13 May
2015
13 May
'15
8:20 p.m.
On Wednesday, May 13, 2015 at 19:40, Marc Verdiell wrote:
...where to get the older CTuL logic IC bus drivers
(the 9956 in
particular) besides from old boards?
With the inclusion of a pulldown resistor to -2V, the TI SN75121 is a
recommended replacement, per page 5-6 of the "HP 1000 M/E/F-Series
Computers I/O Interfacing Guide" (02109-90006 September 1980). It's an
active part:
http://www.ti.com/product/sn75121
-- Dave