Date   : Wed, 01 Oct 2003 12:13:36 +1200 (NZST)
From   : Michael Foot <mjfoot@...>
Subject: Re: BBC Micro lazy delayed boot!

Quoting Andrew Hancock <Andrew.Hancock@...>:

> Thanks to Pete Turnbull on this list I've got a logic probe. So I can
> start
> probing around the motherboard having a look at various logic states.

I can't help here sorry, but I have come across a similar situation. I have a 
Model B motherboard that will not fully boot past the DFS 1.20 initialisation. 
I've had a quick look and found that it will boot (without DFS) if I remove 
either the 8271, DFS120 ROM or the left most rear DFS upgrade IC. I don't have 
a BBC in front of me to tell you which IC number. It will also boot (without 
DFS being initialised) if I turn VR1 (left most near -5V) completely low which 
is weird because I always thought VR1 was to do with the sound volume.

All the ICs and ROM are good.


Cheers,

Mike.

--
Michael Foot <mjfoot(at)paradise(dot)net(dot)nz> *
http://homepages.paradise.net.nz/mjfoot/
* Replace letters between () with @ and . when replying