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Date: Thu, 27 Mar 1997 22:41:24 GMT
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From: Richard Tobin <richard@cogsci.ed.ac.uk>
Subject: Re: newest bt848 driver 
To: Steve Passe <smp@csn.net>
In-Reply-To: Steve Passe's message of Wed, 26 Mar 1997 20:49:49 -0700
Organization: just say no
Cc: multimedia@freebsd.org
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> > 0x22  <- what is this?
>  ^^^^  this is something unique we can key in on!  I suspect it will be
> a Philips SAA524x teletext chip.

The teletext chip is an SAA5246AGP/E.

> > 0xc2  <- this is the PLL in the tuner.

The TEMIC datasheet says that the tuner always accepts c2, and accepts
c0, c4, and c6 according to the voltage on pin 11 of the tuner.  I have
measured the voltage on this pin, and it is not in any of the ranges
for those addresses, so I guess it is correctly not responding to any
of them.

I have adjusted the AGC and burst delay registers for PAL, and the
horizontal and vertical active and delay registers for PAL's image size,
and I now get a colour picture on at least some channels.  However
alternate lines of the picture are missing (black, so the picture looks
dim).  Any idea what I might have missed?  Of course I've also had
to hack fxtv slightly too.

-- Richard