zj1.asm

一个在MASM环境下开发的键盘模拟钢琴按键的汇编程序,本程序由三个模块组成：八度音程的钢琴程序即 main 通用发声程序soundf,它能利用定时器发出指定频率的声音；还有就是IBM PC AT BI

dseg segment para 'data'
table dw 262
      dw 294
      dw 330
      dw 349
      dw 392
      dw 440
      dw 494
      dw 523
dseg ends

cseg segment para 'code'
        assume cs:cseg,ds:dseg
main proc far
start:
        mov ax,dseg
        mov ds,ax
new_note:
        mov ah,0
        int 16h
        cmp al,03h
        je exit
	cmp al,'0'
	je stop
	cmp al,0dh
	je stop
        mov bx,offset table
        cmp al,'1'
        jb new_note
        cmp al,'8'
        ja new_note
        and ax,0fh
        shl ax,1
        sub ax,2
        mov si,ax
        mov di,[bx][si]
        mov bx,10
        call soundf
        jmp new_note
exit:
        mov ax,4c00h
        int 21h
stop:
	mov al,0fdh
	out 61h,al
	jmp new_note
main endp


soundf proc near
        mov al,0b6h
        out 43,al
        mov dx,12h
        mov ax,348ch
        div di
        out 42h,al
        mov al,ah
        out 42h,al
        in al,61h
        mov ah,al
        or al,3
        out 61h,al
wait1:
        mov cx,33333
        call waitf
soundf endp

waitf proc near
        
  waitf1:
        in al,61h
        and al,10h
        cmp al,ah
        je waitf1
        mov ah,al
        loop waitf1
        
        ret
waitf endp

cseg ends
end start