Thanks, Nigel, I think your history description is about right - I
vaguely recall seeing the Rockland brand too. I guess PTS is the
current survivor - the PTS D310 seems quite new, and the company
seems to be still in business in their niche.
Ignacio sent me a pinout page for the PTS 040/160/250, which probably
represents a standard arrangement used for all the models, hopefully
just extended by including more bits for higher frequency units. The
D310 is a dual .1 - 310- MHz type, with two program connectors. Also,
I do recall that they used IEC color codes on the ribbon cables for
convenient tracing of the 8,4,2,1 bits within each BCD digit, so it
should be fairly easy to figure out the details.
Ed
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