Date   : Tue, 16 Jun 2009 18:07:31 +0100
From   : robert@... (Rob)
Subject: Black Teletext

On 16/06/2009, Ian Wolstenholme <bbcmailinglist@...> wrote:
> Oo err, all a bit beyond me, daughter boards and all,  but the VSync event
> might be a goer.  I suspect it would be a bit much to check all 1024
> locations
> on a VSync event, but  perhaps I could check a quarter of the screen every
> 50 VSyncs, something like that.  There would be a bit of a delay in
> updating,
> but it wouldn't matter too much for my purposes.
>

I used to parse and display an entire Prestel frame on the VSync
event, and adjust the cursor position, so I can't see a tight loop
through 1024 bytes taking that much time... Just remember to check
you're actually in mode 7 first...