Date   : Wed, 08 Sep 1999 23:31:49 +0200
From   : "Mark Usher" <marku@...>
Subject: Re: VGA adapter for the BBC micro (FWD)

>There was an article about this in Mike Cook's excellent
>BODY BUILDING series in the Micro User. This should be online
>so perhaps someone can remind me of the address ...

http://math.mmu.ac.uk/Physics/Acorn/BodyBuild/index.html

Don't get your hopes up to much though. There is an article here that
details how to spilt the combined V + H sync signals.
I did have a look at some of the possibilities and built the above sync
splitter board to make the connection. This worked on a standard CGA monitor
but not on a VGA monitor.

I then used a sync doubler to double up the frequency from 15.625 (CGA) to
31.5 (VGA). This was a circuit that Chris Thornley put me onto, and was
originally intended for the Amiga. I had a stable picture, but unfortunately
it was "ghosted" 3 times across the screen.

IIRC the amiga has the same output levels as the Beeb and there are quite a
few docs and circuits around on the net that detail how to make this
conversion. Just do a search via Alta Vista for "amiga" and "VGA" etc. You
will find something.

Let us all know how you get on. I am still sure it is possible for this to
work, it just requires someone with a little more than my basic knowledge.

Mark