From alsa-user-owner@alsa.jcu.cz  Tue May 26 16:54:18 1998
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	Tue, 26 May 1998 16:53:48 +0200
Date: Tue, 26 May 1998 16:53:48 +0200 (MET DST)
From: Jaroslav Kysela <perex@jcu.cz>
To: Stephen Oxley <so101@york.ac.uk>
cc: alsa-user@alsa.jcu.cz
Subject: Re: Better SB16 ViBRA16X PnP support?
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On Wed, 20 May 1998, Stephen Oxley wrote:

> Hi, I've had nothing but trouble with this card, I hope someone can help.
> 
> 1. I have been able to play sound and record sound but not both at the
> same time. - half duplex -
> 
> 2. The sound quality isn't as good as when using oss-linux (module driver) 
> or oss-free (compiled into kernel, but in module form), hiss in the
> background -not as clear reproduction of sound-, which makes me think I
> only have 8 bit sound available under alsa. 

I looked to oss-free, but there isn't specific initialization for SB 16
Vibra soundcards (except MIDI UART).. Can you write me your setup ('cat
/proc/dma' and 'cat /proc/interrupts') for OSS-free?

> I believe the problem to be that this sound card doesn't have a 16bit dma
> channel but two 8bit dma channels (perhaps only one!, although I did read
> somewhere that it is supposed to be able to do hardware full duplex and
> this is achieved nicely under windows), instead of the usual sound blaster
> one 16bit and one 8bit configuration.
> 
> Both of these 8bit channels can be allocated to dma 0,1 or 3 and that is
> where the configuration problems start. Alsa can only recognise one of
> these channels and presumably thinks that it can only play 8bit sound
> through it. 

Yes, it's true.. I'm sorry, but I don't have any SB16 Vibra specific
documentation, so any help is needed!!! Aren't this soundcard backwards
compatible, so second 16-bit DMA channel should be used without problems?

						Jaroslav

-----
Jaroslav Kysela <perex@jcu.cz>
Academic Computer Centre, University of South Bohemia
Branisovska 31, C. Budejovice, CZ-370 05 Czech Republic


