17 Dec
2010
17 Dec
'10
10:08 p.m.
On 17 Dec 2010 at 12:36, William Donzelli wrote:
Don't forget that many large manufacturers had their own 'house numbers'
for ICs. Teh HP 1820-series is the best know, but Xerox, IBM, ICL, etc
had them too. It's certainly quire common to see a DIL package with a TI
or National logo and an HP 1280- number.
They are interesting, but no more than weird
numbers on semicustom
devices. Motorola does the same thing, with their SC series of parts
(not MC or XC)..
It was very common back then. I have some 54175 cerDIPs that I
bought way back when that bear cryptic numbers, but they're National
parts, for certain--they were much cheaper than the correctly-labeled
versions.
Of course, this comes from a time when "glue" logic cost real money.
It still does... Or at least i find it does...
-tony