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ASM 8086 Cheat Sheet by

ASM 8086
programming     asm     8086     assembly

Registers

AX
Accumu­lator; used to store some calcul­ation results
BX
Base; index register for MOVE
CX
Counter; count for string operations & shifts
DX
Datas; port address for IN and OUT
SP
Points to top of stack
BP
Points to base of stack frame
SI
Points to a source in stream operations
DI
Points to a destin­ation in stream operations
CS
Points to base of segment containing code
DS
Points to base of segment containing datas
SS
Points to base of segment containing the stack
ES
Points to base of an additi­onnal segment
IP
Points to the next instru­ction to be run

Loops

LOOP
Decrements CX and jumps to label if CX <> 0
LOOPE LOOPZ
Decrements CX and jumps to label if CX <> 0 and ZF = 1
LOOPNE LOOPNZ
Decrements CX and jumps to label if CX <> 0 and ZF = 0
JCXZ
Jumps to label if CX = 0
Reme­mber: Loops uses CX and ZF registers
 

Instru­ctions

Inst­ruc­tion
Usage
Exam­ple
MOV
Assigns value to register
MOV AX, 15h
ADD
Adds value to register
ADD AX, BX
SUB
Substracts value to register
SUB AX, 1
AND
Executes binary AND operation
AND AL, 1101111b
OR
Executes binary OR operation
OR AL, BX
NOT
Executes binary NOT operation
NOT AL
XOR
Executes binary XOR operation
XOR AL, 01010101b
SHL/SA­L/S­HR/SAR
Shifts to the left or to the right. When arithm­etic, the sign bit doesn't shift. Explused bit is stocked in CF
SHL AL, 1 / SAL AL, 2
ROL/RC­L/R­OR/RCR
Rotates to the left or to the right, using or not CF
ROL AL, 1 / RCR AL, 2
INC / DEC
Increments or decrements a value
INC AX / DEC BX
ADC / SBB
Does an addition or substr­action of >16bits numbers, by storing restraint in CF
ADC AX, CX
STC / CLS / CMC
Sets CF to 1, 0 or inverts it
STC
STD / CLD
Sets DF to 1 or 0
STD
STI / CLI
Sets IF to 1 or 0
CLI
MUL / IMUL / DIV / IDIV
Multiplies or divides two numbers and stores it to AX (+DX for most signif­icant bit)
MOV AL, 0001Ah MUL 00002h
JMP
Jumps to a label
JMP calc
CMP
Performs a comparison
CMP AL, 01234b
PUSH / PUSHA / PUSHF
Pushes a data to SS:[SP] / all registers / FLAGS
PUSH 10h
POP / POPA / POPF
Restores fatas form SS:[SP] / all registers (except SP) / FLAGS
POP AX
 

Condit­ional jumps

Inst­ruc­tion
Desc­rip­tion
Cond­ition
JA
Jump if Above
CF = 0 and ZF = 0
JAE
Jump if Above or Equal
CF = 0
JB
Jump if Below
CF = 1
JBE
Jump if Below or Equal
CF = 1 or ZF = 1
JC
Jump if Carry
CF = 1
JE
Jump if Equal
ZF = 1
JG
Jump if Greater
ZF = 0 and SF = OF
JGE
Jump if Greater of Equal
SF = OF
JL
Jump if Less
SF <> OF
JLE
Jump if Less or Equal
ZF = 1 or SF <> OF
JO
Jump if Overflow
OF = 1
JP
Jump if Parity
PF = 1
JPE
Jump if Parity Even
PF = 1
JS
Jump if Sign
SF = 1
JZ
Jump if Zero
ZF = 1

Colors

Deci­mal
Hexa
Binary
Color
0
00h
0000b
Black
1
01h
0001b
Blue
2
02h
0010b
Green
3
03h
0011b
Colbalt blue
4
04h
0100b
Red
5
05h
0101b
Violet
6
06h
0110b
Brown
7
07h
0111b
Light grey
8
08h
1000b
Dark grey
9
09h
1001b
Light blue
10
0Ah
1010b
Light green
11
0Bh
1011b
Light cobalt
12
0Ch
1100b
Light red
13
0Dh
1101b
Light violet
14
0Eh
1110b
Yellow
15
0Fh
1111b
White

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