23 Sep
2011
23 Sep
'11
12:25 a.m.
On 2011 Sep 22, at 2:07 PM, Tony Duell wrote:
> Just as a follow up, the HP 2100 in Germany went
for approximately
> $550 US
> http://www.ebay.com/itm/250891468434
...
, IIRC the 2100A used some odd 'Current Transfer
Logic' ICs).
The early models of the HP 2100 series used Fairchild CTuL:
Complementary Transistor Micro-Logic.
Non-saturating current-mode logic like ECL, using both PNP and NPN
transistors.
http://www.cs.ubc.ca/~hilpert/e/HP21xx/CTL.html