Date   : Thu, 16 Aug 2007 15:03:36 +0100
From   : profpep@... (Mike)
Subject: The ""other" M128 battery location...

> Hmm, I just noticed that there are +/- symbols in the little recess of the
> M128's plastic moulding, between the speaker and cartridge sockets...
>
> I don't remember that being mentioned before - anyone know the story
behind
> it? Were Acorn hoping to put a single CMOS battery here? Or was it planned
for
> some other (non-CMOS) use?
>
> All my machines have it, so I assume it's present on every Master.
>
This is where the original attempt at a backup bettery went. It was a
lithium battery, and IIRC some problem  reverse charged it, causing some to
catch fire. Whether this only occurred under fault conditions or with
certain batteries I do not knw.

The original is on page 243 of the Master Welcome guide, (the one with the
cream cover).

||\/||ike