Date   : Sun, 19 Apr 2009 21:19:22 +0200 (BST)
From   : johan@... (Johan Heuseveldt)
Subject: Easter Disaster

Hi,

On Sat 18 Apr, Alex Taylor wrote:
> 2009/4/18 Andy Ford <acorn@...>:

> > The keyboards are different in that a B has a single connection of about
> > 17 pins and the Master has two sets of 15, I am going from memory here
> > so those numbers may not be 100% correct.
> 
> There's a place on the Master PCB for a pin header which isn't
> normally fitted. It's just below the keyboard connector and connects
> to many of the same PCB traces. I never noticed it before, until
> someone on the list briefly mentioned its existence, and something
> about its use for connecting up a Model B keyboard.

Yes, many moons ago I've reported that to this list. :-)

After experimenting there's a little prob with it: you need to pull
out the keyboard encoder for the Master keyboard. And most Masters
had this soldered on the PCB. There was only one Master 128 here
that has the chip socketed. After removing this and soldered in
the 17 pins header I connected a BBC-B keyboard which was then
fully functional!

FWIIW

[snip]

Greetings,
Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place

Pedants rule Ok - or, more accurately, exhibit
certain of the trappings of traditional leadership.