Hi:
There's a quick mod that needs to be done to a non-DEC RD53, ie a
Micropolis 1325. There's a place on the large circuit board for "R6" that
has nothing in that place. Solder a wire between the two R6 terminals and
you have a "real" RD53.
Kevin
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Kevin McQuiggin VE7ZD
mcquiggi(a)sfu.ca