Acorn BBC Micros - test-drb@ccmp.vtda.org

4 Nov 1998

On Nov 4, 19:43, Tony Duell wrote:

...
  > I guess I'd need a PAL monitor 
...
  Well, there are 3 monitor outputs on a BBC micro.

...
  The second is a BNC socket carrying composite video.
By default this is
 monochrome (no PAL subcarrier), but you can add an internal link on
 late-version machines to add the colour (PAL, of course) information. 
On the earlier machines (Issue 2 or 3 PCB) you just need to add a 47nF
capacitor to link the colour burst signal from the circuit that drives the
modulator, to the circuit that drives the composite video.

...
  The last video output is a 6 pin DIN socket. It
carries TTL RGB signals
 and compositie sync. If you can find a RGB colour monitor that can use UK
 rates (and a lot can), then you can connect it here. 
The Philips 8833 monitors that (at least in Europe) were badged by
Commodore and Atari for Amigas and STs work very well.  But be warned - the
Beeb outputs composite sync, and the centre pin of the RGB connector goes
directly to the +5V supply -- which a few monitors don't like.

-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York