HP board id?
J. David Bryan
jdbryan at acm.org
Wed May 13 22:20:46 CDT 2015
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
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