Date   : Thu, 14 Feb 2008 08:33:10 +0000 (GMT)
From   : info@... (Sprow)
Subject: Model A (16K) RAM memory map?

In article <47B3FAB8.8080408@...>,
   Mark McDougall <msmcdoug@...> wrote:
> OTOH if it is mirrored for reads, then how does the ROM work 
> out if it's a 16K or 32K machine?

Simple:
 write 0 to &0000
 write 0 to &4000
 write 1 to &0000
 read from &4000, if it's 1 then there's 16k of RAM
Sprow.