Date   : Sun, 14 Jun 1998 11:06:48 +0200
From   : "Mark Usher" <marku@...>
Subject: Re: bbc > vga

> BBC to VGA monitor
> ------------------------
>
> I recall Mike Cook wrote about this in his series of  Body Build
> Articles for Micro User a few years back.
>
> Look at :
>
http://nylasor.math.aca.mmu.ac.uk/Physics/Acorn/BB/BBindex.html

Yes, or some monitors take green as the sync signal.
I built this circuit and it works pretty well. The problem is the beeb
outputs the horizontal@... KHz (CGA standard) and the VGA
standard is exactly double that@... I then wired a sync doubler
from one of the amiga pages into this circuit and produced the required
output. I got a rock steady output on my VGA monitor, the only problem was
that it was replicated 3 times across the screen.

If anyone thinks they can solve the last problem I'm willing to give you the
details of what I built. It would be nice to get this working on standard
VGA.

Mark Usher