77. BLOCK TRANSFER IN 8086

DATA SEGMENT
X DB 01H,02H,03H,04H,05H
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA 
MOV DS,AX
MOV CX,05H 
LEA SI,X+04 
LEA DI,X+04+03
UP: MOV BL,[SI] 
MOV [DI],BL 
DEC SI 
DEC DI
DEC CX 
JNZ UP
MOV AH,4CH
INT 21H
CODE ENDS
END START