Design of music box based on assembly language

Music box design based on assembly language （ You can switch songs halfway ）

The main function of this program is to play music , You can choose the song to play , You can switch music halfway , You can also quit playing music . The procedure is as follows ：

; Menu display 
DISPLAY  MACRO B     ; Define a macro instruction , That is, a piece of code that needs to be executed repeatedly , Or a set of instructions abbreviated to a macro 
		 LEA DX,B
		 MOV AH,9    ; call 9 Interrupt number , Display the menu on the screen 
		 INT 21H
		 ENDM
		 
DATA SEGMENT

MENU     DB 0DH,0AH,'1: <<liang zhi lao hu>>'  ; song 1： Two tigers 
		 DB 0DH,0AH,'2: <<xin nian hao>>'     ; song 2： Happy New Year 
		 DB 0DH,0AH,'3: <<fen shua jiang>>'   ; song 3:  whitewasher 
		 DB 0DH,0AH,'q: EXIT'                ; Quit playing music 
		 DB 0AH,0AH,'$'
		 
music1_fre DW 263,294,330,263  ; music 1 The frequency of 
		   DW 263,294,330,263
		   DW 330,349,392
		   DW 330,349,392
		   DW 392,440,392,349,330,263
		   DW 392,440,392,349,330,263
		   DW 263,196,263
		   DW 263,196,263,0
music1_time DW 10 dup(20), 40    ; music 1 The beat of the music 
			DW 2 dup(20), 40
			DW 4 dup(10), 20, 20
			DW 4 dup(10), 20, 20
			DW 2 dup(20), 40
			DW 2 dup(20), 40
			
music2_fre dw 262,262,262,196
           dw 330,330,330,262
           dw 262,330,392,392
           dw 349,330,294
           dw 294,330,349,349
           dw 330,294,330,262
           dw 262,330,294,196
           dw 247,294,262,0

music2_time dw 3 dup(12,12,25,25),12,12,50
            dw 3 dup(12,12,25,25),12,12,50

music3_fre	dw 392,330,392,330
		    dw 392,330,262
		    dw 294,349,330,294
		    dw 392
		    dw 392,330,392,330
		    dw 392,330,262
		    dw 294,349,330,294
		    dw 262
		    dw 294,294,349,349
		    dw 330,262,392
		    dw 294,349,330,294
		    dw 392
		    dw 392,330,392,330
		    dw 392,330,262
		    dw 294,349,330,294
		    dw 262
		    dw 0	
music3_time dw 3 dup(10h,10h,10h,10h,10h,10h,20h,10h,10h,10h,10h,40h)
		    dw 10h,10h,10h,10h,10h,10h,20h,10h,10h,10h,10h,20h
			
DATA ENDS

STACK SEGMENT

STACK ENDS			
			
CODE  SEGMENT                                                
    ASSUME DS:DATA,CS:CODE 
	
	
START:
      MOV AX,DATA
	  MOV DS,AX
	  
	  MOV AH,0
	  MOV AL,0
	  
INPUT:    ; The main program that controls music playback 
      DISPLAY MENU   ; Show menu 
	  
	  MOV AH,1
	  INT 21H    ; call 1 Interrupt number , Enter which music to play or quit playing 
	  
stop_music:
      CMP AL,'q'   ; If the input character is q, Then interrupt , Stop playing music 
	  JZ end_music
	  
	  
music1:      
      CMP AL,'1'
      JNZ music2  ; If the entered number is not 1, Jump to music 2 The subroutine of then judges 
      lea SI,music1_fre  ; The music 1 The offset address of the frequency is assigned to SI
      lea BP,music1_time  ; The music 1 The offset address of the beat is assigned to BP
      CALL play_music   ; Call the play music subroutine 
      JMP INPUT        ; The cycle continues to enter , Until you press ‘4’, That is, quit playing 

