Date   : Mon, 02 Jul 2018 19:33:36 +0100
From   : pete@... (Pete Turnbull)
Subject: Announce: Brandy Basic - with teletext?!

On 02/07/2018 15:59, Michael McConnell wrote:
> I guess, with the way the screen is currently done (including the other
> modes) that it would be computationally far to expensive to scan the
> screen for what should be flashing pixels. For Mode 7 at the very least
> to get a 100% true emulation it would need to maintain a 1000 byte
> screen memory buffer (somewhat akin to the BBC Micro screen memory at
> &7C00) and re-render the entire screen periodically

Hmm.  Sometime in the late 1990s I wrote a Viewdata client for Unix (or 
more specifically, for IRIX on an SGI Indy running at 180MHz).  I needed 
it for HOBS, the Bank of Scotland online banking system, which I had 
previously used on a Beeb and then an A440.  I had graphics, flash, 
double height and separate/contiguous etc working properly then, so I 
find it hard to believe it can't be done two decades later on 20x faster 
processors, though I guess it might depend on what it's written on top 
of.  I've forgotten exactly how I did it but AFAIR I did use a double 
buffer.

-- 
Pete
Pete Turnbull