16 Mar
2013
16 Mar
'13
3:40 p.m.
Thank you Ethan, John, and Holm. It looks like I have a number of options
in the appropriate era; the variations seem to be only in terms of whether
the Vdd of -12v is required (process-based I presume) and the max.
supported speed (not exactly an issue with a 300 baud, more-or-less board
:-<). I'll socket it and try a suitable candidate then. Doesn't seem that
much can/should go wrong. We'll see about that ...
On Fri, Mar 15, 2013 at 7:22 AM, Holm Tiffe <holm at freibergnet.de> wrote:
Paul Birkel wrote:
The early PDP-11 uses a ?DEC 1801 UART? in
multiple modules. I?ve had no
luck identifying a comparable chip that could be substituted when doing
repairs as there?s a remarkable dearth of information regarding the
characteristics of this part, excepting the pin-out as seen in
engineering
drawings. (No, I haven?t yet tried pin-out
matching ... next step.)
Ideally the part would be both HW and SW compatible, but clearly SW
compatibility is key!
Does anyone have any experience with this part, repairing boards where
this
part has failed, or other words-of-wisdom to
offer?
Thanks,
paul
The Eastern Block TESLA MHB1012 is also a compatible Part, have a few of
them. There is no SW Compatibility at all since the part is in no way
programmable, every detail is configured trough control signals.
Regards,
Holm
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