Date   : Wed, 18 May 2005 06:46:24 +1200
From   : Richard Hobbis <rhobbis@...>
Subject: Re: Master power-up failure


Hi Richard & Richard

Thanks for the replies!
Just as well my wife is a good cook, for now I shall eat Humble Pie

<excuse>
I had just finished installing a volume control (it works!) and must 
have bumped the video cable loose a bit. When I came back to turn it on 
again I rearragnged the cables for the disk drive and must have pulled 
the video cable right out but didn't notice... so, no sound because the 
volume was way down and no screen because the cable had come out --> 
looks like a dead Beeb!.
Doh! My bad :]
</excuse>

Thanks anyway
Richard H.


Richard_Talbot-Watkins@... wrote:

>
>
>Richard Gellman wrote:
>
>  
>
>>If the cassette relay is clicking wildly, either:
>>
>>a) The MOS ROM is shagged, and executing arbitrary writes to
>>&FE20 (I think, its the SERPROC control reg.).
>>b) The SERPROC chip itself is shagged, and is entering some
>>weird microcode loop.
>>c) The circuitry around SERPROC is damaged in some way,
>>causing a charge/discharge circuit to flip the relay.
>>    
>>
>
>Another thing which might be worth noting is that even *reads* from SERPROC
>(&FE10) appear to make the cassette relay randomly flick on and off.
>(*MZAP FE00 in Disc Doctor used to demonstrate this quite nicely.)
>
>I don't know if this opens up any further possibilities - I'm not much of a
>hardware guy to be honest.
>
>Rich
>
>
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