On 8/23/21 3:29 PM, shad via cctech wrote:
Hello Rob,
FreeCAD is nice for modeling 3D shapes.
For 3D printing, depending on the technology of 3D printer, you need to process
original model to convert compact sections into hollow honeycomb structure, and
add small plastic bars into empty
On 7/30/21 1:02 PM, James Liu via cctech wrote:
Hi,
I have been lurking for a few years, but thought I'd finally speak up
as I just received a 9 track tape purportedly containing the source
code to Schoonschip (https://en.wikipedia.org/wiki/Schoonschip). This
is a 2400' reel recorded at 1600
On 03/03/2021 07:17 AM, Roland via cctech wrote:
Hello everyone,
Does anyone have the Intellec MCS-8 8008 system monitor ROM files?
According to the Intellec MCS-8 manual the System Monitor is contained in five
1702A PROMs.My ROMs have a disk loader, but the disks system is long gone...
Any
On 06/25/2020 05:29 PM, W2HX via cctech wrote:
Does ANYONE have any idea what these 4 wires are connected to and why? And
anyone give any odds about whether these 4 wires will prevent this IDE-SD
converter from working?
Temperature sensor and heater. Undoubtedly for start-up in
extreme
On 06/23/2020 12:05 PM, Roland via cctech wrote:
I found somewhat fascinating pictures in a PDP8 small computer handbook. It is
a KV graphics system. According to the book it was used to design new computer
circuit boards. So I got very curious to that KV system. I found a maintenance
manual
On 06/20/2020 04:20 AM, Peter Van Peborgh via cctech wrote:
Guys,
I now know it is an early CDC board. IT had C*NT*OLDATA on the reverse - how
I missed that must be attributed to old age. (Thanks Doug)
Here are shots of the back: https://photos.app.goo.gl/UPozyBB3zp7XYcP79
Ah, the missing
On 06/18/2020 03:14 PM, Peter Van Peborgh via cctech wrote:
Big transistors are Motorola "180376008".
Those would be "house numbers" in the customer's part
numbering system.
Also, any ideas what the "246 636
B" boxes are, they have four legs?
Most likely pulse transformers. This might be a
On 06/18/2020 03:14 PM, Peter Van Peborgh via cctech wrote:
* "C NT OL DATA" on side B (solder traces).
Sure looks like Control Data, a major manufacturer of
mainframe computers in the 60's and 70's.
And, being all discrete transistors, that would likely be
late 60's.
Jon
On 05/20/2020 10:40 PM, Jay Jaeger via cctech wrote:
On 5/20/2020 9:27 PM, Jon Elson wrote:
Umm, if it can take ALDs, then (maybe with some tweaking) it ought to be
able to do the
same for SLT and MST machines, too! That might get a few more people
interested in the
concept.
Jon
I doubt it
On 05/20/2020 09:21 PM, Jay Jaeger via cctech wrote:
WOW, what a huge effort!
I also spent quite a bit of time generalizing it, so that it will
hopefully be usable (perhaps with some more fixes / enhancements /
generalizing for most any SMS machine (IBM 1620, IBM 709x, IBM 1401 etc.
etc. etc.)
On 05/12/2020 10:36 PM, Bill Degnan via cctech wrote:
Following up on the results of my searching around. The FANUC A860 reader
with A20B controller (the normal set up) has a 50 pin output port. There
is a device one can buy that receives the signal from the FANUC's 50-pin
port and converts to
On 05/12/2020 11:10 AM, Bill Degnan via cctech wrote:
Turns out the "The Director" tape reader I purchased last week was
defective and I got a refund. So I thought I'd try my hand at the FANUC
TAPE READER A860. I may need to make a serial cable (?) to connect from
the internal connector don't
On 04/28/2020 11:01 AM, Bill Degnan via cctech wrote:
Hi - COVID project I have been attempting to read some old Honeywell
DDP-516 papertapes using the OP-80A or Teletype reader but it's inefficient
and I don't want to damage the tapes. Does anyone have a reliable
papertape reader for sale
On 12/20/2019 02:53 PM, Adrian Stoness via cctech wrote:
weird nixdorf is the last name of my boss whos in his 70's engineered lime
plants around north america for what became greymont
No, Nixdorf was a significant player in the computer
business in Europe, especially.
Wikipedia says they
I have about 240 pieces of the national Semiconductor
MM5262N 2K x 1 DRAM chips.
They appear to be unused, in aluminum (not plastic) tubes.
Chips are plastic packaged.
365 ns access time, 475 ns read cycle.
Anybody need them to fix an old computer?
Jon
I have 400 pieces of Signetics 10144L ECL static RAM chips.
Anybody need some?
These were salvaged from boards by a surplus dealer
(Alltronics, I think).
They are a 256 X 1 bit RAM, somewhere around 20 ns access
time, ceramic package.
Jon
On 10/02/2019 12:18 PM, Dennis Grevenstein via cctech wrote:
Hi,
Jon wrote:
I have 15 pieces of memory SIMMs for the Challenge M series
(funny, seems like there should be an even #). Pics here :
http://pico-systems.com/images/SGIChallenge.JPG
A Challenge M is basically a server variant of
On 08/11/2019 08:00 PM, Douglas Taylor via cctech wrote:
This is where the electrical engineer could help. How do
you determine how long a cable the 74LS240 can drive?
