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MOV AL, 00H
L1:
OUT 80H,AL
CALL DELAY
INC AL
CMP AL, 0FFH //输出上升波形,00-ff
JNE L1
L2:
OUT 80H,AL
CALL DELAY
DEC AL
CMP AL,0 //输出下降波形,ff-00
JNE L2
JMP L1
DELAY:PROC NEAR PTR
MOV BP,0FFH
X1:DEC BP
JNZ X1
RET
DELAY ENDP