Date   : Mon, 03 Mar 2008 16:35:12 -0000
From   : dl.harper@... (David Harper)
Subject: TUBE code in the Master

Steve Bass wrote:

> This leads on to my question, which in order to create room, I realised 
> that
> in the DFS and ADFS, contained within the MEGAROM in the Master, they do 
> not
> contain the TUBE code so I was wondering if anyone has the answer as to
> where this code is located.  I assume it's in the MOS part of the MEGAROM
> but as yet have not had time to investigate.

It is actually within Sideways ROM bank &F, and is copied down into the 
language workspace (the lower part of Page 0 and Pages 4 to 6) in response 
to the issuing of Sideways service call &FF. This call is issued during the 
reset sequence if a second processor is detected.

There is a lot of miscellaneous MOS stuff in bank &F on the Master. The bank 
is nominally assigned to "TERMINAL", but the code for this is quite small so 
the remaining space is filled with all sorts of other MOS routines, 
including the Tube code.

David Harper