14 Sep
1999
14 Sep
'99
2:21 a.m.
Those 1820-xxxx numbers remind me of lots of HP boards I've looked at over
the years.
Dick
-----Original Message-----
From: Christian Fandt <cfandt(a)netsync.net>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Monday, September 13, 1999 7:05 PM
Subject: HP IC numbers was:Re: Britain is Great (Back from the Island)
Upon the date 07:12 PM 9/13/99 +0100, Tony Duell said
something like:
-- snip --
Tony and others:
I can't recall for sure but has someone posted anywhere a cross ref list
between HP house numbers and industry equivalent numbers? I thought there
was some discussion here a long time ago about this but I'm subscribed to
several other lists which could have had the same type of discussion.
Thanks for any pointers folks!
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.antiquewireless.org/
All but 3
parts have a numbering like 1820-0xxx, wher xxx is
Almost all HP logic chips are 1820-xxxx :-). And these ones are not in my
list of equivalents, which means they might well be custom (I would
suspect a lot of them are, since there's nowhere near enough parts to
make a calculator using MSI TTL here).