What to use a 4.5" B&W TV for?

[Alexis]

On Monday 23 March 2009 22:00:51 Henk Gooijen wrote:
> > From: thrashbarg at kaput.homeunix.org
>
> With an embedded CRT controller (e.g. 6845) and some memory you could build
> an tiny / cool / goofy terminal ;-)  You probably also need a small CPU in
> it. Attach a mini keyboard, build it together in one housing, wrote some
> software. AFAIK, the vt4 project from Bob Armstrong connects to a VGA
> monitor. Pity, because the vt4 will also connect a PS/2 keyboard.
> Maybe a vt4 plus VGA->composite conversion?
>
> - Henk.

The issue of VGA to composite output doesn't exist. The television has one IC 
(AN5151) which does all the IF demodulating and so on. It has a horizontal 
sync output, which goes off to the flyback transformer and horizontal 
deflection coils, and a built in vertical deflection amplifier. I could 
replace the IC with a stand alone vertical generator (TDA1170) to take the 
vertical sync and connect the horizontal sync source to the original 
horizontal sync output.

In fact if I wanted to have a composite sync input I would have to use a 
decoder.

Alexis.