HP board id?
pbirkel at gmail.com
Thu May 14 00:46:12 CDT 2015
Very interesting. What do they recommend on the receiver-end?
Is the "HP 1000 M/E/F-Series Computers I/O Interfacing Guide" (02109-90006
September 1980) available online somewhere?
On Wed, May 13, 2015 at 11:20 PM, J. David Bryan <jdbryan at acm.org> wrote:
> 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:
> -- Dave
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