Date: Fri, 01 Aug 1997 12:31:01 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: David Hogan <dhog@lore.plan9.cs.su.oz.au> Cc: multimedia@FreeBSD.ORG Subject: Re: Bt848 question Message-ID: <199708011931.MAA05683@rah.star-gate.com> In-Reply-To: Your message of "Fri, 01 Aug 1997 05:14:26 %2B1000." <199708010514.148197.out.bakij@plan9.cs.su.oz.au>
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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...
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