Date   : Wed, 26 Feb 2003 14:59:38 +0000 (GMT)
From   : Brian Widdas <brian@...>
Subject: Re: Master 128 on a TFT flat screen???

On Wed, 26 Feb 2003, Richard Gellman wrote:

> >Anyone ever attempt using a Master 128 with a PC monitor thru somekind of
> Video to SVGA adapter?  I know this will probaby work with the mono output,
> but
> >I'd like to use color.  Is there an RGB to video converter out there that
> will do this?
>
> I've used an Archimedes Monitor with My M128.. So in theory it should work..
>
> >if not,  does anyone happen to know what color  the RGB output from the
> Master 128 uses to sync with and at what freq?
>
> The RGB output of BBC Micros does not place the sync information on any
> colour line, there is a separate sync line.
>
> I believe, for compatibility reasons, the BBC Micros output a picture that
> conforms to TV standards, such that the picture can be output on UHF,
> Composite, and RGB without the need for extra translation electronics. Im
> not sure of line frequency, but the field frequency would be a TV standard
> 50Hz.

Indeed.

The RGB signal is at TTL levels, though - the monitor would most likely
get very upset by it.

Also, I believe a VGA signal uses separate horizontal and vertical sync
lines, whereas the BBC's sync output is composite, so you'd need to
arrange a sync-splitter.

If there's an online archive of Mike Cook's Body Build articles anywhere,
I believe he covered BBC->VGA converters back in the days of The Micro
User.

Brian
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