Date   : Tue, 16 Oct 2007 20:52:57 +0100
From   : john.abbey@... (John Abbey)
Subject: Issue 4 freezes in old age

Hi Alex,

That's a coincidence - I took a soldering iron to my spare iss.7 this 
weekend which had the same symptoms of inverted Mode 7 - Just unsoldered the 
small wire link on the back of the motherboard.  With this removed, the 
invert jumper (S36?  Can't remember now...) works correctly - either black 
on white or white on black.

Regards,
JohnA.

----- Original Message ----- 
From: "Alex Taylor" <zeem.uk@...>
To: <bbc-micro@...>
Sent: Tuesday, October 16, 2007 8:28 PM
Subject: Re: [BBC-Micro] Issue 4 freezes in old age


>I was wondering about all this. I've got a bunch of faulty Beebs, one
> of which seems to work - except an odd video ULA problem.
>
> It's an issue 7 that the original ULA caused random flickering cursor
> widths and non-functional 20K modes. My spare ULAs result in an
> inverted mode 7 but the other modes work fine - and these spare ULAs
> seem to work fine in an issue 4 machine. None of them have ever had
> heatsink paste on them.
>
> Does this mean I can modify something on the iss.7 board to make mode
> 7 work properly with the spare ULAs I have? Or do I need a different
> ULA?
>
> The issue 4 used to have a fault where the disk interface would
> 'disappear' if the machine was left on for a while - but it seems to
> work ok now. I used it for three full days in July for a 'retro games'
> activity I ran in my school's end-of-year activities week, and it ran
> fine.
>
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