Z=|X-Y|

DATA SEGMENT
Z DB ?
DATA ENDS

CODE SEGMENT
ASSUME CS: CODE, DS: DATA
MAIN PROC FAR
START: PUSH DS
MOV AX, 0
PUSH AX
MOV AX, DATA
MOV DS, AX

MOV BH, 44H
MOV BL, 23H
CMP BH, BL
JGE LOOP
MOV CH, BH
MOV BH, BL
MOV BL, CH
LOOP: MOV AL, BH
SUB AL, BL
MOV Z, AL
RET
MAIN ENDP
CODE ENDS
END START

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