Date   : Tue, 13 Dec 2011 08:17:51 +0000
From   : bbc@... (Dave Curran)
Subject: 32016 + 32082

On 13 December 2011 00:50, Jules Richardson <jules.richardson99@...>wrote:

>
> However, none of my boards have a socket fitted for IC6, unlike yours -
> which might suggest that yours once had something fitted there that has
> gone AWOL. I don't know if that IC is related to MMU functionality,
> however.
>
>
There are spaces above IC6 and IC16 for decoupling capacitors, and neither
are fitted, which seems to suggest that the ICs were never intended to be
installed. Why there is a socket on IC6 though, I don't know.

And on the subject of decoupling capacitors, the ones marked 'B' and 'C'
next to the 32082 look to be different to the other ones marked 'B' and 'C'
on the rest of the board. Normally all the 'B's would be the same and all
the 'C's would be the same, which suggest perhaps that they was retrofitted
to the normal board.

Also, thanks to the excellent photograph, it appears that unlike IC3's
socket, IC2's socket is made up of two 24 pin sockets, rather than a single
48 pin as you would expect from a factory assembled unit - the lower one is
slightly wider and obscures the screen printing around the socket.I would
expect to see different soldering on the IC2 socket and it's capacitors,
and possibly on the IC6 socket as well.

And a final bit of archaeology, quite a few of the date codes on the
important chips are around the 8430s, the rest of the board is 83/84 apart
from the 32082, the hand blown EPROMs and the RAM which are 85/86, could
this have been a 64k unit upgraded a couple of years after manufacture?

Dave