2 Oct
2007
2 Oct
'07
1:38 a.m.
> 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...
Goggle finds only a few hits for utilogic,and is mostly a odd chip I suspect more TTL rather than DTL. Ben.
look under http://bitsavers.org/pdf/signetics/_dataBooks/
2 Oct
2 Oct
10:07 a.m.
On Tuesday 02 October 2007 04:38, Al Kossow wrote:
I don't recall where I picked them up, but what I am referring to is indeed a
couple of databooks... I might have gotten them there, even. Maybe I just
need to dig into them further.
--
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
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...
Goggle finds only a few hits for utilogic,and is mostly a odd chip for
sale. I suspect more TTL rather than DTL. Ben.
look under http://bitsavers.org/pdf/signetics/_dataBooks/ 
12:37 p.m.
"Roy J. Tellason" wrote:
On Tuesday 02 October 2007 04:38, Al Kossow wrote:
I don't recall where I picked them up, but what I am referring to is indeed a
couple of databooks... I might have gotten them there, even. Maybe I just
need to dig into them further.
"UtilLogicII_Handbook_1968.pdf" from Al's bitsavers presents some internal
schematics.
Kind of interesting in that the family is a mixture of technologies: AND gate
inputs are current-*sinking* multi-emitter TTL style, N/OR gates inputs are
current-*sourcing* like RTL with a common limiting resistor but referred to in
the text as DTL with the diodes replaced with transistors. N/OR outputs are
totem-pole so they'll both source and sink current. AND gate outputs only have
a high-side transistor so they'll only source. If one stuck to AND-OR-NOT
combinatorics it was probably OK to design with.
I came across a small pile of unknown 60s-era SSI gold-ceramic ICs recently
(SG 2xx series) and popped the lid off one just for fun to see if I could
figure out what it was under a microscope (looks like a dual 4-input TTL or
DTL gate), then later found some mention of them in the cross-refs of an early
TI TTL databook.
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...
Goggle finds only a few hits for utilogic,and is mostly a odd chip for
sale. I suspect more TTL rather than DTL. Ben.
look under http://bitsavers.org/pdf/signetics/_dataBooks/
3 Oct
3 Oct
9:29 p.m.
On Tuesday 02 October 2007 15:37, Brent Hilpert wrote:
"Roy J. Tellason" wrote:
I'm not 100% certain without going and looking, but I believe that's one of
the files I have on hand here...
On Tuesday 02 October 2007 04:38, Al Kossow
wrote:
I don't recall where I picked them up, but what I am referring to is
indeed a couple of databooks... I might have gotten them there, even.
Maybe I just need to dig into them further.
"UtilLogicII_Handbook_1968.pdf" > 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...
>
Goggle finds only a few hits for utilogic,and is mostly a odd chip
for sale.
I suspect more TTL rather than DTL. Ben.
look under http://bitsavers.org/pdf/signetics/_dataBooks/ from Al's bitsavers presents some internal
schematics. Kind of interesting
in that the family is a mixture of technologies: AND gate inputs are
current-*sinking* multi-emitter TTL style, N/OR gates inputs are
current-*sourcing* like RTL with a common limiting resistor but referred to
in the text as DTL with the diodes replaced with transistors. N/OR outputs
are totem-pole so they'll both source and sink current. AND gate outputs
only have a high-side transistor so they'll only source. If one stuck to
AND-OR-NOT combinatorics it was probably OK to design with.
No wonder I'm having trouble figuring out what I'm looking at. :-)
I came across a small pile of unknown 60s-era SSI
gold-ceramic ICs recently
(SG 2xx series) and popped the lid off one just for fun to see if I could
figure out what it was under a microscope (looks like a dual 4-input TTL or
DTL gate), then later found some mention of them in the cross-refs of an
early TI TTL databook.
Yeah, those cross-reference tables are another area where I might be able to
glean some useful info, it appears, as there are numbers there (including
some like the one you mention) that I don't remember seeing anywhere else.
--
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
6289
days inactive
6291
days old
3 comments
3 participants
participants (3)
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aek＠bitsavers.org -
hilpert＠cs.ubc.ca -
rtellason＠verizon.net