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Date:      Tue, 01 May 2001 11:27:17 -0700
From:      Orion Hodson <hodson@aciri.org>
To:        Jason Andresen <jandrese@mitre.org>
Cc:        freebsd-multimedia@freebsd.org, George Uhl <uhl@rattler-f.gsfc.nasa.gov>
Subject:   Re: " Fwd: RAT problems with aureal vortex1 soundcard "
Message-ID:  <200105011827.f41IRHe32143@mule.aciri.org>
References:  <3AEEF94F.7594CEF3@mitre.org>

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Jason Andresen writes:
> I don't think any modern version of VAT support half-duplex
> communication.  Apparently the designers thought that everybody would be
> using full duplex sound cards by now.  Fortunatly VAT will completely
> refuse to start if you have a half duplex card or driver.

Jason

I think you are confusing RAT and VAT.  RAT only works with full
duplex cards - I made that (erroneous) design decision when RAT-4 work
started.  AFAIK VAT has always supported half-duplex cards
and half-duplex operation with full duplex cards.  Work on VAT stopped
around 95-96, so there are no "modern" versions, only maintenance has
gone on since then.

There was a problem with the freebsd-ports version of VAT misdetecting
full duplex cards as half-duplex, but it still worked
(http://www.FreeBSD.org/cgi/query-pr.cgi?pr=23618).  I shall re-check
the freebsd ports version tonight to be sure unless.

Cheers
- Orion

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