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Date:      Mon, 18 Sep 2000 10:23:15 -0400
From:      "Andresen,Jason R." <jandrese@mitre.org>
To:        "Georg-W. Koltermann" <gwk@sgi.com>
Cc:        freebsd-multimedia@FreeBSD.ORG
Subject:   Re: SB16: recording 8 bit ok, 16 bit recording just gives noise
Message-ID:  <39C62553.B79294A7@mitre.org>
References:  <39C54B37.A229A4F@sgi.com>

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"Georg-W. Koltermann" wrote:
> 
> I am trying to record with my SoundBlaster16 ISA card.
> 
> Playing sounds and recording 8 bit sounds works ok.  If I try to record
> 16 bit sounds, I just get noise. Does anybody know this behaviour?
> 
> My kernel config is (FreeBSD 4.1-RELEASE):
> 
>      device          pcm
>      device          sbc0    at isa? port 0x220 irq 10 drq 1 flags 0x15
> 
> cat /dev/sndstat says:
> 
>      FreeBSD Audio Driver (newpcm) Sep  9 2000 00:45:09
>      Installed devices:
>      pcm0: <SB DSP 4.13> at io 0x220 irq 10 drq 1:5 (1p/1r channels duplex)
> 
> I am using the same configuration values (IO, IRQ, DMA) that Windoze
> uses.

These early ISA Soundblaster cards have a bug that prevents you from
playing and recording at 16 bits.  If you are playing a sound, you are
limited to recording at 8 bits.  (1 1/2 duplex card).  

-- 
   _  _    _  ___  ____  ___   ______________________________________
  / \/ \  | ||_ _||  _ \|___| | Jason Andresen -- jandrese@mitre.org
 / /\/\ \ | | | | | |/ /|_|_  | Views expressed may not reflect those 
/_/    \_\|_| |_| |_|\_\|___| | of the Mitre Corporation.


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