From alsa-devel-owner@alsa.jcu.cz  Fri Sep 18 14:30:37 1998
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Date: Fri, 18 Sep 1998 14:29:02 +0200 (MET DST)
From: Jaroslav Kysela <perex@jcu.cz>
To: Ulf Axelsson <Ulf.Axelsson@ore.ims.se>
cc: alsa-devel@alsa.jcu.cz
Subject: Re: ESS1878 driver
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On Fri, 18 Sep 1998, Ulf Axelsson wrote:

> Hi!
> 
> Some questions:
> 
> Perhaps there should be a common driver for ESS1868/69/78/79 that
> handles the probably (looks like that in the docs) minor differences
> between the cards?

Yes, that right.. Unfortunately I don't have free time to code driver for
these chips now.. Do you write one?

> The docs say that you almost definitely have to use PNP to configure
> the card (can be done manually but then you have to allocate unused
> ports etc yourself). But when using it in ESS1688 compatibility mode
> I need no PNP-initialization ?? (I boot linux through DOS but do
> no initialization of sound there)

Newer chips are probably backward compatible and provides compatibility
with old ES1688...

> The card obviously can record and play 16bit 44Khz stereo sound. I
> tested under WinNT and it appeared to work. CD^3 uses ESS1868 and they
> claim they can do 16bit 44Khz stereo sound. Why does the docs say
> that 16bit 22Khz stereo is the maximum programmable output rate?
> (Or am I misreading the docs?)

Which docs? I have datasheet for ES1868 and here is rate range from 4kHz
to 48kHz... The limitation is for full duplex - it can be only mono
(not very good, but useable for network phone applications)..

						Jaroslav

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



