Date   : Sat, 02 Jul 2005 08:47:19 +0930
From   : "Raf" <rafg1@...>
Subject: Re: Sprow- 'tricking' the MOS on a Master 128

Hi Robert,

Thanks for all your help.

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

Actually, I would have to pull out all my Masters to see
how many I bought from you. Most are in stored away..

Best wishes

Raf




----- Original Message ----- 
From: "Sprow" <info@...>
To: <bbc-micro@...>
Sent: Saturday, July 02, 2005 5:59 AM
Subject: Re: [BBC-Micro] 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
>
>> 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
> Cheers,
> Sprow.
>
>
>