【正文】 DATA_8279為讀寫數(shù)據(jù)口的地址 OUT DX,AL RETWRITE_DATA ENDP。鍵值轉換KEY_NUM PROC NEAR AND AL,3FH 。無鍵按下，清CF JMP SCAN_KEY1SCAN_KEY ENDP。讀FIFO RAM，初始地址為000H MOV DX,DATA_8279 IN AL,DX STC 。讀狀態(tài)READ_FIFO: AND AL,7 JZ NO_KEY 。10000000B，寫顯示RAM，初始位為0000 JNZ WAIT1 。清除CLEAR PROC NEAR MOV DX,CMD_8279 MOV AL,0DEH 。從第一個數(shù)碼管開始移位顯示，寫顯示RAM命令 OUT DX,AL RETINIT8279_1 ENDP。8位字符顯示,左邊輸入,外部譯碼鍵掃描方式,雙鍵互鎖，10H右入口 OUT DX,AL CALL INIT8279_1 RETINIT8279 ENDPINIT8279_1 PROC NEAR CALL CLEAR 。CMD_8279為寫命令地址、讀狀地址 MOV AL,34H 。鍵掃描 JNC XIANSHI 。字型碼表 XLAT CALL WRITE_DATA MOV AL,00H JMP X8 X8: LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,05H JMP X8X4: MOV AL,05H AND AL,1FH LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,0H JMP X8X3: MOV AL,03H AND AL,1FH LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,05H JMP X8X2: MOV AL,02H AND AL,1FH LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,0 JMP X8X1: MOV AL,01H AND AL,1FH LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,05H JMP X8 XIAOSHU PROC NEAR PUSH AX PUSH BX PUSH CX PUSH DX CMP AL,0H JE X0 CMP AL,01H JE X1 CMP AL,02H JE X2 CMP AL,03H JE X3 CMP AL,04H JE X4 CMP AL,05H JE X5 CMP AL,06H JE X6 CMP AL,07H JE X7X0: MOV AL,0H LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,0 JMP X8X7: MOV AL,08H AND AL,1FH LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA MOV AL,05H JMP X8X6: MOV AL,07H AND AL,1FH LEA BX,LED_TAB 。處理小數(shù)部分 X5: MOV AL,06H LEA BX,LED_TAB 。字型碼表 XLAT CALL WRITE_DATA CALL INIT8279_1 MOV SUM,0 MOV KEYCOUNT,0 JMP START1 START_EXIT: JMP $ 。輸入的值大90的話，重新輸入 JG CHULI ADD SUM,AH JMP NO9 NO9: LEA BX,LED_TAB 。鍵值轉換為鍵號 CMP AL,09H 。帶小數(shù)點的字型碼表 XLAT CALL WRITE_DATA MOV AL,AH CALL XIAOSHU 。AL里保存整數(shù)部分 MOV AH,BH 。將小數(shù)的兩位取出 MOV BH,AL MOV AL,BL AND AL,11111000B 。計算部分 CMP AL,48H JNE NOTSHI MOV AL,09H LEA BX,LED_TBB 。沒有按鍵 XCHG AL,KEYCOUNT INC AL CMP AL,9 JNZ START2 MOV KEYCOUNT,0 CALL INIT8279_1 。主程序START1: CALL IfExit JZ START11 JMP ExitSTART11: CALL SCAN_KEY 。初始化子程序 MOV KEYCOUNT,0 MOV CX,0 。8279讀寫數(shù)據(jù)口的地址，由于偏移地址則CS接PCI卡的CS5!!! .CODESTART: MOV AX,DATA MOV DS,AX NOP CALL InitPCI CALL ModifyAddress 。帶小數(shù)點的整數(shù) DB 000H,10H,08H,03H,046H,021H,06H,0EHCMD_8279 DW 00B1H 。乘10的時候，保存AL所用的中間變量LED_TAB DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H 。中間變量 KEYCOUNT DB ? 。SUM DB 0H 。msg2 DB 39。msg1 DB 39。設備ID號 .STACK 100 .DATAIO_Bit8_BaseAddress DW ?msg0 DB 39。 32 BIT+RAM板卡上的8237提供基地址)Vendor_ID EQU 10EBH 。讀取該卡PCI9052基地址 JNC InitPCI4 LEA DX,msg2 JMP InitPCI1InitPCI4: AND CX,0FFFCH MOV IO_Bit8_BaseAddress,CX RETInitPCI ENDPModifyAddress PROC NEAR ADD CMD_8279,CX ADD DATA_8279,CX RETModifyAddress ENDP Exit: MOV AH,4CH INT 21H END START在實驗過程中，老師要求將四位評委改成八位評委，并且每位評委分數(shù)只占LED顯示的一位，程序如下：.MODEL TINYPCIBAR3 EQU 1CH 。清屏 MOV AH,0B1H MOV AL,01H INT 1AH CMP AH,0 JZ InitPCI2 LEA DX,msg0I