I doubt that you will ever find a manual or schematics, but you
should be able to decipher enough of the circuitry to figure out how
to fire it up and talk to it. The digits should be arranged in either
a counter or individually addressable. If it's a counter, you should
be able to find a 1 PPS point somewhere in there to make it at least
do that. If there's not a bunch of digital stuff in there - shift
registers and such - then it's probably just a counter of 1 PPS from
an AM modulated carrier, or maybe FSK, or maybe simply divided down
from those frequencies selected on the front panel. If it already
lights up, try putting in some signals and see what it does.
Ed
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