Date   : Wed, 07 Feb 2007 06:38:48 -0000
From   : christopher.whytehead@... (chris whytehead)
Subject: Name that ULA

Hi
>
> > .... and I've come across five of an unusual looking ULA chip.
> >
> > It is a very flat, 4-sided affair, with the markings etched out of a
> > gold square. The casing is ceramic, with not actual pins to speak of.
> > Rather the connections spread out on the underside from the central
> > "core" to form pads to which spring contacts in the matching socket
> > contact with.
> >
> > The chip is marked "FERRANTI ACORN ULA 12CO21M-33 8422".
>
> I think it may be the ULA from an Electron. The chip was held in a clip on
> the mainboard on a couple I've had. Some models of 286 used a similar
> package.
>
Looking at the Electron Service manual, the ULA is shown in the Parts list
as Integrated Circuit 12CO21, which looks like conclusive proof that the
chip is an Electron ULA.

Chris
--
How does a project get to be a year late?... One day at a time.
Chris's Acorns    http://acorn.chriswhy.co.uk