how do I connect a BBC micro to a VGA monitor?

From: Dan Williams <dan_williams_at_ntlworld.com>
Date: Sun Feb 1 06:01:09 2004

Tony Duell wrote:

>>I would like to connect the RGB TTL output of a BBC micro to
>>a VGA monitor, does anybody have any pointers - suggestions?
>>
>>
>
>It's very difficult...
>
>The trivial problem is that he RGB socket on a Beeb is TTL level digital,
>the VGA input is analogue. Trivial, because there's only 1 bit per colour
>on the Beeb anyway, so a resistor network will convert the voltage levels.
>
>The difficult problem is that the scan rates are totally different (VGA
>is 31kHz horizontal, the Beeb is 15.625kHz). If you have a multisync
>monitor that will go down to 15kHz (some of the old ones will), then
>there's no problem, otherwise you've got a lot of work either modifying
>the monitor or making a standards converter.
>
>Probably the easiest solution if you're not a video expert is to use a PC
>with a TV input card. You could at least feed the Beeb's composite output
>into such a card (do any such cards exist with RGB inputs?)
>
>-tony
>
>
>
wasn't there a hack on the mainboard to convert the composite to colour

Dan
Received on Sun Feb 01 2004 - 06:01:09 GMT