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微機原理與接口技術課程設計--簡易電子琴設計(編輯修改稿)

2025-07-03 19:29 本頁面
 

【文章內容簡介】 E1 。發(fā)音1    CALL FY  CALL DELAY  JMP A0    F2: MOV BX, OFFSET TABLE1 。發(fā)音2  INC BX    CALL FY    CALL DELAY  JMP A0  F3: MOV BX, OFFSET TABLE1 。發(fā)音3  ADD BX,2  CALL FY   CALL DELAY   JMP A0   F4: MOV BX, OFFSET TABLE1 。發(fā)音4  ADD BX,3  CALL FY    CALL DELAY   JMP A0    F5: MOV BX, OFFSET TABLE1 。發(fā)音5    ADD BX,4   CALL FY    CALL DELAY  JMP A0  F6: MOV BX, OFFSET TABLE1 。發(fā)音6   ADD BX,5    CALL FY   CALL DELAY   JMP A0    F7: MOV BX, OFFSET TABLE1 。發(fā)音7   ADD BX,6  CALL FY  CALL DELAY    JMP A0  FY PROC 。發(fā)音子程序    A7: MOV AL, 0B6H 。8253初始化    OUT 43H, AL  MOV AL, [BX]  MOV AH, 00H    MOV DL, 25H   MUL DL   OUT 42H, AL   MOV AL, AH  OUT 42H, AL    RET  FY ENDP   DELAY PROC 。延時子程序    PUSH CX   PUSH AX   MOV CX,0040H  A5: MOV AX,056CH   A6: DEC AX    JNZ A6    LOOP A5  POP AX   POP CX  MOV AL,0BAH 。改變8253的控制字1011 1010,工作于方式5  MOV DX,43H  OUT DX,AL  RET DELAY ENDP  CODE ENDS    END START     自動播放預存琴譜功能程序設計   DATA SEGMENT  TABLE2 DB 4DH,4DH,33H,33H,2DH,2DH,33H,01H    DB 39H,39H,3DH,3DH,45H,45H,4DH,01H  DB 33H,33H,39H,39H,3DH,3DH,45H,01H  DB 33H,33H,39H,39H,3DH,3DH,45H,01H  DATA ENDS   STACK SEGMENT STACK    DW 64 DUP(?)    STACK ENDS   CODE SEGMENT    ASSUME CS:CODE,DS:STACK START: MOV AX, DATA  MOV DS, AX   MOV AL,82H 。8255初始化   OUT 63H,AL  CMP AL,01H 。擴展功能   JZ F0    F0: MOV BX, OFFSET TABLE2  JZ A1  A1: IN AL,61H   CMP AL,01H    JNZ A4  CALL FY
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