【文章內容簡介】 cf db 1 geshu dw 30d cunshu db ? count1 dd 50h SECOND DB 0 MINUTE DB 0 HOUR DB 0 jianpantab dw 207h,203h,206h,202h,205h,201h,204h,200h dw 207h,203h,206h,202h,205h,201h,204h,200h TAB DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H 。0_9 的段碼 INITD PROC XSDM0 DB 0C0H,0BFH,0C0H,0C0H XSDM1 DB 0C0H,0C0H,0BFH,0C0H START: call init LP1: CALL JIANPAN JMP LP1 計算機硬件技術基礎課程設計 通訊設備人機接口設計（硬件實驗系統(tǒng)） 12 houbanduan proc pusha call laidian cmp cf,0 jz wt33 wt2: MOV DX,308H IN AL,DX AND AL,14H CMP AL,00H jz wt2 cli mov al,0ffh mov dx,addr1 out dx,al sti jmp wt22 jmp wt2 wt22: call delay2 call ltoff wt33: call init popa ret houbanduan endp init proc pusha mov al,1 mov cf,al mov dx,30ch mov al,99h out dx,al mov al,0ffh mov dx,300h out dx,al mov eax,80808080h mov dx,20ch out dx,eax mov eax,0ffffffffh mov dx,200h out dx,eax mov eax,0ffffffffh mov dx,204h 計算機硬件技術基礎課程設計 通訊設備人機接口設計（硬件實驗系統(tǒng)） 13 out dx,eax mov ax,30d mov geshu,ax mov al,0 mov hour,al mov second,al mov minute,al popa ret init endp zhanxian proc pusha mov dx,30ch mov al,89h out dx,al mov al,0bfh mov dx,300h out dx,al mov ecx,zhanxianc z1:mov dx,308h in al,dx and al,0ch cmp al,08h jz z3 。占線 cmp al,04h jz z4 。掛斷 loopd z1 mov dx,200h mov eax,0ff9291ffh out dx,eax mov dx,204h mov eax,0ffff86ffh out dx,eax call houbanduan jmp z5 z3: call zhanxiand jmp z5 z4: call ltoff z5: call init popa ret zhanxian endp 計算機硬件技術基礎課程設計 通訊設備人機接口設計（硬件實驗系統(tǒng)） 14 zhanxiand proc pusha mov ecx,zhanxianc1 zd:dec ecx cmp ecx,0 jz zdd mov dx,204h mov eax,0ff91c1ffh out dx,eax mov dx,200h mov eax,0ff9283ffh out dx,eax mov dx,308h in al,dx and al,0ch cmp al,08h jz zd 。 占線鍵高電平 cmp al,04h jz zd1 。己方掛斷 cmp al,0ch jz zd1 。占線鍵高，己方掛斷 cmp al,00h jz zd2 zdd:call autocut jmp zd1 zd2: mov dx,200h mov eax,0ff9291ffh out dx,eax mov dx,204h mov eax,0ffff86ffh out dx,eax call houbanduan zd1:call ltoff popa ret zhanxiand endp INIT459 PROC PUSHA mov dx,ctrl_8254 計算機硬件技術基礎課程設計 通訊設備人機接口設計（硬件實驗系統(tǒng)） 15 mov al,70h 。方式 0，定時中斷 out dx,al mov dx,cunt1 。通道 1 mov ax,47000 out dx,al mov al,ah out dx,al 。定時 1s，初始化完畢 mov dx,addr0 mov al,13h out dx,al mov dx,addr1 mov al,40h out dx,al mov dx,addr1 mov al,01h out dx,al mov dx,addr1 in al,dx and al,0feh out dx,al 。8259 初始化 cli mov