Date   : Wed, 16 Sep 2009 11:53:38 +0100
From   : dominic@... (Dominic Beesley)
Subject: No longer Mouldy Beebs

Thanks All,

I'll go for a play on it now for an hour and keep a can of freezer spray
handy to see if I can find out whats up.

I'd say it definitely seems to be heat related as the machine was running
A-ok this morning when I briefly tested it.

Dom

-----Original Message-----
From: Phil Blundell [mailto:philb@...] 
Sent: 16 September 2009 11:42
To: Dominic Beesley
Cc: 'Chris Johns'; 'BBC MailList'
Subject: Re: [BBC-Micro] No longer Mouldy Beebs

That's the later (VLSI-sourced) VIDPROC.  Those ones shouldn't need a
heatsink, although it's normal for them to run a bit warm: Chris is
correct that it's only the Ferranti ones that need extra cooling to work
properly.

Your symptoms below don't sound particularly VIDPROC related.  If the
video processor was having trouble then the screen would certainly go
wrong but I wouldn't have expected the other effects that you mention
(spurious input and then total lockup).

p.

On Wed, 2009-09-16 at 11:24 +0100, Dominic Beesley wrote:
> Hi Chris,
> 
> This is the chip just above the ROMs, to the right of th CPU/VIA. Mine
are marked (C)Acorn and what looks like a VLi symbol? (Picture at http://i743.photobucket.com/albums/xx75/dominicbeesley/vidproc.jpg)
> 
> No signs of heatsinks anywhere. 
> 
> Dom
> 
> -----Original Message-----
> From: bbc-micro-bounces+dominic=brahms.demon.co.uk@...
[mailto:bbc-micro-bounces+dominic=brahms.demon.co.uk@...]
On Behalf Of Chris Johns
> Sent: 16 September 2009 10:46
> To: 'BBC MailList'
> Subject: Re: [BBC-Micro] No longer Mouldy Beebs
> 
> On Wed, 16 Sep 2009, Dominic Beesley wrote:
> 
> > I?ve so far managed to assemble one good machine from the four, 
> > however after about an hour of games last night it packed in with what 
> > I presume is overheating ? the video processor was hot and its back to 
> > normal this morning, though it quickly got hot again. The symptoms 
> > were random characters being sent to keyboard buffer and memory 
> > corruption worsening to reboots going to a mode 7 screen full of 
> > character &FFs. Is this a common problem?
> 
> One sort of video processor (the older type) needed a heatsink. I think
it was the Feranti ULA version - if you have one of these does it have the
heatsink and if it does it is stuck on with some thermal sticky stuff?
> --
>   Chris Johns <chris@...>
> 
> 
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