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Date:      Fri, 18 Jul 1997 18:20:22 +0200 (MET DST)
From:      Luigi Rizzo <luigi@labinfo.iet.unipi.it>
To:        hasty@rah.star-gate.com (Amancio Hasty)
Cc:        multimedia@FreeBSD.ORG
Subject:   Re: sound and dma ...
Message-ID:  <199707181620.SAA17901@labinfo.iet.unipi.it>
In-Reply-To: <199707181630.JAA05399@rah.star-gate.com> from "Amancio Hasty" at Jul 18, 97 09:30:38 am

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> No problem;specially, since , the dma subsystem is so complex for
> just playing audio --- I think is amazing . Hopefully, with PCI
> things will get better because the complex buffering scheme is
> really about reducing latency to the sound card.

yes except all sound card I can find are ISA units...

But this discussion on the double buffering problem has made me finally
remember that I forgot to implement such a scheme in the "asc" driver
(for scanner) and this is probably the reason why, in color mode, I
occasionally lose samples :(

Latest snap of the sound code (with sndstat working and initial
support for multiple boards of the same type) at

	http://www.iet.unipi.it/~luigi/snd970718.tgz

this includes a critical fix to "pnp.c" which was the reason why my
card had a tendency to hang during the probe...

I have a test machine with 1 PnP device (CS4232) and an old sound
galaxy which probes as SoundBlaster 2.1:

    rizzo# cat /dev/sndstat
    FreeBSD Sound Driver Jul 18 1997
    Installed drivers:
    pcm0: <SoundBlaster 2.1> at 0x0240 irq 7 dma 1:0
    pcm1: <SoundBlaster Pro 3.2> at 0x0220 irq 7 dma 1:0
    rizzo#


	Cheers
	Luigi



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