Re: MMU prototyping

From: Mia Magnusson <mia_at_plea.se>
Date: Mon, 21 May 2018 22:14:52 +0200
Message-ID: <20180521221452.00006b58@plea.se>
Den Mon, 21 May 2018 12:45:51 -0500 skrev Jim Brain <brain@jbrain.com>:
> On 5/21/2018 6:07 AM, Michał Pleban wrote:
> > Hello!
> >
> > Just out of curiosity, does it work on the actual Ultimax too?
> I highly doubt it :-)  I am sure it could be made to work, as it's
> just a CPLD...
> > And if
> > yes, where does the 2 kB of RAM at $0800 come from in this
> > configuration?
> You'd have to know you are running on an Ultimax and then allow the 
> mapping for that 2kB.  Right now, I exclude mapping the entire 4k
> from 0-0fff.

IIRC if you hook up I/O2 you can use that to adress the 2k. If on an
UltiMAX the 2k would end up in the right place. If on a C64 parts of it
will end up in unused I/O space.

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Received on 2018-05-21 23:00:07

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