STRING COMPARE

ASSUME CS:CODE,DS:DATA,ES:EXTRA
CODE SEGMENT
MOV AX,DATA
MOV DS,AX
MOV AX,EXTRA
MOV ES,AX
MOV AX,0AAAAH
MOV SI,OFFSET STR1
MOV DI,OFFSET STR2
MOV CL,LOS
CLD
ITER:
        CMPSB
        JNE EXIT_LOOP
LOOP ITER
MOV AX,0FFFFH
HLT
EXIT_LOOP:
        MOV AX,0000H
        HLT
CODE ENDS
DATA SEGMENT
STR1 DB 'MASM'
LOS DB 04H ; LARGEST OF BOTH STRINGS
DATA ENDS
EXTRA SEGMENT
STR2 DB 'MASM'
EXTRA ENDS
END