STACK SEGMENT STACK
DW 64 DUP(?)
STACK ENDS
CODE SEGMENT
ASSUME CS:CODE
START:PUSH DS
MOV AX,0000H
MOV DS,AX
MOV AX,OFFSET IRQ0
MOV SI,0020H
MOV [SI],AX
MOV AX,CS
MOV SI,0022H
MOV [SI],AX
POP DS
MOV AL,0FCH
OUT 21H,AL
MOV AL,15H
OUT 43H,AL
MOV AL,0FFH
OUT 40H,AL
MOV DL,30H
A1: STI
JMP A1
IRQ0: MOV AH,01H
MOV AL,DL
CMP AL,3AH
JNZ A2
MOV AL,0DH
INT 10H
MOV AL,30H
A2: INT 10H
INC AX
MOV DL,AL
MOV AX,0120H
INT 10H
CALL DALLY
MOV AL,20H
OUT 20H,AL
IRET
DALLY:PUSH AX
MOV CX,0100H
A3: MOV AX,0560H
A4: DEC AX
JNZ A4
LOOP A3
POP AX
RET
CODE ENDS
END START
将其修改为利用8253的0＃通道来定时中断（IRQ0），循环显示"4 3 2 1 Z Y X W V U"（注意定时中断~）满意再加100分！！
是8253的,不会就不会~不要胡乱复制个程序来回答~
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