From: Chris Kennedy <chris at mainecoon.com>
  CDC and IBM FEs would periodically get into pissing
contests over who
 was responsible for various faults; recurring ones would end up with a
 piece of paper taped to the channel controller that would say something
 to the effect of "TP XYZ +X volts -> IBM problem, -Y volts -> CDC
 problem".  
Heh, I was with the CDC STAR-100 installation at LLL/LRL.  It was
ALWAYS our problem.   ;(
Sigh,
Chuck