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IGNOU BCSL-022 Assembly Language Programming Lab Solved Assignments 2013-2014

IGNOU BCSL-022  Assembly Language Programming Lab Solved Assignments 2013-2014

Last Dates for Submission               :                 31st October, 2013/ 30th April, 2014

This assignment has two questions carrying a total of 40 marks. Rest 10 marks are for viva-voce. Please go through the guidelines regarding assignments given in the programme guide for the format of presentation.

1) Design a two bit counter circuit that counts at an increment of two with the starting count of 00. The states of the counter, thus, may be 00, 10, 00, 10… Use J-K flip flop to design the circuit. You must design them using state transition diagram and Karnaugh’s map.                                                                                                                                                                         (10 Marks)

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2) Write and run the following programs using 8086 assembly language. (30 Marks)

(a)     Write and run an Assembly language program that reverses a string. You may assume that the string is available in the memory and is 6 byte long. The reversed string should be stored in separate memory locations and should be displayed.

Ans:

#program that reverses a string
assume cs:code,ds:data
data segment
m1 db 0ah,0dh,"enter the string : $"
m2 db 0ah,0dh,"reverse of the string is: $"
s1 db 10h dup(?)
data ends
code segment
start:mov ax,data
mov ds,ax
lea dx,m1
mov ah,09h
int 21h
mov ch,01h
mov si,offset s1
back: mov ah,01h
int 21h
cmp al,0dh
jz exit
mov [si],al
inc si
inc ch
jmp back
exit: lea dx,m2
mov ah,09h
int 21h
cmp1:mov al,[si]
mov dl,al
mov ah,02h
int 21h
dec si
dec ch
jnz cmp1
mov ah,4ch
int 21h
code ends
end start

(b)     Write and run (using appropriate calling program) a near procedure in assembly language that converts an ASCII digit passed to it on AL register to equivalent binary value. The value is returned back on the AL register itself.

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(c)     Write and run an assembly language program that converts a packed two digit BCD number in AL register to equivalent binary number. The binary number is stored in the AH register.

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