Date   : Sat, 02 Jul 2005 08:36:18 +0100
From   : Sprow <info@...>
Subject: Re: Sprow- 'tricking' the MOS on a Master 128

> > In article <004901c57cf2$68592650$0100000a@...>,
> >   Raf <rafg1@...> wrote:
> >> Robert,
> >>
> >> Is it possible to simulate a write situation to location &9881 in
> >> ROM 15, say using the ROM Polling Semaphore?
> >
> > Couple of problems there, the MOS ROM is read only (being a mask ROM, 
> > plus no nWE signal), and the ROM polling semaphore...

...would result in the wrong ROM being mapped in. Not sure why I didn't
finish that sentance!

> >> I wonder if we can get to get the MOS to think that it is holding
> >> &20 there (as BCD) rather than &19. I am hoping that this may
> >> change the century on the Master's clock from 19-- to 20 --
> >
> > Better still, extend the range to 1800-2199 with Doomsday
> > http://www.sprow.co.uk/bbc/doomsday.htm

> Umm......the Doomsday unit(s) that  I bought from you.
> Has there been any updating of the range of  years since
> purchase, Robert?

No update recently, the ones you have are current. I don't expect to be
alive at either end of the date range currently supported,
Sprow.