to destination)


Bytes Examples

r16 8 1 POP BXmem16 17+cAE 2-4 POP [SI]rs (nu CS) 8 1 POP ES

Pop from stack to OF DF IF TF SF ZF AF PF CFPOPF flags register x x x x x x x x x


Bytes Examples

8 1 POPF




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Push (source) on OF DF IF TF SF ZF AF PF CFPUSH s stack


Bytes Examples

r16 11 1 PUSH SImem16 16+cAE 2-4 PUSH [BX]rs 10 1 PUSH DS

Push the flags OF DF IF TF SF ZF AF PF CFPUSHF register on stack


Bytes Examples

10 1 PUSHF

OF DF IF TF SF ZF AF PF CFRCL s, nrcel Rotate carry left x x


Bytes Examples

r, 1 2 2 RCL AX,1r, CL 8

+4/bit2 RCL BL,CL

mem, 1 15+cAE 2-4 RCL ALFA,1mem, CL 20+cAE

+4/bit2-4 RCL [DI+ALFA],CL

OF DF IF TF SF ZF AF PF CFRCR s, nrcel Rotate carry right x x


Bytes Examples

r, 1 2 2 RCR BX,1r, CL 8

+4/bit2 RCR CX,CL

mem, 1 15+cAE 2-4 RCR [BX+20],1mem, CL 20+cAE

+4/bit2-4 RCR [SI],CL




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Repeat OF DF IF TF SF ZF AF PF CFREP (unconditionally)

string operationOperands No. of


9 1 REP MOVSB

Repeat while equal OF DF IF TF SF ZF AF PF CFREPE | REPZ | while zero the

CMPS or SCAS instruction


Bytes Examples

9 1 REPE CMPSB

Repeat while not OF DF IF TF SF ZF AF PF CFREPNE|REPNZ equal | while not

zero the CMPS or SCAS instruction


Bytes Examples

9 1 REPNE SCASW

Return from OF DF IF TF SF ZF AF PF CFRET [data16] subprogram


Bytes Examples

8 1 RET ;intra-segmentdata16 12 3 RET 4 ;intra-segment

18 1 RET ;inter-segmentdata16 17 3 RET 2 ;inter-segment




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OF DF IF TF SF ZF AF PF CFROL s, nrcel Rotate left x x


Bytes Examples

r, 1 2 2 ROL DI,1r, CL 8

+4/bit2 ROL BX,CL

mem, 1 15+cAE 2-4 ROL [DI+DELTA],1mem, CL 20+cAE

+4/bit2-4 ROL [BX+DI],CL

OF DF IF TF SF ZF AF PF CFROR s, nrcel Rotate right x x


Bytes Examples

r, 1 2 2 ROR CX,1r, CL 8

+4/bit2 ROR BX,CL

mem, 1 15+cAE 2-4 ROR [SI],1mem, CL 20+cAE

+4/bit2-4 ROR BETA,CL

Store AH in the OF DF IF TF SF ZF AF PF CFSAHF flags register (F) x x x x x


Bytes Examples

4 1 SAHF

Shift right OF DF IF TF SF ZF AF PF CFSAL | SHL arithmetic | x x x ? x x s,nrcel logical


Bytes Examples

r, 1 2 2 SHL AL,1r, CL 8

+4/bit2 SAL SI,CL

mem, 1 15+cAE 2-4 SHL [DI+100H],1mem, CL 20+cAE

+4/bit2-4 SHL [BP+SI],CL




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Shift arithmetic OF DF IF TF SF ZF AF PF CFSAR s, nrcel right x x x ? x x


Bytes Examples

r, 1 2 2 SAR AH,1r, CL 8

+4/bit2 SAR DI,CL

mem, 1 15+cAE 2-4 SAR [BP],1mem, CL 20+cAE

+4/bit2-4 SAR [DI],CL

OF DF IF TF SF ZF AF PF CFSBB d,s Subtract with x x x x x x

borrowOperands No. of


AL|AX, data 4 2-3 SBB AX,4D2CHr, data 4 3-4 SBB CL,1mem, data 17+cAE 3-6 SBB [BP+SI],3F8Hr1, r2 3 2 SBB BL,DL

r, mem 9+cAE 2-4 SBB DI,[BX+ALFA]mem, r 16+cAE 2-4 SBB [SI+100],AX

Scan string OF DF IF TF SF ZF AF PF CFSCAS (compares the x x x x x x

current string element with the accumulator)


Bytes Examples

15 1 SCASB ; compares one byte15 1 SCASW ; compares one word

Obs.: CMPS can be prefixed by one of the repeatability prefixes: REP, REPE|REPZ orREPNE|REPNZ; these prefixes add 9 more states.




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Shift right OF DF IF TF SF ZF AF PF CFSHR s, nrcel (logical) x x x ? x x


Bytes Examples

r, 1 2 2 SHR BL,1r, CL 8

+4/bit2 SHR SI,CL

mem, 1 15+cAE 2-4 SHR [BP+SI],1mem, CL 20+cAE

+4/bit2-4 SHR [BX+DI+BETA],CL

OF DF IF TF SF ZF AF PF CFSTC Set carry flag 1


Bytes Examples

2 1 STC

OF DF IF TF SF ZF AF PF CFSTD Set direction flag 1


Bytes Examples

2 1 STDOF DF IF TF SF ZF AF PF CF

STI Set interrupt flag 1


Bytes Examples

2 1 STI




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Store string OF DF IF TF SF ZF AF PF CFSTOS (stores the current

component of the string in the accumulator)


Bytes Examples

11 1 STOSB ; store one byte11 1 STOSW ; store one word

Obs.: STOS can be prefixed by the repeatability prefix REP; this prefix adds 9 more states.

OF DF IF TF SF ZF AF PF CFSUB d,s Subtract x x x x x x


Bytes Examples

AL|AX, data 4 2-3 SUB AL,65Hr, data 4 3-4 SUB SI,5280mem, data 17+cAE 3-6 SUB [SI+14H],136Hr1, r2 3 2 SUB CX,BXr, mem 9+cAE 2-4 SUB DH,[BP+4]mem, r 16+cAE 2-4 SUB [BP+10],CL

Test OF DF IF TF SF ZF AF PF CFTEST s1,s2 (compares the two 0 x x ? x 0

values without storing the result)


Bytes Examples

AL|AX, data 4 2-3 TEST AX,0040Hr, data 5 3-4 TEST SI,0050mem, data 11+cAE 3-6 TEST [BP],00100000Br1, r2 3 2 TEST SI,DIr, mem 9+cAE 2-4 TEST AL,[55H]

OF DF IF TF SF ZF AF PF CFWAIT Wait for

coprocessorOperands No. of


1 WAIT




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OF DF IF TF SF ZF AF PF CFXCHG d,s Exchange values


Bytes Examples

r16 3 1 XCHG BX ;exchanges AX and BXr1, r2 4 2 XCHG AL,BLr, mem 17 + cAE 2-4 XCHG BX,[BP+SI]

OF DF IF TF SF ZF AF PF CFXLAT Translate byte


Bytes Examples

11 1 XLAT

OF DF IF TF SF ZF AF PF CFXOR d,s Logical Exclusive 0 x x ? x 0

OROperands No. of


AL|AX, data 4 2-3 XOR AX,5522Hr, data 4 3-4 XOR SI,00C2Hmem, data 17+cAE 3-6 XOR [BX+DI],2244Hr1, r2 3 2 XOR CX,BXr, mem 9+cAE 2-4 XOR AX,[SI]mem, r 16+cAE 2-4 XOR [SI+ALFA],DX

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