Date   : Wed, 23 Oct 2002 13:29:38 +0100
From   : Sprow <news@...>
Subject: Re: BBC keyboard playing up

In article <38cd6894b%mjfoot@...>,
   Michael Foot <mjfoot@...> wrote:
> Hi all,

> One of my BBC model B's has had an unusual fault with the keyboard 
> recently.

> I have had a look at the keyboard diagram in the AUG and can confirm that 
> failing keys are all on columns 0, 1, 3, 4 and some others. 
>
> Has anyone encounted this type of behavour before? What ICs control the 
> signals to/from the keyboard?

The system via (you could try swapping this with the less useful user via)
and the shift register on the keyboard itself,talking to eachother over the
not-so-reliable grey molex cable,
Sprow.