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

George george.greenfield at tiscali.co.uk
Tue Aug 13 06:59:14 PDT 2013


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.

> 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.

George



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