2 Oct
2007
2 Oct
'07
6:56 a.m.
Subject: these RTL or what?
From: "Roy J. Tellason" <rtellason at verizon.net>
Date: Tue, 02 Oct 2007 02:01:29 -0400
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
I ran across some data in the pile of what I've been collecting, and there's
some stuff there apparently by Signetics (?) referring to what they're
calling "Utilogic II" -- is this stuff RTL or what? It doesn't say. Dates
are in the late 1960s, and it looks like it, but I figured I'd ask in
here...
There are many early families of saturated logic RTL is the oldest,
DTL and it's kin "utilogic" where the intermediate sorta TTL like
and later TTL( H,LS,S,F,AS,C,HC,HCT flavors). In the middle of all
that was ECL (also about three or four generations) a fast non
saturating logic.
What amazing is when people say "60s" you must do so with care as
1960 was basically germainium transistors but by 1964 silicon
transistors are about and ICs were already appearing. Most
integrated circuit logic was post '65 and even then from that
point speeds went from about 3mhz to 30mhz and RTL was replaced
by TTL by 1970. The evoloutionary scale was very steep from the
mid 50s to the mid 70s. That 20 years window we went from computers
with tubes to microprocessors, delays lines or other serial storage
to semiconductor RAM.
Allison