Can you give a 8085 program to reverse the memory block within the same block?

Answer 1

; push bytes on to stack

LXI H,start address

MVI C,number of bytes

LOOP1:

MOV A,M

PUSH PSW

DCR C

JNZ LOOP1

; pop bytes in reverse order off of stack

LXI H,start address

MVI C,number of bytes

LOOP2:

POP PSW

MOV M,A

DCR C

JNZ LOOP2

Alternate Answer: (Not using the stack)

LXI B, start address

LXI D, end address

LOOP1:

LDAX B get first byte

MOV H,A save it

LDAX D get last byte

STAX B store in first byte position

MOV A,H retrieve last byte

STAX D store in last byte position

INX B increment first byte address

DCX D decrement last byte address

MOV A,B loop until addresses cross

CMP D

JNC LOOP1

MOV A,C

CMP E

JNC LOOP1