哎嘿嘿

CODE SEGMENT
ASSUME CS:CODE
START: MOV DX, 287H
MOV AL, 00010000B 只写低位
OUT DX, AL
MOV DX, 280H
MOV AL, FH 低位0FH
OUT DX, AL
LP1: MOV AH, 0BH 是否有键按下
INT 21H
CMP AL, 0FFH
JZ ED
NOP 不确定是否需要锁存
IN 280H, AL
ADD AL, 30H ；待验证
MOV DL, AL
INT AH, 02H
INT 21H
JMP LP1
ED: MOV AH, 4CH
INT 21H
CODE ENDS
END START
CODE SEGMENT
ASSUME CS: CODE
START: MOV DX, 283H
MOV AL, 00110111B
OUT DX, AL
MOV DX, 280H
MOV AL, 0
OUT DX, AL
MOV AL, 10H
OUT DX, AL
MOV DX, 281H
MOV AL, 0
OUT DX, AL
MOV AL, 10H
OUT DX AL
LP1:NOP
MOV AH, 0BH 是否有键按下
INT 21H
CMP AL, 0FFH
JZ ED
JN LP1
ED: MOV AH, 4CH
INT 21H
CODE ENDS
END START
3：
CODE SEGMENT
ASSUME CS: CODE
START:
MOV AL,10010010B
OUT 28BH,AL
LP1：IN AL,28AH
OUT 288H,AL
MOV AH, 0BH 是否有键按下
INT 21H
CMP AL, 0FFH
JZ ED
JN LP1
ED: MOV AH, 4CH
INT 21H
CODE ENDS
END START
4：
CODE SEGMENT
ASSUME CS: CODE
START: MOV AL,10010010B
OUT 28BH,AL
MOV AL,03H
LP1：OUT 288H,AL
ROL AL,1
ROL AL,1
NOP
NOP
NOP
IN AL,28AH
ROR AL,1
ROL AL,1
JC ED
JMP LP1
ED: MOV AH, 4CH
INT 21H
CODE ENDS
END START

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ioport equ0d400h-0280h<?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office"></?xml:namespace>
io<?xml:namespace prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags">8255a equ ioport+288h</?xml:namespace>
io8255b equioport+28bh
io8255c equ ioport+28ah
code segment
assume cs:code
start: mov dx,io8255b ;设8255为C口输入,A口输出
mov al,8bh
out dx,al