[Rpcemu] Can't get Monitor def file to work under 0.8.10/5.20

Tony Moore old_coaster at yahoo.co.uk
Tue Aug 13 07:36:29 PDT 2013


On 13 Aug 2013, George <george.greenfield at tiscali.co.uk> wrote:
> In message <9581917a53.old_coaster at old_coaster.yahoo.co.uk>
>           Tony Moore <old_coaster at yahoo.co.uk> wrote:
> > On 12 Aug 2013, George <george.greenfield at tiscali.co.uk> wrote:
> > > In message <537a295b6crpcemu-sub at aconet.nl>
> > >           Frank de Bruijn <rpcemu-sub at aconet.nl> wrote:
> > > > In article <a98a207a53.George at george/greenfield.tiscali.co.uk>,
> >
> > > > > However, the RISC OS-Configuration-Screen-Resolution available
> > > > > options don't go higher than 1280 x 1924 x 16M x 60Hz for the
> > > > > particular Benq MDF I'm using
> > > >
> > > > That's to do with the maximum pixel rate.
> > > >
> > > > See http://www.riscosopen.org/forum/forums/10/topics/1624
> > > >
> > > > I have added these to my MDF and they work:
> > >
> > > [MDF details snipped]
> > >
> > > Thanks, Frank: I've done likewise and you're right!
> >
> > In an earlier post, George said that RPCEmu 0.8.10 / RO 5.17 could
> > display 1280 x 1924 x 16M x 60Hz
>
> Sorry, what I actually meant to say was that 1280 x 1024 x 16M x 60Hz
> was the highest available display resolution on 0.8.10/5.20, whereas
> 0.8.10/5.17 will go up to 1824 x 1026 x 16M x 60Hz on my system.

Whatever, it doesn't alter the point that I was making.

> > whereas RPCEmu 0.8.10 / RO 5.20 could not. The hardware is emulated
> > by RPCEmu, which is the same version, in both cases, so that could
> > not account for the difference.
> >
> > RO 5.20 'protects' the emulated hardware by setting the value of
> > VIDCBandwidthLimit to 2000000000. For a 32 bbp display, that implies
> > a pixel rate of 500 MHz, which should not be a problem for the host
> > Windows machine, and which is certainly greater than the 148 MHz
> > pixel rate, required George's display.
> >
> > I'm somewhat confused as to what is actually limiting the display.
>
> Be that as it may, amending the pixel rates in the MDF file (from a
> max. of 144000 down to 108000 here) has made resolutions above 1280 x
> 1024 x 16M both visible in the Configuration-Screen options box and
> useable.

I'm not disputing that reducing the pixel rate has solved the problem.
However, as said above, I don't understand why that should be.

Tony






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