硬件实验八 8259单级中断控制器实验.doc

;-硬件实验八 8259单级中断控制器实验-CODE SEGMENT ASSUME CS:CODE,DS:CODE,ES:CODE ORG 3400HH8: JMP P8259ZXK EQU 0FFDCHZWK EQU 0FFDDHLED DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H DB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,0DEH,0F3HBUF DB ?,?,?,?,?,?Port0 EQU 0FFE0HPort1 EQU 0FFE1HP8259: CLI CALL WP ;初始化显示“P.” MOV AX,OFFSET INT8259 MOV BX,003CH MOV BX,AX MOV BX,003EH MOV AX,0000H MOV BX,AX CALL FOR8259 mov si,0000h STICON8: CALL DIS JMP CON8;-INT8259:cli MOV BX,OFFSET BUF MOV BYTE PTR BX+SI,07H INC SI CMP SI,0007H JZ X59XX59: MOV AL,20H MOV DX,Port0 OUT DX,AL mov cx,0050hxxx59: push cx call dis pop cx loop xxx59 pop cx mov cx,3438h push cx STI IRETX59: MOV SI,0000H CALL WP JMP XX59;=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;-WP: MOV BUF,11H ;初始化显示“P.” MOV BUF+1,10H MOV BUF+2,10H MOV BUF+3,10H MOV BUF+4,10H MOV BUF+5,10H RET;-DIS: MOV CL,20H MOV BX,OFFSET BUFDIS1: MOV AL,BX PUSH BX MOV BX,OFFSET LED XLAT POP BX MOV DX,ZXK OUT DX,AL MOV AL,CL MOV DX,ZWK OUT DX,AL PUSH CX MOV CX,0100HDELAY: LOOP $ POP CX CMP CL,01H JZ EXIT INC BX SHR CL,1 JMP DIS1EXIT: MOV AL,00H MOV DX,ZWK OUT DX,AL RET;-CODE ENDS END H8;-硬件实验二 8255A并行口实验(2) PA输入,PB输出-CODE SEGMENT ASSUME CS:CODE,DS:CODE,ES:CODE ORG 32E0HPA EQU 0FFD8HPB EQU 0FFD9HPC EQU 0FFDAHPCTL EQU 0FFDBHH2: MOV DX,PCTL MOV AL,90H