Date   : Sat, 11 Jul 2009 13:04:19 +0100
From   : acorn@... (Andy Ford)
Subject: Using a B keyboard on a Master

Thank you Michael and Rob.

I decided (as there is a little room around pin 38) to merely cut the 
track (as it appears to only be connected on the solder side anyway from 
what I can see) , plus I would be able to do a quick "undo" to put 
things easily back as they were if needed. :)

Unfortunately this did not have any effect. I then powered down, 
connected pin 38 to +5v and powered up again. Keyboard was still not 
responsive. An interesting side effect of tying pin 38 to power, the 
display all moved down about six lines or so (the same effect as a *TV 
command would have)

Hmm...


Andy.


Michael Firth wrote:
> Probably worth soldering a wire from the chopped pin to the power pin too,
to ensure that the IC sees the pin as solidly high.
>
> Regards
>
> Michael
>
> -----Original Message-----
> From: Rob <robert@...>
> Sent: 10 July 2009 22:37
> To: acorn@...
> Cc: bbc-micro@...
> Subject: Re: [BBC-Micro] Using a B keyboard on a Master
>
>   
> A quick glance at the circuit diagram points at IC16 as the keyboard
> decoder - is it socketed?  If so, pull it out.
>
> Otherwise there seems to be no links or jumpers to select it... if
> it's not, snip pin 38, nKBEN (in a way that means you can solder it
> back together again) and see if that helps...
>
> Rpb
>
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