Date   : Thu, 09 Feb 2006 23:42:21 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: B+ 64k won't respond to keyboard, Econet fitted

neil f wrote:
> I've got a B+ 64k here, issue 1 board, with Econet fitted and no extra
> ROMs. It won't respond to keyboard input - flashes the cursor in the
> usual way but seems to be waiting for something else.
 
Do you get a '>' prompt or just:
 
BBC Computer
Econet Station xxx
_
 
If so, it is trying to log on. Try doing Shift-Break.
 
Keyboard link 5 swaps the Break/Shift-Break function.
 
> It started out with the 'no clock' message, and showed no response to
> key presses, so I pulled the 68B45 chip. Now it just says Acorn OS
 
Removing the 6854 wouldn't change keyboard behavior.
 
> 64k, BASIC, with the usual arrow cursor, but still doesn't respond to
> key presses (except Break and Control/Break). I've tried a different
> keyboard and cable, with the same result.
 
Hmmm. Looks like something on the motherboard trying to access the
keyboard isn't working. You've swapped the keyboard, so you've
already made sure the cable is plugged in tightly.
 
Possibilities are:
 
- keyboard cable misaligned - make sure no pins miss the side of
the connector.
 
- keyboard pins on motherboard broken or bad solder joint.
 
- System VIA not pushed tightly into IC socket - try pushing the
6522s firmly down.
 
- System VIA not working - try swapping it. If you haven't got a
spare 6522, swap the two 6522s on the motherboard, swapping the
System VIA with the User VIA which controls the User and Printer
ports.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
RISC OS Choices System - http://mdfs.net/Software/RISCOS