21 Nov
2014
21 Nov
'14
5:33 a.m.
On Wed, Nov 19, 2014 at 2:43 PM, tony duell <ard at
p850ug1.demon.co.uk> wrote:
> What is Current Transfer Logic, the machine seems to be full of such ICs? Any data
sheets,
. > etc out there?
I don't know about Current Transfer Logic, but my
vague recollection
(probably wrong) was that it used Signetics Utilogic II and Fairchild
CuL or CTuL families. There are three different years' Utilogic
databooks on Bitsavers. There is some data on CuL and CTuL in the 1969
Fairchild Data Catalog on Bitsavers.
Yes, you're right. It's CTuL. The HP parts lists in the manuals call them
'CTL', I foolishly
looked that up on Google and got a translation to 'Current Transfer Logic'. No,
it's
'Complementary Transistor microLogic', which seems to be somewhat ECL-like.
The HP2100A and the interfaces I have seem to be a mixture of CTuL and normal
TTL parts. I assume the former are unobtainium now, let's just hope that's not
where any faults are.
I will take a look at the Fairchild book on bitsavers, thanks...
-tony