22 Mar
2000
22 Mar
'00
11:04 a.m.
On Mar 22, 23:56, Tony Duell wrote:
You _honestly_ think that a 22V10 (or whatever) is
simpler, cheaper, and
easier to use than a couple of 74LS20s? You know, a 22V10 has 24 pins,
and the 2 74LS20s have 28. That's only 4 more pins to solder. And there's
no requirement to program a chip if you use the '20s.
No, but I can make more choices with the 22V10 -- I want to be able to
switch ROM sets (between the original on the motherboard and possibly two
on the expansion) and RAM sizes and that would need a little more effort
with the TTL, because I want to *replace* the 74154, not add to it.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York