Re: [Rpcemu] MDF query

On 3 Dec 2012, Jim Lesurf <jcgl@audiomisc.co.uk> wrote:
> In article <01ed4ff852.old_coaster@old_coaster.yahoo.co.uk>, Tony
> Moore <old_coaster@yahoo.co.uk> wrote:
> > On 3 Dec 2012, george greenfield <george.greenfield@tiscali.co.uk>
> > wrote:
>
> > Yes, I think that you're correct. I now seem to remember reading
> > that the version of 4.02 on the 'virtually free' CD had been altered
> > to recognise an extended BandWidth. Is that the source of your 4.02
> > ROM?
>
> I'm currently using RO4.02 from the CD. But before that I was using
> 4.02 from one of my old RPCs to do initial experiments with RPCEmu. So
> far as I recall, RO4.02 worked OK on RPCEmu with a vidc bandlimit
> value that I made ten times bigger.
>
> My understanding (wrt 4.02, anyway) is that the VIDC rate limit value
> is simply specified in a file seen by the boot process. This is to
> block attempts that might fry the old RPC *hardware*. If there is
> another limit written into the 4.02 romset it is news to me.

In http://www.riscos.info/pipermail/rpcemu/2011-October/001387.html Tom
Walker wrote, on 24 Oct 2011, in response to your own question, that

> 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.

It's for 4.02 only at the minute as the required 8MB VRAM patch is
different for each OS version

It would seem that the 4.02 ROM image was altered to allow use of a
higher BandLimit but, as far as I know, this has never been implemented
for 4.39.

Tony




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