11 Apr
2005
11 Apr
'05
7:20 a.m.
Two DEC star coupler panels (removed from SC008 cabinet) with jumper
cables and some terminators, also a box of CI cable -the nice thin kind,
not the evil thick variety.
In NE Wisconsin, needs to be claimed by Friday.
Paul
11 Apr
11 Apr
9:47 a.m.
New subject: Old Chip Info?
I've recently acquired an old Wang 144T programmable electronic calculator.
Early '70's technology. Uses a lot of 7400-series TTL, along with some
older
DTL. It is a microcoded machine, using a Texas Instruments TMS 2600 2K-bit
Mask Programmed ROM for the microcode store. I want to try to capture the
content
of the ROM, but I've not been able to find a pinout and specifications for
it anywhere.
Anyone out there have any old TI databooks that they might find this
old device in? The date codes on all of the parts in the machine
range from 7132 to 7144, so it's all mid-to-late '71 timeframe for
manufacture,
if that helps. According to one reference I found, the chip was introduced
in 1970.
Thanks,
Rick Bensene
The Old Calculator Web Museum
http://oldcalculatormuseum.com
12 Apr
12 Apr
2:30 a.m.
New subject: Old Chip Info?
Rick Bensene wrote:
Anyone out there have any old TI databooks that they
might find this
old device in? The date codes on all of the parts in the machine
range from 7132 to 7144, so it's all mid-to-late '71 timeframe for
manufacture,
if that helps. According to one reference I found, the chip was introduced
in 1970.
I'm not sure if I can help, but I have access to some TI databooks from
late '70s, early '80s. I did have a look and they did not mention your
chip. However, perhaps its helpfull to have the pinout of similar chips,
as they might have identical pinouts.
Bert
11 Apr
11 Apr
11:02 a.m.
On Mon, 11 Apr 2005 09:20:47 -0500 (CDT)
Paul Thompson <pt at new.rr.com> wrote:
also a box of CI cable -the nice thin kind, not the
evil thick
variety.
BTW: CI cables are simple 50 Ohm coax cables. I have a set of
"thin" CI
cables and the cable is ordinary RG58 == Cheapernet-Ethernet cable. The
only difference is that CI cables have TNC connectors where Cheapernet
uses BNC. There are TNC-to-BNC adapters, so if someone need thin CI
cable he / she can reuse old Cheapernet cabling. (The length limit of
this thin cables may be lower then for the thick cables as thin cable
has higher attenuation.)
In NE Wisconsin, needs to be claimed by Friday.
Beyond the Big Pond...
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
11:47 a.m.
>>>> "Jochen" == Jochen Kunz
<jkunz at unixag-kl.fh-kl.de> writes:
Jochen> On Mon, 11 Apr 2005 09:20:47 -0500 (CDT) Paul Thompson
Jochen> <pt at new.rr.com> wrote:
> also a box of CI cable -the nice thin kind, not
the evil thick
> variety.
Jochen> BTW: CI cables are simple 50 Ohm coax cables. I have a set
of
Jochen> "thin" CI cables and the cable is ordinary RG58 ==
Jochen> Cheapernet-Ethernet cable. The only difference is that CI
Jochen> cables have TNC connectors where Cheapernet uses BNC. There
Jochen> are TNC-to-BNC adapters, so if someone need thin CI cable he
Jochen> / she can reuse old Cheapernet cabling. (The length limit of
Jochen> this thin cables may be lower then for the thick cables as
Jochen> thin cable has higher attenuation.)
I didn't know there is any such thing as "thin CI cable". The only CI
cable I've ever seen is medium thick -- halfway between RG58 and RG8,
usually blue, and *very* stiff.
Considering the bandwidth of CI, it's probably rather unforgiving of
cheap cable.
paul
12 Apr
12 Apr
8:38 a.m.
On Mon, 11 Apr 2005 14:47:09 -0400
Paul Koning <pkoning at equallogic.com> wrote:
I didn't know there is any such thing as
"thin CI cable". The only CI
cable I've ever seen is medium thick -- halfway between RG58 and RG8,
usually blue, and *very* stiff.
Would be interresting to get exact speacs for this
big cable.
Considering the bandwidth of CI, it's probably
rather unforgiving of
cheap cable.
My SC08 Users Guide says a Star Coupler has a bandwith of 1 to 100
MHz.
100 MHz is no big problem with RG58, if the cables are not that long.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
7196
days inactive
7197
days old
5 comments
5 participants
participants (5)
-
bert＠brothom.nl -
jkunz＠unixag-kl.fh-kl.de -
pkoning＠equallogic.com -
pt＠new.rr.com -
rickb＠bensene.com