26 Feb
2009
26 Feb
'09
7:22 p.m.
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