Date   : Thu, 21 Apr 2011 01:52:28 +0100
From   : jgh@... (J.G.Harston)
Subject: making replica acorn cards

Pete G. wrote:
> I also had thoughs about whether it would be poss to use the roms   
> from the BBC basic card for the Atom to run BBC basic on the    
> System, but the huge flaw in the Atom-BBC Basic conversion card,   
> namely that it doesn't support Atom DOS (!!!) makes this a non   
> starter!

Should be possible with a bit of coding work. When switched in
BBC memory map, the DOS is still im memory at &E000, and there's
space at &C000-&EFFF for extension/MOS ROM. Looking at the
schematic shows two spare ROM sockets labelled "BBC MOS C000"
at &C000-&CFFF and "UTILITIES" at &E000-&EFFF.

http://mdfs.net/System/ROMs/AcornMOS/Atom/BBC_OS.S is the Atom
BBC BASIC support MOS.

-- 
J.G.Harston - jgh@...