Date   : Mon, 23 Feb 2004 22:43:04 GMT
From   : Pete Turnbull <pete@...>
Subject: Re: Unknown chip

On Feb 17, 18:33, Wookie wrote:
> In message <Marcel-1.53-0217095847-bc8xSBG@...>
>           Johan Heuseveldt <johan@...> wrote:
> > On Tue 17 Feb, Chris Johns wrote:
> > >
> > > > > > >  CN48415N
> > > > > > >  00201752-01
> > > > > >      ^^^^^^^^^
> > > > > > This is the Acorn part number.

> I've just checked my electron stuff and it's not from any of that
but,
> my plus one is running the plus two rom upgrade and I vaguely
> remember the original rom was shorter so I had a look around the
> images on 8bs and http://8bs.com/see/elecplus3plus1b.jpg is as far as
i
> can tell the chip your looking at :-)

Indeed, it's the original Electron Plus 1 ROM.  I've been away on
holiday otherwise I'd have put you all out of your misery more quickly
;-)  In case it helps in future, you might like to know that numbers
like 201,... represent custom parts -- often ICs such as ROMs, ULAs,
PALS, ASICs, etc but also case parts, custom cable assemblies, etc.
 70.,... is for MOS chips, 74.,... is for standard (usually TTL) chips,
78.,... for transistors etc.

Johan mentioned the 4-chip set for MOS 0.1 -- that was (as far as I
know) only ever released as 2732 EPROMs (and of course the one-chip 0.1
version was a single mask ROM).

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York