12 Jul
2000
12 Jul
'00
2:38 p.m.
I was looking for a source for some Fairchild uL914's (DTL NOR gate)
and came across this:
The Fairchild UL914; DUAL NOR GATE was the ONLY MEMORY and REGISTER
UNIT used in the ENTIRE construction of the ON-BOARD Navigational Computer.
Redundancy and Failure Rates of a NEW Integrated Circuit family (RTL)
dictated the SAFEST possible Design for such an Incredible Mission.
Round 8pin EPOXY package.
4 pieces available $ 99.95 each
Other obscene prices, such as $35 2732's, are to be found at:
http://www.cybertoix.com/page0002.htm
(I can remember when the local Radio Shack had blister-packs of uL914's
for probably $.79 each. I believe they sold a "stack-it-yourself" binary
counter kit that used two uL914's for each bit. Anyone got a Radio Shack
catalog from 1976 or so to check my memory here?)
Tim.
12 Jul
12 Jul
3:30 p.m.
The Fairchild UL914; DUAL NOR GATE was the ONLY
MEMORY and REGISTER
UNIT used in the ENTIRE construction of the ON-BOARD Navigational Computer.
Redundancy and Failure Rates of a NEW Integrated Circuit family (RTL)
dictated the SAFEST possible Design for such an Incredible Mission.
Round 8pin EPOXY package.
4 pieces available $ 99.95 each
Well, it is only out of control is people buy them, and then keep buying
them, and then everyone has them for $99.95. I would not work about it
right now. Even the "hot" chips like 4004s have dropped down quite a bit,
now that every week Ebay has one up for auction.
Do you need a uL914? I have been saving obsolete family chips for years,
and may have a few.
William Donzelli
aw288(a)osfn.org
13 Jul
13 Jul
12:26 a.m.
On Wed, 12 Jul 2000 CLASSICCMP(a)trailing-edge.com wrote:
I was looking for a source for some Fairchild
uL914's (DTL NOR gate)
and came across this:
First off it's an RTL dual NOR gate.
When it was about 1.95 in 1969. since it's 4 transistors and 6 resistors
fabricating one using common silicon transistors and resistors is not
a problem.
dictated the SAFEST possible Design for such an
Incredible Mission.
Round 8pin EPOXY package.
Worst reliability of any package I've ever seen.
(I can remember when the local Radio Shack had
blister-packs of uL914's
for probably $.79 each. I believe they sold a "stack-it-yourself" binary
counter kit that used two uL914's for each bit. Anyone got a Radio Shack
catalog from 1976 or so to check my memory here?)
Don't remember the counter but one using RTL used 790p (dual JK FF).
Doing it with 914s was the hard way. Part of the 9xx family included a
buffer/driver(900), JK-FF (923), half adder (903), and several otehr
functions all very cheap in 1970. Moto offered mWRTL aka MC7xx in 14 pin
DIL Package and that included hexinverter, dual jk FF (790p), quad NOR and
an assortment of other building blocks.
FYI these RTL were nominally 3.0 or 3.6V and not low power for the amount
of logic offered.
I still have a large assortment of these as they were good as linear up to
about 3-8mhz and cheap.
Allison
14 Jul
14 Jul
6:19 a.m.
New subject: Classic Mac Find
I picked up a couple of macs at a Goodwill store a couple of days ago and
found a connector with
them that im not sure what it is and wanted to see if anyone on here might
know what it is.
The items I picked up were
Performa 637cd
Quadra 660av
15" Multiscan Monitor
Modem
2 Keyboards
1 mouse
and this connector has the following config at the open end it has 5 rows of
very small female connectors
at the other end it has 4 wires, one is a video connector, one is a
keyboard/mouse and a speaker and mic connector.
Can anyone tell me what this is?
Also I was able to get this all for 25$ The 637cd works great but haven't
been able to test the
660av since I need a special connector to get it to work with this monitor.
Also if anyone has a connector to hook this monitor up to the 660av please
let me know.
Thanks
Jim
6:52 a.m.
New subject: Classic Mac Find
Performa 637cd
Quadra 660av
15" Multiscan Monitor
Modem
2 Keyboards
1 mouse
and this connector has the following config at the open end it has 5 rows of
very small female connectors
at the other end it has 4 wires, one is a video connector, one is a
keyboard/mouse and a speaker and mic connector.
Can anyone tell me what this is?
Also I was able to get this all for 25$ The 637cd works great but haven't
been able to test the
660av since I need a special connector to get it to work with this monitor.
Also if anyone has a connector to hook this monitor up to the 660av please
The weird thing is a HDI45 AudioVision monitor adapter. The AudioVision
monitors have the matching connector and plug directly into the onboard
video of the 61/71/8100 nubus powermacs, but nothing else without this
adapter.
The 637 and 660av should both have regular mac DB15 video ports, the 660av
also has some "tv" video ports, but unless those configured to be used I
think the default is the normal DB15.
4:57 p.m.
New subject: I love auction junk lots
Nice auction the other day, only slightly making up for my trip to San Jose
getting dumped ("maybe" about 8/2 I try again). Crazy people paying too
much for old PCs etc etc., but right in the middle was a lot of mixed junk.
I love mixed boxes of junk, got the bid for $20.
Naturally the goodie I wanted near the top wasn't what I thought (Radio
Shack regular power strip vs the active controlled strip), but the box was
very good. Maybe 30 10bt ISA cards, 3 or 4 10/100, and 3 or 4 PCI. A layer
of external and internal 14.4k modems, half a dozen 28.8k externals, cables
cables cables, then in the very bottom a Exabyte 8505 XLE. No idea if it
works, but looks nice.
8:52 a.m.
New subject: Classic Mac Find
At 02:19 PM 7/14/2000 -0400, you wrote:
Also I was able to get this all for 25$ The 637cd works
great but haven't
been able to test the
660av since I need a special connector to get it to work with this monitor.
Also if anyone has a connector to hook this monitor up to the 660av please
let me know.
Thanks
Jim
I recently bought a " Mac/VGA Adapter block DB15M to
HDDB15F w/dipswitch" ( Belkin F3H1381) from Onvia.com. It is supposed to
work with a wide variety of Macs.
Regards
Charlie Fox
Charles E. Fox
Chas E. Fox Video Productions
793 Argyle Rd. Windsor N8Y 3J8 Ont. Canada
email foxvideo(a)wincom.net
Check out "The Old Walkerville Virtual Museum" at
http://www.skyboom.com/foxvideo and
Camcorder Kindergarten at http://www.chasfoxvideo.com
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allisonp＠world.std.com -
aw288＠osfn.org -
CLASSICCMP＠trailing-edge.com -
foxvideo＠wincom.net -
jimoaks＠one.net -
mikeford＠socal.rr.com