Re: video reset kills beep in DOS box

From: Gary Smith (bitbucket_at_example.com)
Date: 04/13/04 

Date: Mon, 12 Apr 2004 21:02:42 -0700

In microsoft.public.win2000.general nutso fasst <no.replies@no.where.net> wrote:
> My workstation runs Win2K. I wrote a DOS program that beeps the PC speaker
> by sending a BEL character (7) to the console. When I first open a DOS
> prompt and run the program, the speaker beeps. But if I run any programs
> that set the video mode--such as the DOS edit program, debug or an old
> game--the speaker no longer beeps. It doesn't matter if I beep the speaker
> with Int 21h function 2 or with Int 10h function 0Eh, the fact is that
> running most any old executable will kill sound from the speaker. To get the
> speaker sound back I have to open another DOS box.

Testing with the debug script you provided, I do not see the beep disabled
after running debug or edit.com. However, my system is not using the PC
speaker to generate the tone when I execute the program. It's using
Windows' default beep sound, which would be a .wav file. The sound
generated from the PC speaker in response to echoing a Ctrl-G character is
quite different. Nothing I do seems to disable that sound either. I
don't know whether this helps or just complicates the issue. 

-- 
Gary L. Smith                gls432@yahoo.com
Columbus, Ohio

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