(a) Write a program using 8086 assembly Language (with proper comments

Question

(a) Write a program using 8086 assembly Language (with proper comments) that accepts four different digits input from the keyboard. Each digit is first converted to binary equivalent and then smallest of these digits is put in AL register. This AL register is to be added in each value of a byte array of size 9, which is stored in the memory. You may assume the byte array has the value 01h, 03h 02h, 03h, 00h, 01h, 02h, 01h, 04h. Make suitable assumptions, if any.

(b) Write a NEAR subroutine using 8086 assembly Language (with proper comments) that returns the largest value in a byte array of length 4-bytes. All the four values of the byte array are passed to the subroutine in a stack. You should write both the calling program and subroutine.

(i) Use of segment registers with the help of example (ii) Interrupt handling in 8086 micro-processor

(iii)Any four bit manipulation instructions in 8086 micro-processor

15 Sep 2022

Answer :

Word Count : 1642

(a)

Here is the 8086 assembly program to accept four different digits input from the keyboard, convert them to binary, find the smallest digit and add it to each value of a byte array of size 9 stored in memory:

DATA SEGMENT
NUMS DB 01h, 03h, 02h, 03h, 00h, 01h, 02h, 01h, 04h
;byte array of size 9
SMALLEST DB 0 ;variable to store smallest digit
DATA ENDS

CODE SEGMENT
ASSUME CS:CODE, DS:DATA
START:
MOV AX, DATA
MOV DS, AX ;initialize data segment

;accept four different digits input from the keyboard
MOV AH, 01h ;function to read character from keyboard
INT 21h ;interrupt to read character from keyboard
SUB AL, 30h ;convert character to digit
MOV BL, AL ;store digit in BL
MOV AH, 01h
INT 21h
SUB AL, 30h
MOV CL, AL ;store digit in CL
MOV AH, 01h
INT 21h
SUB AL, 30h
MOV DL, AL ;store digit in DL
MOV AH, 01h
INT 21h
SUB AL, 30h
MOV DH, AL ;store digit in DH

;convert each digit to binary and find the smallest digit
MOV AL, BL
MOV BL, 2
MUL BL ;multiply by 2 to convert to binary
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