Date   : Mon, 16 Apr 2001 08:52:11 -0700
From   : Angus Duggan <angus@...>
Subject: Re: Confusing tube

Mike Tomlinson writes:
>In article <INEBINJGPKFAHFODGMHCCEBGCBAA.r.gellman@...>,
>Richard Gellman <r.gellman@...> writes
>>On switch-on the tube software is copied from the DNFS ROM in the I/O
>>processor to the 4,5,6 and 7 [sic] in the I/O processor.
>
>perhaps it means pages 4,5,6,7 ?  The I/O processor is the BBC itself.
>To be honest, I thought the Tube code got loaded at &0D00 so not sure
>what is meant here.

Correct. The Tube-side code resides in &400-&700. There is also a little bit
of code copies into zero page at &16, and parts of page 1 (the 6502 stack)
get used as OSWORD control blocks (ugh!)

a.