Date   : Thu, 17 Nov 2005 16:36:43 +0000
From   : Andrew Benham <adsb@...>
Subject: Re:: Master Shadow RAM access?

Richard Gellman wrote:

> Apparently, the "TST" bit (bit 6?) enables read access to the 
> MOS ROM between &FC00 - &FEFF... but I have no idea how much truth rests 
> in that.

I can confirm that - I use it in my code to enable one to save an image
of the whole of the MOS ROM (linked off
http://www.adsb.co.uk/bbc/bbc_master.html
).

There's no code in that area in the original Master MOS ROM (v3.20),
but there is code there in the alternative MOS ROM (v3.50).

-- 
Andrew Benham         adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill"