22 Aug
2006
22 Aug
'06
11:50 a.m.
Tony Duell wrote:
There were some very marginal bits of logic design
(hint : a '157 is a
multiplexer, a '175 is a latch, but the MK14 uses the former as a the
display output register. It works for _some_ makes of '157...).
I read somewhere that the MK14 was redesigned by National Semiconductor
so that it used chips made by them, exclusively. This was done for
free, or at least in return for buying lots of Nat Semi chips to
actually build the machines. Maybe the Nat Semi '157s work, and
others don't?
--
John Honniball
coredump at gifford.co.uk