From owner-freebsd-multimedia  Fri Aug  1 12:31:14 1997
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To: David Hogan <dhog@lore.plan9.cs.su.oz.au>
cc: multimedia@FreeBSD.ORG
Subject: Re: Bt848 question 
In-reply-to: Your message of "Fri, 01 Aug 1997 05:14:26 +1000."
             <199708010514.148197.out.bakij@plan9.cs.su.oz.au> 
Date: Fri, 01 Aug 1997 12:31:01 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
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Just mail to brooktree . The data book has their e-mail address. 
I don't think that 8bit is that useful. You can probably enable
the color bar to get a hint at what the card is doing and most
likely is using a fixed algorithm to dither down to 8bit. In fact,
thats probably the case given that it does no have any provision
for table lookup .

As for mailing to brooktree they are usually very friendly.

	Cheers,
	Amancio
>From The Desk Of David Hogan :
> Hi there!  I saw your page on the Bt848 driver for FreeBSD.  I
> am trying to write my own Bt848 support for the Plan 9 OS, and
> I've run into a problem caused by a deficiency in the documentation,
> and was wondering if you guys might know the answer, since you've
> worked with the card also.
> 
> I'm trying to use the 8-bit dithered RGB mode, but I have no idea
> what pallette the chip uses.  The PDF file from Brooktree is
> completely silent on this.  Presumably it's some kind of colour
> cube, but there are a lot of possible ways of representing one.
> Do you know what it is?  I suppose I could try asking Brooktree,
> but I thought I'd ask here first, since I've had better experiences
> talking to people who aren't companies...
> 
> You might be interested to know that the card which I have is a
> Miro PC TV, which your page says is not yet supported.  I'm still
> looking for technical information about the GPIO connections and
> the tuner module; the tuner appears to be similar to the Phillips
> Fl1236, but not identical -- at least, the control bits for the
> PLL (for selecting which range it is) don't match the specs I
> downloaded from Phillips.  I was also unable to find anything on
> the card which looked like an audio demodulator, so unless they
> are doing this with discrete components, it must be integrated with
> the tuner.  If I find out more, I'll let you know so that you can
> update your page...