MICROPROCESSOR EMU8086 - ASSEMBLER AND EMULATOR
Code: Basic Instructions
ORG 100H ;
Program starts from 100H address in RAM [Usually first line in the program]
MOV AX,1004H ;
Stores the 16 bit hex number in AX register
MOV BX,1004 ;
Stores the decimal value in BX register
MOV CX,10101B ;
Stores the binary number in CX register
MOV DH,12H ;
Stores the 8 bit hex number in UPPER 8 bit of DX register
XCHG AX,BX ;
Exchanges the contents of AX and BX register
RET ;
Program terminates here [Usually last line of the program]
Code
01: Declaring variables
ORG 100H
MOV AX,1004H
;[Stores 1004h into the AX register]
MOV CX, EEE1
;[Stores the content in variable EEE1 into the AX register]
RET
EEE1 DW 1130H ; [Declares a variable]
Code
02: Declaring Array
ORG 100H
MOV AX,1004H
;[Stores 1004h into the AX register]
MOV CX, EEE1
;[Stores the content in variable EEE1 into the AX register]
MOV DX, EEE2[6]
;[Stores the content of fourth element in the variable array EEE2 into
DX register ]
RET
EEE1 DW 1130H
;[Declares a variable]
EEE2 DW 1096H,4A43H,5FC2H,0D3B2H ;[Declares an array of variables]
Code
03: Accessing array with SI register
ORG 100H
MOV SI,4 ; Stores
the desired array index value into SI register
MOV AX,SU[SI] ; Points the desired array value through SI
register, same as using SU[2]
RET
SU DW 1243H,6678H,12A6H,90D5H
Code
04: Addition Operation
ORG 100H
MOV AX,1234H ;[Stores
the value 1234H into AX register]
MOV BX, 1CD5H ;[Stores the value 1CD5H into BX register]
MOV CX,1452H ;[Stores
the value 1452H into CX register]
ADD BX,AX ;[ ADD
the contents of AX and BX and stores the result into BX]
ADD AX, 6723H ;[ADD AX with 6723H and stores the result into
AX]
ADD BX,EEE2[2] ;[ADD
BX with the content of EEE1 and stores the result into BX]
ADD CX, EEE2 [4]
;[ADD CX with the content at third element in EEE2 array and stores the
result into CX]
RET
EEE1 DW 1130H
EEE2 DW 1235H,0C451H,1125H
Code
05: Subtraction Operation:
ORG 100H
MOV AX,1234H ;[Stores
the value 1234H into AX register]
MOV BX, 1CD5H ;[Stores the value 1CD5H into BX register]
MOV CX,1452H ;[Stores
the value 1452H into CX register]
SUB BX,AX
SUB AX, 6723H
SUB BX,EEE2[2]
SUB CX, EEE2 [4]
RET
EEE1 DW 1130H
EEE2 DW 1235H,0C451H,1125H
Code#06: Multiplication Operation
ORG 100H
MOV AX,1234H
MOV BX,1267H
MUL BX ;[Multiplies the contents of AX and BX and stores in
DX:AX]
MUL EEE1 ;[Multiplies the contents of AX and EEE1 array and
stores in DX:AX]
MUL EEE2 [2] ;[Multiplies the contents of AX and EEE[2] and
stores in DX:AX]
MUL AX ; [Multiplies the contents of AX and AX and stores in
DX:AX]
RET
EEE1 DW 1130H
EEE2 DW 1096H,4A43H,5FC2H,0D3B2H
Code 07: Division Operation
ORG 100H
MOV AX,3A57H
MOV DX,12H
MOV BX,232H
DIV BX
DIV EEE1
DIV EEE2[4]
RET
EEE1 DW 1130H
EEE2 DW 1096H,4A43H,5FC2H,0D3B2H
Exercise:
An array
named ‘EEE18’ contains four values as X1, X2, X3, X4. Write a code in assembly
language that will perform the following operation:
((X1+X2)
*X3) / X4
ORG 100H
MOV
AX,EEE18[0]
ADD
AX,EEE18[2]
MUL EEE18[4]
DIV EEE18[6]
RET
EEE18 DW
1111H,23F5H,214DH,550AH
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