【正文】 OV DX,0000H DIV CX MOV [DI+2],DL MOV DX,0000H DIV CX MOV [DI+3],DL CALL CHANGE CALL DISP MOV BL, 00H RET；LP1: MOV CX,0004H ；數(shù)據(jù)移位保存子程序（前移四位） MOV SI,OFFSET VAR2 MOV DI,OFFSET VAR3LP2: MOV AL,[SI+3] MOV [SI+4],AL MOV AL,[DI+3] MOV [DI+4],AL DEC SI DEC DI LOOP LP2 RET；LP3: MOV CX,0004H ；保存上一次數(shù)據(jù)子程序 MOV SI,OFFSET VAR3 MOV DI,OFFSET VAR4LP4: MOV AL,[SI] MOV [DI],AL INC SI INC DI LOOP LP4 RET；.........................................................................CHANGE: MOV SI,OFFSET VAR2 MOV DI,OFFSET VAR4 MOV BX,OFFSET TABL MOV CX,0004HCOMP0: MOV AL,[DI] XLAT TABL MOV [SI],AL INC SI INC DI LOOP COMP0 RET；DISP: MOV SI,OFFSET VAR1 ；顯示子程序 MOV DI,OFFSET VAR2 MOV DL,[DI+3] CMP DL,3FH JNZ DIR3 MOV DL,[DI+2] CMP DL,3FH JNZ DIR2 MOV DL,[DI+1] CMP DL,3FH JNZ DIR1 JMP DIR0DIR3: MOV CX,0004H JMP DIRDIR2: MOV CX,0003H JMP DIRDIR1: MOV CX,0002H JMP DIRDIR0: MOV CX,0001HDIR: MOV AL,[SI] OUT 60H,AL MOV AL,[DI] OUT 61H,AL CALL TIME INC SI INC DI LOOP DIR RET；TIME: PUSH AX ；延時子程序 PUSH CX MOV CX,0002HTIME1: MOV AX,0300HTIME2: DEC AX JNZ TIME2 LOOP TIME1 POP CX POP AX RET；CLEAR: MOV SI,OFFSET VAR2 ；數(shù)據(jù)清零子程序 MOV DI,OFFSET VAR3 MOV CX,0005HCLEAR1: MOV AL,3FH MOV [SI],AL MOV AL,00H MOV [DI],AL INC SI INC DI LOOP CLEAR1 MOV BH,00H RET；STTK: CALL DISP ；放鍵測試程序 MOV AL,00H OUT 60H,AL IN AL,62H AND AL,60H CMP AL,60H JNZ STTK JMP STTCODE ENDS END START 二、心得與體會這次的課程設計主要針對鍵盤及可編程接口芯片8255A的編程，在上機調(diào)試過程中由于自己的疏忽及算法的不完善導致了程序不能實現(xiàn)預期的功能，經(jīng)過一遍又一遍的檢查和思考，終于完成了這次課程設計的任務。5A7FB3C0：STACK SEGMENT STACK DW 64 DUP (?)STACK ENDSDATA SEGMENTVAR1 DB 07H,0BH,0DH,0EHVAR2 DB 3FH,3FH,3FH,3FH,3FHVAR3 DB 00H,00H,00H,00H,00HTABL DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H DB 7FH,6FH,77H,7CH,39H,5EH,79H,71HDATA ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AX MOV AL,88H OUT 63H,AL ；8255A初始化STT: MOV AL,00H ；鍵盤測試 OUT 60H,ALNEXT: IN AL,62H AND AL,60H CMP AL,60H JNZ KEYABC CALL DISP