Date   : Mon, 08 Nov 2010 12:14:48 -0000
From   : jumbos.bazzar@... (Mark Haysman)
Subject: BBC B micro repairs

From: "Mike Tomlinson" <mike@...>

<snip>
> I'd take both out and see if the behaviour changes.  If it does, put the
> user 6522 in the system 6522 position and try again.
>
> The machine will mostly boot with both VIAs absent (but you'll only get
> a cursor.)
<snip>

Actually, with both VIAs removed the system will (should if working 
properly) boot completely, to a BASIC prompt, you just obviously won't be 
able to do anything as you have just removed the keyboard interface. That's 
a good way to fault find boards that won't boot, without haivng to have a 
keyboard attached.

Mark.