Date   : Wed, 07 Jan 2015 13:10:35 +0000
From   : jgh@... (J.G.Harston)
Subject: Serial console active at power-on

nicola giacobbe wrote:
> I am just a little troubled by the correct addresses: are we sure that
> the address are stable among ROM versions on the beeb? And on the
> Master? I suppose I should first disassemble the ROM...

The default values always start at the address in &FFB7/8.

For instance, on MOS 1.20 &FFB7/8 holds &D940, the contents of &D940+n 
is the default value for memory location &200+n, so the contents of 
&D940+&36+num-&A6 is the default value for OSBYTE num when num is &A6 to 
&FC. OSBYTEs &FD-&FF are set specifically on Reset by the Reset state.

See http://mdfs.net/Docs/Comp/BBC/OS1-20/D940 for how the default value 
table is laid out.

-- 
J.G.Harston - jgh@...      - mdfs.net/jgh