From alsa-user-owner@alsa.jcu.cz  Wed Sep 16 14:12:24 1998
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Message-ID: <19980916120049.B363@luedi.oche.de>
Date: Wed, 16 Sep 1998 12:00:49 +0200
From: Dirk Luetjens <dirk@luedi.oche.de>
To: alsa-user@alsa.jcu.cz
Subject: Re: audiodrive1868, mup-401
References: <86btoot4bn.fsf@hobbes.wg.net> <Pine.LNX.3.96.980914011136.28720M-100000@entry.jcu.cz>
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In-Reply-To: <Pine.LNX.3.96.980914011136.28720M-100000@entry.jcu.cz>; from Jaroslav Kysela on Mon, Sep 14, 1998 at 12:30:48PM +0200
Reply-To: alsa-user@alsa.jcu.cz
Sender: alsa-user-owner@alsa.jcu.cz
Precedence: list

Hi,

On Mon, Sep 14, 1998 at 12:30:48PM +0200, Jaroslav Kysela wrote:

> > I have a simple and cheap audiodrive ESS1868 card that works fine with 
> > the snd-audiodrive1688 module. Except that I dont know how to play
> > midi files. Since I installed a PS/2 mouse to my computer I get the
> > follwing message while installing the alsa modules:
> > 
> > snd: warning: can't allocate IRQ for MPU401, midi port is disabled
> 
> Most of your described problems (IRQ list etc..) is caused that ESS1688
> chip for which is driver written doesn't support some features which
> ESS1868 chip have. I also don't know if ESS1688 chip can share interrupts
> with CODEC part, thus two different interrupts (one for codec and one
> for MPU-401 is required).
> 
> Good news - I have datasheets for ESS1868/ESS1869/ESS1878/ESS1879 chips,
> so support for these duplex chips will be added soon...

I will be one of your beta-tester :-) I would like to offer you some
help, but I'm definitifly no expert in sound.

Windows shows me that there is although some control interface at
address 0x800-0x807. Also I find this interface with pnpdump. I
dont know for which purpose it serves. Perhaps this can although be
used within your driver.

> > - Sorry, but what is the difference between the FM and PCM device, and 
> >   how does the ALSA implementation of the pcm device differ to OSS,
> >   that one need an extra module?
> 
> FM - Frequency Modulation (analog oscilators)
> PCM - Pulse Code Modulation (digital data)

Oh, yes. Naturally. First think, then ask :-)
 
Good work
Dirk

