1、;-硬件实验八 8259 单级中断控制器实验-CODE SEGMENTASSUME CS:CODE,DS:CODE,ES:CODEORG 3400HH8: JMP P8259ZXK EQU 0FFDCHZWK EQU 0FFDDHLED DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90HDB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,0DEH,0F3HBUF DB ?,?,?,?,?,?Port0 EQU 0FFE0HPort1 EQU 0FFE1HP8259: CLICALL WP ;初始化显示“P.”MOV AX,OF
2、FSET INT8259MOV BX,003CHMOV BX,AXMOV BX,003EHMOV AX,0000HMOV BX,AXCALL FOR8259mov si,0000hSTICON8: CALL DISJMP CON8;-INT8259:cliMOV BX,OFFSET BUFMOV BYTE PTR BX+SI,07HINC SICMP SI,0007HJZ X59XX59: MOV AL,20HMOV DX,Port0OUT DX,ALmov cx,0050hxxx59: push cxcall dispop cxloop xxx59pop cxmov cx,3438hpush
3、 cxSTIIRETX59: MOV SI,0000HCALL WPJMP XX59;=FOR8259:MOV AL,13HMOV DX,Port0OUT DX,ALMOV AL,08HMOV DX,Port1OUT DX,ALMOV AL,09HOUT DX,ALMOV AL,7FH ;IRQ7OUT DX,ALRET;-WP: MOV BUF,11H ;初始化显示“P.”MOV BUF+1,10HMOV BUF+2,10HMOV BUF+3,10HMOV BUF+4,10HMOV BUF+5,10HRET;-DIS: MOV CL,20HMOV BX,OFFSET BUFDIS1: MOV
4、 AL,BXPUSH BXMOV BX,OFFSET LEDXLATPOP BXMOV DX,ZXKOUT DX,ALMOV AL,CLMOV DX,ZWKOUT DX,ALPUSH CXMOV CX,0100HDELAY: LOOP $POP CXCMP CL,01HJZ EXITINC BXSHR CL,1JMP DIS1EXIT: MOV AL,00HMOV DX,ZWKOUT DX,ALRET;-CODE ENDSEND H8;-硬件实验二 8255A 并行口实验(2) PA 输入,PB 输出-CODE SEGMENTASSUME CS:CODE,DS:CODE,ES:CODEORG 32E0HPA EQU 0FFD8HPB EQU 0FFD9HPC EQU 0FFDAHPCTL EQU 0FFDBHH2: MOV DX,PCTLMOV AL,90HOUT DX,ALP2: MOV DX,PAIN AL,DXINC DXOUT DX,ALJMP P2CODE ENDSEND H2