music2:      
      CMP AL,'2'
      JNZ music3  ; If the entered number is not 2, Jump to music 3 The subroutine of then judges 
      lea SI,music2_fre  ; The music 2 The offset address of the frequency is assigned to SI
      lea BP,music2_time  ; The music 2 The offset address of the beat is assigned to BP
      CALL play_music   ; Call the play music subroutine 
      JMP INPUT        ; The cycle continues to enter , Until you press ‘4’, That is, quit playing 

music3:      
      CMP AL,'3'
      JNZ INPUT  ; If the entered number is not 3, Jump to continue typing 
      lea SI,music3_fre  ; The music 2 The offset address of the frequency is assigned to SI
      lea BP,music3_time  ; The music 2 The offset address of the beat is assigned to BP
      CALL play_music   ; Call the play music subroutine 
      JMP INPUT        ; The cycle continues to enter , Until you press ‘4’, That is, quit playing 

end_music:                                                             
      MOV AH,4CH
      INT 21H

;*******************************************************************
sound proc near
        PUSH AX 
        PUSH BX 
        PUSH CX 
        PUSH DX 
        PUSH DI 
		;8253  Chip settings 
        MOV AL,0B6H  ;8253 initialization 
        OUT 43H,AL    ;43H yes 8253 The port address of the chip control port 
        MOV DX,12H    ; high 16 position 
        MOV AX,34dch   ; low 16 position                                         
        DIV DI    ; Calculate the frequency division value , Assign to ax.DI The frequency value of the sound stored in .
        OUT 42H,AL   ; Send low first 8 Bit to counter ,42h yes 8253 Chip channel 2 Port address of 
        MOV AL,AH 
        OUT 42H,AL   ; Evacuation height 8 Bit counter 
		
		; Set up 8255 chip ,  Control the loudspeaker on / Turn off 
        IN AL,61H    ; Read 8255 B Original value of port 
        MOV AH,AL     ; Save the original value 
        OR AL,3        ; Make two positions lower 1, Turn on the switch 
        OUT 61H,AL   ; Turn on the speaker ,  A voice 
		
WAIT1:    
        MOV CX,28000                                          
         
DELAY1:   
		nop
		loop DELAY1
        DEC BX 
        JNZ WAIT1 
        MOV AL,AH   ; Restore the original value of the speaker port 
        OUT 61H,AL 
        POP DI 
        POP DX 
        POP CX 
        POP BX                                                 
        POP AX 
        RET 


sound ENDP
;*************************************************************
play_music 	PROC NEAR   ; Play music subroutine 
       PUSH DS
	   SUB AX,AX
       PUSH AX

play_start:
		MOV AH,1
		INT 16H    ; Here is the key to switching music 
		JNZ INPUT
     MOV DI,[SI]  ; note 
	   CMP DI,0  ; Judge whether the note is 0, by 0 End playing music subroutine 
	   JE end_paly
	   MOV BX,[BP]   ; Rhythm 
	   CALL sound
	   
	   ADD SI,2
	   ADD BP,2
	   JMP play_start  ; Continue to execute the music playing subroutine , Until the end of a piece of music 
	   
end_paly:
       RET
       
       
	   
play_music endp
;*******************************************************************

CODE  ENDS 
END START   

After the program is executed , Press the number key 1 Play music 1, Press the number key 2 Play music 2, Press the number key 3 Play music 3, Press down ‘q’ Key to exit music playing . In the process of playing music, you can switch music or exit , such as , Press the number key 2 Play music 2, Press the number key during playback 1 Will stop playing music 2 Turn to music 1. Switch song implementation mainly uses int 16h interrupt , Here you can refer to a blogger's explanation of the interruption ：https://blog.csdn.net/qingkongyeyue/article/details/68490194?ops_request_misc=%7B%22request%5Fid%22%3A%22160579825619725222420556%22%2C%22scm%22%3A%2220140713.130102334.pc%5Fall.%22%7D&request_id=160579825619725222420556&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_v2~rank_v28-16-68490194.first_rank_ecpm_v3_pc_rank_v2&utm_term= assembly int+16 interrupt &spm=1018.2118.3001.4449