Yep,  the problem follows the interface board.   Utterly baffling...  there is 
really nothing to go wrong.  Signals buzz out correctly cable end-to-cable end. 
 I replaced the DIN connectors.  All components measure correctly.  I don't 
remember the values, but the diodes are standard 1N4148's used as overshoot 
clamps.  R's and C's are nothing special.

The 16700 series systems work fine with every PS/2 keyboard and mouse I have 
ever connected.  I have a fully configured 16702B in the shop...  seldom use 
it.   I much prefer the 16500B because it boots in 15 seconds compared to 
minutes on the 16500C and 16700 series machines.

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