Date   : Mon, 09 Mar 2009 08:35:07 +0000 (GMT)
From   : info@... (Sprow)
Subject: Disable tube?

In article <8BE1E39089934858A656AF0FFDAC6DEC@...>,
   David Harper <dl.harper@...> wrote:
> me@... wrote:

> > I'm pretty sure they were fresh, but just in case I replaced them with
> > three new AAs, reset the CMOS, re *CONFIGUREd everything, and...

[snip]

> perhaps you could try using them 
> to write to CMOS byte &F which contains the Tube status bits. (I am not 
> sure which bits

For reference:
 http://www.sprow.co.uk/bbc/library/cfgbits128.txt
 http://www.sprow.co.uk/bbc/library/cfgbitscompact.txt

Sprow.