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CODE
SEGMENT
ASSUME CS:CODE,DS:CODE,ES:CODE
ORG 3400H
H8:
JMP P8259
PORT0
EQU 0FFE0H
PORT1
EQU 0FFE1H
;-------------------åå§å-------------------
P8259: CLI
MOV AX,OFFSET INT8259
MOV BX,003CH
MOV [BX],AX
MOV BX,003EH
MOV AX,0000H
MOV [BX],AX
CALL FOR8259
MOV SI,0000H
I8255: MOV DX,0FFDBH
MOV AL,8AH
OUT DX,AL
MOV BL,03
P8253: MOV DX,0FFD9H
;
IN AL,DX
ï¼éæ©3ç§è½¬é
TEST AL,01H
JNZ QQQ
TEST AL,02H
JNZ WWW
MOV DX,0FFEBH
ï¼è½¬é0
MOV AL,34H
OUT DX,AL
MOV DX,0FFE8H
MOV AL,00H
OUT DX,AL
MOV AL,096H
OUT DX,AL
JMP OVER1
QQQ:
MOV DX,0FFEBH
ï¼è½¬é1
MOV AL,34H
OUT DX,AL
MOV DX,0FFE8H
MOV AL,00H
OUT DX,AL
MOV AL,010H
OUT DX,AL
JMP OVER1
WWW:
MOV DX,0FFEBH
ï¼è½¬é2
MOV AL,34H
OUT DX,AL
MOV DX,0FFE8H
MOV AL,00H
OUT DX,AL
MOV AL,0F0H
OUT DX,AL
OVER1:
STI
;ä¸æåç¨åº------------------------------------
INT8259:CLI
MOV DX,0FFD8H
MOV SI,0FFD9H//éè¿PB7æ§å¶æ£å转
IN AL,SI
AND AL,80H
JZ X59
XX59:
MOV AL,BL
OUT DX,AL
SHL BL,1
CMP BL,18H
JZ A1
CMP BL,12H
JNZ C1
MOV BL,03H
JMP C1
A1:
MOV BL,09H
C1:
MOV AL,20H
MOV DX,PORT0
OUT DX,AL
STI
IRET
X59:
MOV AL,BL
OUT DX,AL
SHR BL,1
CMP BL,81H
JZ A2
CMP BL,88H
JNZ C2
MOV BL,0CH
JMP C2
A2:
MOV BL,09H
C2:
MOV AL,20H
MOV DX,PORT0
OUT DX,AL
STI
IRET
;8259Aåå§å==============================
FOR8259:MOV AL,13H
MOV DX,PORT0
OUT DX,AL
MOV AL,08H
MOV DX,PORT1
OUT DX,AL
MOV AL,09H
OUT DX,AL
MOV AL,7FH
;IRQ7
OUT DX,AL
RET
CODE
ENDS
END H8
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