Date   : Sat, 11 Feb 2006 13:55:07 -0000
From   : "neil f" <faz@...>
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
> _

I get the full ">_" prompt with flashing underline.

>  
> If so, it is trying to log on. Try doing Shift-Break.

Shift/Break gives "Searching not found" (i.e. when no extra ROMs or
68B45 chip fitted).

>  
> 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.

OK, but it's out anyway.

>  
> > 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.

Checked and swapped keyboards/cables just in case

>  
> - keyboard pins on motherboard broken or bad solder joint.

Wouldn't that just mean certain keys wouldn't work, rather than all of
them?

>  
> - System VIA not pushed tightly into IC socket - try pushing 
> the 6522s firmly down.

Unfortunately the VIAs are not socketed. I don't want to cut out and
replace them if I don't have to. Also I'm not sure which 6522 is the
System VIA on a B+

>  
> - 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

FWIW, Caps lock/Shift lock LEDs don't change as they should either.

-Neil F.


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