Question

Write a program that defines 100 bytes in DATA SEGMENT with Label LIST_A and 50 bytes in EXTRA SEGMENT with Label LIST_B. The Program Code Receives 50BCD Number At DATA Port in unpacked Form and save At Even memory Address of LIST_A and Store 0 at Odd memory locations ,After Successful saving copy only saved BCD Number from LIST_A to LIST_B

Answer 1

I think i can help you.
This ASM program starts from here:
;Define Part
DATA SEGMENT
LIST_A DB 100 DUP(?)
DATA ENDS
EXTRA SEGMENT
LIST_B DB 50 DUP(?)
EXTRA ENDS
;I assume that CPU and I/O Interface are in unconditional transfer mode
;Receiving Part
MOV AX,DATA
MOV DS,AX
MOV CX,50
LEA SI,LIST_A
LOP: IN AL,DATA ; DATA is a port
MOV [SI],AL
INC SI
MOV AL,0H
MOV [SI],AL
INC SI
LOOP LOP
;Copy BCD from A to B
MOV CX,50
LEA SI,LIST_A
LEA DI,LIST_B
LOP2: MOVS BYTE PTR [DI],BYTE PTR [SI]
INC SI
INC SI
INC DI
LOOP LOP2

Answer 2

Please post this question in the Computer Science group. Thank you.
Link to the Computer Science group:
http://openstudy.com/study#/groups/Computer%20Science