Date: Wed, 12 Feb 1997 12:32:46 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Thomas Roell <roell@crab.xinside.com> Cc: Randall Hopper <rhh@ct.picker.com>, multimedia@freebsd.org Subject: Re: Bt848 driver & Wincast -- some success Message-ID: <199702122032.MAA04776@rah.star-gate.com> In-Reply-To: Your message of "Wed, 12 Feb 1997 08:06:51 MST." <199702121506.IAA08268@xeno.xinside.com>
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Mmmm.. I am still waiting on for a list of cards which I can install on my system for dual display -- PCI cards. BTW: I know about the advantage of YUY2 vs RGB to save bandwith however I don't have YUY2 support on XFree86 -- I could implement but will see. Cheers, Amancio >From The Desk Of Thomas Roell : > In your message of 11 February 1997 you write: > > > Hi, > > > > You need the B848 Databook from Brooktree if you want to hack on the > > driver, period. > > > > What is your CPU and motherboard chipset, example Natoma or Triton... > > > > If you have a Mercury chipset, then you don't have enough PCI bandwith > > to drive a 640x480 32bits picture. Also try playing with the PCI parameters > > in your BIOS. Your PCI clock rate should be around 32 or so and not 60 or > > higher. > > > > You can try 320x240 with something like 15bits or 8bits color depth. > > > > The ghostimage that you are experiencing in your system is an indication > > that your PCI chipset is not able to keep up with the Bt848. > > > > The driver does not have the ioctls to transfer video to memory and > > is not hard to add . I can provide this feature before the end of > > the week;however, if you want to take advantage of this feature > > then you will have to ask the XFree86 team or peruse thru their > > release notes for an appropiate video card which supports linear > > frame buffering. > > *smile* Or Xi Graphics (the artist formerly known as ...) > > Actually writing YUV422 and 320x240 makes more sence that 15bpp or > 8bpp TrueColor. The graphics chip can do the color-space conversion. > > What I'm really curious about is whether the Bt848 can do > doublebuffering. I mean an even field into buffer A and an odd field > into buffer B. > > - Thomas > -- > Thomas Roell /\ Ein Nasshorn und ein Trockenhorn > Xi Graphics / \/\ _ spazierten durch die Wueste, > roell@xinside.com / / \ \ da stolperte das Trockenhorn, > / Brumpft! \ und's Nasshorn sagte: "Siehste!"
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