Date:	Thu, 13 Mar 1997 18:37:37 +0100 (MET)
From:	Jan Hubicka <hubicka AT ta DOT jcu DOT cz>
To:	djgpp AT delorie DOT com
Subject:	pcspaker driver
Message-ID:	<Pine.LNX.3.91.970313183233.17680D-100000@tabor.ta.jcu.cz>
MIME-Version:	1.0

Hi
i wrote pcspeaker driver for my demo(and mikmod of course) it works 
perfectly for me but has lots of problems at some other computers.
I they seems to be cause by other residents(for example at configuration 
w/o himem.sys everything works ok..)
what such handler need to do?
(I will sned code soon if needed)
I currently do: restoring of cs/ds, getting data from my array+playing, 
counter for bios->bios call/out 0x20,0x20 and poping ds..
and installing it using __dpmi_set_protected_mode_interrupt_handler(or 
something like that)
I missed something?
BTW how exactly out0x20,0x20 work. I know that it needs to be called 
before next interrupt happends. This should happend before bios handle is 
done..need I do out before calling bios too?
(I tested it/didn't helped much...)
btw another problem that happends is that sometimes after changing song
it plays garbage for short time but then it works ok..

Honza

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