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SubjectDocumentation for Pro Audio Spectrum?
Date
On Friday 02 August 2002 03:08, Dave Jones wrote:

>>>> Are there any OSS drivers for any particular cards for which we
>>>> don't have an equivalent ALSA driver ?
>>>
>>> At least the Media Vision Pro Audio Spectrum 16 (PAS). An old and
>>> rather quirky ISA card, but one that does have particularly decent
>>> audio quality; much better then the usual ISA soundblaster[-clones]
>>> anyways. As such, some people might grumble a bit if Linux support for
>>> it was completely dropped.
>>>
>>> The ALSA project seems rather set on "no documentation == no driver"
>>> and seeing as how Media Vision (and its successor company, the name of
>>> which I have now forgotten; it was bought out by creative labs) is out
>>> of business and how I've never seen a PAS datasheet "out in the wild"
>>> getting ALSA support for this and perhaps other such older hardware
>>> could prove troublesome still ...
>>
>> Bring this up on the kernel list.
>> *someone* must still have documentation for this beast.

My own PAS16 sports the following chips (may have misidentified their
function):

MV Spectrum MVD101D - Multimedia controller (native interface)
MV Spectrum MVA416 - PCM
MV Spectrum MVA508 - Mixer
MV Thunder MVD201A - SB Pro compatible part

and a 28MHz oscilator (which is I believe relevant since not all PASs use the
same clock or something)

Note: the PAS16 is not SB Pro compatible, it just /has/ an SB Pro compatible
part; with the current OSS drivers you get /dev/{audio,dsp,mixer}{0,1} with 0
being the native PAS16 stuff and, unless you disable it, 1 the SBP stuff

The card's quirky in that it doesn't seem to (directly, natively) support a
44100 sampling rate; I had to resample to a supported rate to get it to
produce something audible under Linux. The Windows driver seems to compensate
for that automagically (and has that "28MHz clock source" as a driver
option). Simply catting an .au to /dev/audio0 does let Linus pronounce Linux
(in both Swedish and English) though.

Rene.
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