15 May
2001
15 May
'01
12:33 p.m.
From: Sellam Ismail <foo(a)siconic.com>
I think you guys are going to have to use DTL. If TTL
was even around
in
1970, it was probably pretty expensive at first.
It existed in 1970. By 1973 it was widely used. My Yasu Freq counter
(good to 350mhz) was purchased in 73 and contains:
7490 decade counter (usually good to 35mhz then)
7475 quad latch
7441 Decimal decoder and Nixi driver.
7400
7404
74Sxx parts were a year or two later.
Allison