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
3 Oct
3 Oct
10:38 p.m.
On Tuesday 02 October 2007 09:56, Allison wrote:
Which explains why I was seeing it first, and hobby-type projects based on it
back when.
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).
My first TTL book (which I still have) was a TI book that covered the
standard, H, and L varieties. LS and S I can understand, F and AS still
confuse me a bit, I'm not quite sure where they fit in. Then there are all
those CMOS variants. C parts are pretty uncommon these days, and I'm not
real clear on the distinction between HC and AC (I know about the ones with T
in there, just shifted thresholds on the inputs and I have a pile of 'em.)
In the middle of all that was ECL (also about three or
four generations) a
fast non saturating logic.
I've read some ECL data, but have never done a darn thing with it, nor even
seen much of anything that used it. From what I understand it had some weird
packaging sometimes, very tight board layout requirements (I was mostly
thinking of wire-wrapping stuff), and was very power-hungry. I guess if I
ever want a prescaler for a counter to get *way* up there or maybe one or two
other apps I can think of I might eventually have to go there, depending on
what parts I can find. But I'm in no hurry. :-)
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.
I did say "late 1960s" up there. :-)
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.
I remember seeing some of the boards from the tube stuff for sale in various
electronic junk places around. I may have even got one or two for parts,
though there was nothing to be done with those backplane connectors. I
remember one set of 9-pin sockets for which it was apparent to me that they
were using something like a 12AU7, because of the center-tapped heater
connections. :-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
4 Oct
4 Oct
3:10 p.m.
On 4 Oct 2007 at 1:38, Roy J. Tellason wrote:
And in the 60's, logic families were less well-defined. I still have
some Fairchild 8-bit addressable memories (TO-100 can) whose
datasheet claims DTL as the logic family. +6 for Vcc and...+7vdc for
clock.
On Tuesday 02 October 2007 09:56, Allison wrote:
There are many
early families of saturated logic RTL is the oldest,
Which explains why I was seeing it first, and hobby-type projects based on it
back when. I remember one set of 9-pin sockets for which it was
apparent to me
that they were using something like a 12AU7, because of the
center-tapped heater connections. :-)
I used subminiature tube sockets for my first transistor projects--
they were easier to find than transistor sockets. Some transistors,
such as the 2N109 required the use of sockets--they were too
expensive to solder into a circuit.
Cheers,
Chcuk
6290
days inactive
6292
days old
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