1" paper tape buy ?

[Dennis Boone]

 > No, but it's generally a CPU program that initiates a punch job. So
 > 60-bits = 5 columns in column binary, which fits nicely.  I don't even
 > remember the name of the CIO overlay that drives the 415.  Thing was
 > noisy and prone to trouble so few people used it.  I do remember the
 > nice warm feel of a deck of freshly-punched cards, though.

Actually, that reminds me...

I always assumed the 12-60 relationship existed because the 12-bit
architecture derived from a previous CDC design, and because it was
somewhere between helpful and important that they be a multiple.

But I haven't run into anything that talks about it.  Anyone have a
reference I should have RTFMed by now?

De