Date   : Mon, 02 Mar 2009 11:13:17 +0100
From   : kortink@... (John Kortink)
Subject: New Screen Modes with ARM7 Co-Processor?

On Mon, 2 Mar 2009 09:52:41 -0000, "Ian Wolstenholme"
<bbcmailinglist@...> wrote:

>At the back of my mind I remember something from the Advanced
>User Guide or suchlike which allowed you to program your own 
>screen mode.  The example they had either gave higher resolution or
>more colours using half of the usual RAM requirement for the standard
>screen mode.

It's not a magic trick. It's just MODE 2 with half
the horizontal resolution and therefore taking half
the memory.

>So, with memory in abundance on the ARM7 co-processor, would there
>be a way of creating new screen modes, say an 8-colour mode at
>Mode 0 resolution, or even higher?

It has nothing to do with the availability of memory
but with the restrictions of the beeb's video system.
So until someone improves that, no.


John Kortink

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