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ORG 0100H
MOV A,30H ;取初值
CLR C
SUBB A,31H ;X-Y
JZ DZ1 ;X=Y?
JB OV,EB1 ;X-Y>0,OV=1,X<Y
AJMP DZ1 ;X-Y>0,OV=0,X>Y
JB OV,DZ1 ;X-Y<0,OV=1,X>Y
EB1:MOV A,31H ;X<Y
AJMP JS0
DZ1:MOV A,30H ;X>Y
JS0:MOV 32H,A
END