SEGMENT MOV AL, XX DB OFOH CMP AL, 0 DB JGE BIGR DATA ENDS MOV AL, OFFH CODE SEGMENT MOV YY, AL ASSUME CODE, DS: DATA RET START PROC FAR BIGR: JE EQUL PUSH DS MOV AL, 1 SUB AX, AX EQUL: MOV YY, AL PUSH AX RET MOV AX, DATA START ENDP MOV DS, AX CODE ENDS END STARTTA SEGMENT XX DB 0F0H YY DB ? DATA ENDS CODE SEGMENT ASSUME CS：CODE，DS：DATA START PROC FAR PUSH DS SUB AX，AX PUSH AX MOV AX，DATA MOV DS，AX MOV AL，XX CMP AL，0 JGE BIGR MOV AL，0FFH MOV YY，AL RET BIGR： JE EQUL MOV AL，1 EQUL： MOV YY，AL RET START ENDP CODE ENDS END START