Date   : Wed, 23 Jul 2003 17:20:38 +0100 (BST)
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Old BBC B

I picked up some interesting Acorn stuff today - including various bits of
Econet kit, Aires boards, a genlock for a Master, 6502 co-processor boards etc.
plus various machines themselves.

One of the things I got though was a very old-looking BBC (with an extremely
battered and yellowed case). The serial number on the case says 3619 on a
sticker underneath, with an identical sticker on the system board. No other
serial numbers on the machine. Most of the chip sockets are white, not the
normal black plastic. The heatsink on IC6 is bigger than I remember on other
machines I've seen. Build date appears to be around December 1981; the board's
an issue 3 though.

Plugged into the socket for IC78 is a WE daughterboard marked as "DDB3". Any
ideas what that does? 

IC's 81 to 86 are just empty sockets, with pins 1 and 4 shorted on IC86. My
schematics aren't to hand to see what those should be.

One of the ROMs is in a dual-height package with a sticker saying "RAM" on the
top. A red wire also comes out of this module and is soldered to pin 11 of
IC76, and there's also a black trailing wire going to an IC pin clip (which
currently isn't connected to anything). Any ideas what this is? System clock
module, or something more interesting?

I need to clean out the mice and test the PSU before I try actually powering it
up and see if it still works. Keyboard and case have both seen much better days
but there was a dead machine on the same site or a similar age which I might
grab tomorrow for parts.

cheers

Jules


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