Well, there are several considerations. First, it takes
some current to charge up the cable capacitance. More
current
On 08/11/2019 11:11 AM, W2HX via cctech wrote:
I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.
Or differential pairs.
No, both Pertec unformatted and Pertec formatted interfaces
were TTL single-ended.
On 08/09/2019 11:05 PM, Douglas Taylor via cctech wrote:
I have a question about cable length - any electrical
engineers in the house?
Connected a Qualstar 1260 tape drive to an Emulex TC02
qbus tape controller in a pdp-11/53. The interface is
pertec with 2 50 pin cables.
When I use a
On 04/29/2019 06:47 AM, allison via cctech wrote:
On 04/28/2019 09:28 PM, Grant Taylor via cctech wrote:
On 4/28/19 6:27 PM, Ray Jewhurst wrote:
I already have a Hobbyist License. I am just interested in
experimenting with different OSes and different versions of OSes.
ACK
I don't know what
On 12/15/2018 11:19 PM, Rod G8DGR via cctech wrote:
However I began to think would it be possible to create a close copy of an 8/e
out of modern parts.
Finally the big one – Omnibus and the connectors its made from. A 3D printing
candidate?
I’m going to autopsy a busted connector and see
On 11/26/2018 09:16 AM, Camiel Vanderhoeven via cctech wrote:
I still have one remaining issue, and that is that when I connect the system to
my network, it works (I can ping both ways), but the OS becomes unstable, and
usually crashes within a few minutes. Perhaps it has a problem with jumbo
On 11/25/2018 08:42 AM, Camiel Vanderhoeven via cctech wrote:
Now that my mousepad problem has been solved, and I have a fully working Ardent
Titan with some interesting software on it – the bundled version of MATLAB, and
BIOGRAF, a molecular modeling application – I decided to make a short
On 07/18/2018 03:15 PM, Johannes Thelen via cctech wrote:
Anyone familiar with these PCMs? I got a CMI 1640 and little help needed.
Here's photos:
https://drive.google.com/drive/folders/1w74AYe6lRSn9gJhyKVlBYAq5zRDWybSw?usp=sharing
What this 370 clone is exactly? If I have understood right,
On 06/02/2018 03:33 PM, Antonio Carlini via cctech wrote:
On 02/06/18 15:17, allison via cctech wrote:
It was my understanding from using the 730 that there was
limited
(really limited) microcode
enough to load the WCS as the tu58 was a serial device
(standard tu58)
and the 730 had to
On 12/03/2017 10:28 AM, Aaron Jackson via cctech wrote:
I'm looking after a VAX 4000 for a friend, which has a SCSI Q-bus card
(M5976). If the card did not have the large metal face, would it work in
a Q-bus PDP-11? We are not going to potentially ruin a card by trying
this, but I am interested
On 11/03/2017 08:52 PM, Brian Walenz via cctech wrote:
Awesome, thanks! I missed that in my scan of the Mouser catalog.
https://www.mouser.com/ProductDetail/TE-Connectivity/1-480270-0/
$0.86 for the connector, $160 for the crimper.
You should be able to use Molex crimping tools with these
On 10/02/2017 08:29 AM, allison via cctech wrote:
It was price... ATA-IDE was cheaper and PC industry was
working hard to push the price down.
SCSI always remained more costly.
Yes. I think there were royalties to pay for a true SCSI
drive. Anyway, there was a VERY significant price
On 06/16/2017 09:31 AM, David Gesswein via cctech wrote:
Can anyone identify these boards? Person I got them from can't remember
anything about them.
http://www.pdp8online.com/ftp/misc/unknown_boards/
Date codes of 1964. Size 4.5"x3.25". Looks like used card edge for
keying but has separate
On 06/07/2017 09:12 AM, william degnan via cctech wrote:
Where there any computers that used a "rectangular sense" core RAM?
Whirlwind core is diagonal. This page describes the differences/evolution
of the sense line.
More: http://ed-thelen.org/comp-hist/Byte/76jul.html
Were rectangular core
On 04/02/2017 07:26 AM, David Griffith via cctech wrote:
That's why I put this in the context of PNP robots rather
than hand-soldering. My last run of P112 boards was 150
and I'm thinking of doing another 150 or maybe 200.
Phew, I sure wouldn't want to hand solder 150 - 200 boards!
Been
On 03/31/2017 11:15 PM, Chuck Guzis via cctech wrote:
I use pretty much the same method, but start off with just
a binocular loupe and then finish with a stereo microscope
for final inspection.
Oh, the trick for this is there are inspection microscopes
with long working distance that allow you
On 03/31/2017 12:55 PM, Jim Brain via cctech wrote:
On 3/31/2017 12:51 PM, allison via cctech wrote:
Is this something that an experienced hand can manually do?
I can verify that it is indeed possible. I lay down
xc95144xl-tq100s all the time with my iron and some flux
and some wick, and I
On 03/31/2017 06:28 PM, allison via cctech wrote:
Is this something that an experienced hand can manually do?
Yes, definitely. 100 lead PQFP is perfectly doable if the lead pitch is not
insanely small. It takes a good fine tip soldering iron (mine is a Weller with
a PTS tip), fine solder
35 matches
Mail list logo
