Date   : Sun, 15 Feb 2009 21:24:15 -0000
From   : jumbos.bazzar@... (Mark Haysman)
Subject: Dead(ish) BBC B - Pleae Help

Hi.

Sounds like a classic case of a dead System VIA at IC3. Take the one out if 
IC69 and put it into IC3 spot, see if it cures it. Could be a bad socket, 
that system VIA controls the keyboard and the slow bus to the Sound chip.

Mark.

----- Original Message ----- 
From: "Peter Rendle" <pete@...>
To: "BBC micro mailing list" <bbc-micro@...>
Sent: Sunday, February 15, 2009 9:15 PM
Subject: [BBC-Micro] Dead(ish) BBC B - Pleae Help


>I have just fixed the PSU on an Issue 7 model B and am getting some odd
> startup behaviour.
>
> I get the usual startup tone but it does not stop.  The display works
> and I get the usual "BBC Computer 32K","BASIC" and the prompt.  Then I
> get an additional tone producing an interesting "chord".  The keyboard
> is unresponsive except the break key which does work. After the break I
> get a different set of tones but still continous and keyboard not working.
>
> The PSU works perfectly on another machine and the keyboard is also
> known to work on that other machine. No disk interface is fitted and the
> MOS and Basic roms are also known working from the other machine.
>
> Can anyone suggest what might be wrong?
>
> Many Thanks
>
> Peter
>
>
>
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