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发信人: benky (梦的记忆), 信区: DOS
标 题: 请教用PC喇叭发声问题 (转载)
发信站: BBS 水木清华站 (Sun May 28 23:40:53 2000)

【 以下文字转载自 Programming 讨论区 】
【 原文由 benky 所发表 】
各位大虾，我在用汇编写一段用PC发声系统演奏一段乐曲，编译通过，也能运行?
但就是发不出声音来。请各位帮帮忙看一下。谢谢。
文章太长，请斑竹保留几天，我会自己删的。谢谢

；*******************************
TITLE GENSOUND--THE SPEAKER BEEPER
;PRODUCES A TONE OF A SPECIFIED FREQUENCY
; AND DRUATION PUBLIC GENSOUND
public gensound
cseg segment para 'code'
assume cs:cseg
gensound proc far
push ax
push bx
push cx
push dx
push di
mov al,0b6h
out 43h,al
mov dx,12h
mov ax,533h*896
div di
out 42h,al
in al,61h
mov ah,al
or al,3
waitl: mov cx,2801
delay: loop delay
dec bx
jnz waitl
mov al,ah
out 61h,al
pop di
pop dx
pop cx
pop bx
pop ax
ret
gensound endp
cseg ends
end
；********************************************

；**********************************************
TITLE MUSIC--A MUSIC OF 'MARY HAD A LITTLE LAMB'
extrn gensound:far
stack segment para stack'stack'
db 64 dup('stack....'
stack ends
;---------------------------
dseg segment para 'data'
mus_freq dw 330,294,262,294,3 dup(330)
dw 3 dup(294),330,392,392
dw 330,294,296,294,4 dup(330)
dw 29,294,330,294,262,-1
mus_time dw 6 dup(25),50
dw 2 dup(25,25,50)
dw 12 dup(25),100
dseg ends
;-----------------------------
cseg segment para 'code'
assume cs:cseg,ss:stack,ds:dseg
music proc far
start: push ds
sub ax,ax
push ax

mov ax,dseg
mov ds,ax
mov ax,stack
mov ss,ax

lea si,mus_freq
lea di,ds:mus_time

freq_mus:
mov di,
cmp di,-1
je exit
mov bx,ds:
call gensound
add si,2
add bp,2
jmp freq_mus
exit: ret
music endp
cseg ends
end start

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※ 来源:·BBS 水木清华站 smth.org·

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