Date: Fri, 28 Mar 1997 16:25:40 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Richard Tobin <richard@cogsci.ed.ac.uk> Cc: Steve Passe <smp@csn.net>, multimedia@freebsd.org Subject: Re: newest bt848 driver Message-ID: <199703290025.QAA00649@rah.star-gate.com> In-Reply-To: Your message of "Fri, 28 Mar 1997 14:57:09 GMT." <27703.199703281457@pitcairn.cogsci.ed.ac.uk>
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>From The Desk Of Richard Tobin :
> Something else that needs to be changed is in METEORSETGEO. The magic
Well thats what you are supposed to do 8)
> numbers 910.0, 480.0 and 240.0 are NTSC-specific. I guess different
Read the data sheets which I made available to you pending upon which
input format is detected by the B848 the calculations in meteorsetgeo need
to be calculated accordingly.
> numbers can be used depending on the format; this would mean that users
> would have to be sure to set the format *before* setting the geometry.
The card is fully capable of detecting the input format:
Register number 4 (BKTR_IFORM)
bits 2 - 0:
000 auto format
001 NTSC M
010 NTSC w/o pedestal (Japan)
011 PAL (B, D, G, H, I) input format
100 PAL (M) input format
101 PAL (N) input format
110 SECAM input format
111 Reserved
> Alternatively the driver could re-set the geometry when the format
> was changed.
>
> By the way, what is the magic number 1.21875 in METEORSETGEO. Is it
Good Question! The formula in the Bt848 databook is wrong so I came up with
my own formula 8)
> the ratio of total horizontal pixels to display pixels? If so, that's
> different for PAL too.
Glad that you are volunteering
Good Luck,
Amancio
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