Write a program to store block of data in reverse order in a memory block using 8085 microprocessor?

Answer 1

A possible program to reverse a block of memory using the 8085...

PUSH F SAVE PROCESSOR STATE - OPTIONAL

PUSH B

PUSH D

PUSH H

LXI H,{address of block}

MOV D,H SAVE BLOCK ADDRESS

MOV E,H

MVI A,{size of block}

MOV C,A SAVE BLOCK SIZE

LOOP1:

MOV A,M GET DATA BYTE

PUSH F PUSH ON STACK

DCR C DECREMENT LOOP COUNT

XRA A TEST FOR END OF LOOP

CMP C

JNZ LOOP1

MOV H,D RESTORE BLOCK ADDRESS

MOV L,E

MOVE C,B RESTORE BLOCK SIZE

LOOP2:

POP F POP FROM STACK

MOV M,A PUT DATA BYTE

DCR C DECREMENT LOOP COUNT

XRA A TEST FOR END OF LOOP

CMP C

JNZ LOOP2

POP H RESTORE PROCESSOR STATE - OPTIONAL

POP D

POP B

POP F