Re: Cheese Video Box

["Lee Cremeans" <lee@lcremeans.homeip.net>]

<noone@nowhere.net> wrote in message 3E36FC76.1030801@nowhere.net">news:3E36FC76.1030801@nowhere.net...
> Hello all:
> I just acquired one of these nifty little buggers from the internet.  It
> is a scan doubler that has an S-Video and a composite input and will
> output that information to a VGA/S-VGA monitor.
>
> What I was wondering is if anyone has hacked one of these to take the
> RGB output of the IIgs?  I looked up the specs on the chips inside
> (Averlogic's AL250 and Phillips SAA7111) but just can't figure out where
> I'd patch in an RGB signal for the doubler to work on.  If you
> understand this stuff and can lend me a hand, I'd certainly appreciate
> it.  (It is for my portable IIgs project.)

It looks like it won't be able to do what you want without extra chips,
unfortunately.

The Philips chip is indeed a analog-to-digital video converter, but if I
follow the spec correctly, it only accepts composite or S-video (Y-C) as
input. You'd need to have some way of converting the GS's raw analog RGB to
one of the formats the Avermedia chip supports (5-6-5 16-bit RGB or 4:2:2
YUV), and then patch that into the digital video bus.

-lee