Date   : Tue, 15 Dec 2009 11:54:57 +0000
From   : acorn@... (Andy Ford)
Subject: Issue 1 versus issue 2 of Master 128?

I would be very interested in this too as I have a list of changes 
between issues for 'B's but not for Masters. :)

The only differences I have noticed really (and I'm not sure if they 
would apply to all issue 1 vs issue 2)

The keyboard decoder IC is socketed on some (early issue 1 maybe ?)

The (very early maybe ?) MOS rom is not just a plug in IC, its mounted 
on a small daughter-board with a couple of 74 logic chips. (I have one 
lying around, I'll get a pic if needed)

I think (I'm just guessing with this one) the battery pack was changed 
between issues, possibly just the location of it.

Andy.


Sprow wrote:
> Hi folks,
> Anyone seen any documentation on what changed between issue 1 & 2 of a
> Master?
>
> Places I looked:
>  Google, there's a mention on the BeebWiki but no actual meat.
>  BBC Micro Mailing List, a thread in 1998 asks the question but no answer.
>  BBC Master Service Manual, mentions issue 1 in the fault finding index.
>
> I'm trying to track down a weird problem and the only thing I can see on the
> surface as different is one says "ISS1" the other says "ISS2". Any pointers
> appreciated,
> Sprow.
>
>
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