Re: [Rpcemu] MDF query

On 3 Dec 2012, george greenfield <george.greenfield@tiscali.co.uk>
wrote:
> In message <55f842f852.old_coaster@old_coaster.yahoo.co.uk>
> Tony Moore <old_coaster@yahoo.co.uk> wrote:

[snip]

> > I believe that RPCEmu089/RO5.xx recognises increased BandLimit
> > values, so large emulated modes are possible, but RPCEmu089/RO4.xx
> > does not, so its modes are limited by the notional capaciy of
> > VIDIC/VRAM.
>
> I've also found RPCEmu089/5.17 accepts a mode (1824 x 1026 x 16M x
> 58Hz) that RPCEmu089/4.02 does not: 1680 x 1050 x 16M x 60Hz is the
> best that the latter would do. The same (modified) monitor def file
> was tested in each case (modified using the procedure suggested by
> Matthew Phillips earlier). 1680 x 1050 x 16M x 60Hz is the best that
> the latter would do. But as this is well beyond the notional VIDC
> bandwidth limits, surely the increased bandwidth limits (in my case
> 380000 760000 1520000 800000) /are/ being recognised...?

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?

Here, the same 1280x760 MDF is used with 4.39 and 5.19. The latter
allows me to select 16M colours, but the former restricts me to 32K,
although it also has an extended BandLimit.

Tony




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