In article <[email protected]>,
   Tom Walker <[email protected]> wrote:
> >Is it possible to either use VRAM > 2MB

> This is already implemented for RISC OS 4.02. Some playing with
> bandlimit settings and the like may be required.

Ah! Excellent! Thanks for the above. I'm using RO4.02. Didn't know the
higher VRAM was already available.

It is a very long time since I had to experiment with anything like this,
so some further advice would be welcome on the following points.

In my ...Boot.PreDesk.Configure.!Run file I have the line

/<Obey$Dir> Bandlimit 38000 76000 152000 80000

Is that the relevant set of values?

At present I'm using a screenmode that is

32k colours, 1280 x 700, 55 Hz.

This is on a Laptop with an LCD screen that is 1366 x 768 pixels, so the
above size for screenmode is fine.

At present if I try asking for '32 million' colours via the mode icon on
the iconbar it drops the resolution.

I assume my first step is to change the specified VRAM amount to 4 or 8 MB.
But I'm not sure what else may need changing. Will increasing some of the
above bandlimit values (to what?) be enough? Or am I likely to also have to
alter the Monitor Definition File I'm using?

Since I'm emulating on a machine with an LCD I assume the frame rate can be
lower than 55 Hz without problems. (I'm not playing any videogames or
videos, so a low update rate isn't a worry for me.)  

Slainte,

Jim

-- 
Electronics  http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio  http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc  http://www.audiomisc.co.uk/index.html


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