Date   : Tue, 02 Jan 2007 23:29:48 +0000
From   : adsb@... (Andrew Benham)
Subject: MOS ROM Structure

Richard Gellman wrote:

> Obviously this requires making a new 1Mbit ROM chip with a patched ADFS 
> in it. So my questions are thus:
> 
> Is this a standard 128Kbyte ROM, or is there unusual/unexpected address 
> decoding going on to map in the 16K OS ROM?
> Does the chip use a standard pinout? My intention is to use a 27C1001 
> (128k x 8) if compatible.
> In what order are the ROMs laid out? I assume the paged ROMS are in the 
> same order they appear in *ROMS, but where would the MOS ROM fit, I 
> would hazard a guess at the end after ROM "15" (TERMINAL)?

The info at
       http://www.adsb.co.uk/bbc/bbc_master.html
may be of some help to you.


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

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