Date   : Fri, 10 Dec 2004 10:52:18 +0000
From   : Richard_Talbot-Watkins@...
Subject: Re: Video ULA shenanigans

Tom Walker <tommowalker@...> wrote on 09/12/2004 15:36:10:

> > so what does a real Beeb do when given:
> > 80 characters per line, low clock rate
>
> This generates a mode 0 like display, but with every
> other character column completely white.

How odd.  I guess it's just a strange side effect of the coding of the ULA.

> > 10 characters per line, high clock rate
>
> This is like mode 2, but first pixel in each byte is
> duplicated - the second pixel is not displayed at all.

As for this one, this basically *is* an 8bpp 80 pixel wide mode.  Can't
think of any use for it at all unfortunately.

> Another potential mode is high clock rate, teletext -
> I haven't tried this though.

This one I hadn't considered.  Has anyone ever got any results out of this?
An 80-column teletext mode would be great, but as possible as it seems in
my head, I bet there's gotchas...

Rich



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