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News: On Feb 04, 2015 we celebrated the 10th anniversary of the site and The Core Memory Project!
My sincere greetings to all contributors,- we did it together!

Aleksandrs Guba
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 on: November 26, 2015, 08:08:40 pm 
Started by Somebody - Last post by donowens
My memory indeed failed me again! The 308 I mentioned before is actually a 310!

 on: November 26, 2015, 05:35:09 pm 
Started by Somebody - Last post by donowens
I started working on the 315 as an apprentice in Indianapolis. In January, I was sent to service the 315 at the Indiana National Bank, reporting to Frank Murphy. He had me working on the CRAM units from day one, but I also assisted with service on the rest of the system before long. In addition to the Indiana National, we also had Merchants National Bank. Between the two site, there were seven Cram units, all my responsibility to service.

In September, I was sent to Dayton for training on the 315, finishing in May 1964. During this time, I received a transfer offer as a Technical Writer for the 353 family and was sent to Hawthorne. It was there I met Jim Taylor, better known to this forum as JimT. I wrote the service and parts manuals for the 353-2 unit. I also wrote manuals for the 420-2.

A side note about the 315 photos in the Gallery - the fourth picture from the end is not related to the 315, it is a 308 (if my memory is right), which NCR oem'ed from either 3M or CDC. It was an octal base machine rather than hexadecimal, and only had paper tape, at least the one I worked on. For some reason, I remember I received a routine to be used for debug and had to key the whole thing in as octal characters - big pain.

 on: November 17, 2015, 03:12:49 pm 
Started by Chris - Last post by Russ_Bartlett
  The reply to aptitude question #7  is incorrect.  Let me break this question down:
1.   None of the boxes contain numbers therefore the contents are irrelevant to a point however,  content of box 6 being the exception!
2.   Box 7 is a distraction.
3.   The process steps are about iteration - 
a.   At step number 5 the box number is increased by 1 (stop after 4 iterations)
b.   At step 6 the box number is decreased by 1 (stop after 3 iterations)
4.   The decision test to stop iterations is at step 3 therefore we can immediately jump to this step with the pointer for box number set at 5 (we have done 4 iterations up and 3 down to 9)
5.   So the question now is the second box number mentioned in instruction 2 (now 5) less than the number in box 6.  If we make the number in box 6 = a value of 5 we   will go to “END” which is exactly what we want to do as we don’t want another iteration!
6.   Box 6 could in fact contain any value greater than 5 to cause the process to terminate but as the question states “in order to accomplish this no more no less”  I’m saying 5 is the correct answer.

 on: October 11, 2015, 01:10:22 am 
Started by heikobuss - Last post by heikobuss

a collegue from NCR Hamburg (Germany) had to fix a funny fault on a Century-100.

Everytime when a Program selects the Magtape, the ME-Light (Memory-Error) on the Console turns on, and the System stops.

You remember: When executing an INOUT-Command, the A-Adress of the Command points to the PAF-Characters needed.

The Trunk/IO-Logic then sends all the needed PAF-Characters (Trunk/Position, Function, etc.) to the Peripheral. When all necessary Characters are send, the Peripheral (or, in this case, the Magtape-Controller) raises the "End-of-Control-Information"-Line on the trunk, and the IO-Function starts.

But the Controller failed to raise this line, and so many PAF-Characters where send to the Controller until the "end of memory" in the processor was reached, and the "LGM"-Term ("L-Register greater memory") was raised, and the ME-Light on the Console  turns on ....

The reason was a faulty NCR80-Chip in the Magtape-Controller. My collegue hat to replace this chip, and everybody was happy .....

Fascinating memorys - that was the time you had to know what to do!

All the best

 on: August 30, 2015, 06:22:24 pm 
Started by heikobuss - Last post by heikobuss

Hello to all,

I open this thread to invite all the former Century Field Engineers around the world.

Let's talk about the hardware of this nice machine - the last NCR-Mainframe where Field Engineers are trained on very extensiv, very close, very long and down to chip level. The next mainframe-generation training just goes mainly down to board level (board swapping).

Let's talk about the internals and architecture of the Century processor and the peripherals. Let's tell all the interesting, sometimes exciting or funny stories we experienced at the customers site during fault finding and repair!

I remember the LA- and LB-Registers. I remember stepping throug N-Flows and P-Counts via the Microstep-Switch on the Console.
I remember in the processor the K1-Latch - the "miscellaneous decision latch"! This latch was driven by really a lot important Terms!

When processing an I/O-Command (hex "70") I remember the trunk terms "JCSEL" and "JCSIP" (and others) and the PAF and the "control words" (hex 04xx).

I remember the  "Between-commands-testing" (BCT) after each processed command.

I remember loading the Bootstrap Card into the Address "00A0", "ACT", "LOAD" - and things began to move ....

And - of course - I remember the head crashes on the 655 Disk - then cleaning everything,changing the head, mounting the alignment pack, aligning the heads ....

The 657 Disk has really rare head problems - but the Actuator was oil-driven - and sometimes the diaphragm breaks ....

657 Disk: I remember installing the PERK-Feature on a century 200 - this speeds up the trunk to operate the 657 in high density mode (1322 Bytes/sector). What a lot of wirewrap work ....

And, and, and ...

Please join and tell all the storys from your work at the front!

Kind regards

 on: February 23, 2015, 05:29:00 pm 
Started by n8eyh with OCD-WM42 of Hilse - Last post by n8eyh with OCD-WM42 of Hilse
Dear Wally,

  I appreciate your kind advise with a nice ham-shack corner photo.
I could find the Heathkit Antenna Tuner, Daiwa Antenna Tuner CNA 1001, and IC-710A.
Because recently I got them from Japanese Yahoo auction, too,  and got Collins HF-2050 receiver that had designed as the original 1st version of SDR during early 1980s.
Unfortunately, I am still now preparing to restart my radio hobby again since my moving to Nara from Yokohama.
Some day, I am sure to communicate with you in Germany, through wireless method.
Best regards, Katsuhiko

 on: February 20, 2015, 02:16:41 pm 
Started by n8eyh with OCD-WM42 of Hilse - Last post by wally
Hi Katsuhiko,
my active time in Ham-Radio was in the 1980s in Bermuda. I used to have an Icom 720A.
Sorry I don't know anybody, who has information on an IC-700T.
Best regards, Wally.

Here you can find more info on the IC-700T

Here is an old pic of my ham-shack.

 on: February 20, 2015, 04:31:08 am 
Started by n8eyh with OCD-WM42 of Hilse - Last post by n8eyh with OCD-WM42 of Hilse
Hi, from Japan.
 I appreciate your introducing notes of activities in Germany.

 I have an asking whether or not you can confirm your colleagues who are Ham Radio hobbyists have any information of a old transmitter 'IC-700T' manufactured by ICOM, Japan. Because I am looking for it.

 Recently from Germany I got a vintage analog-type receiver 'IC-700R' manufactured for Germany by ICOM in June, 1969, when I was a trainee as a junior systems analyst in NCR-Japan, Tokyo. As my memorial radios in 1969, I would like to set up a pair of receiver and tranmitter on my desk.

 Will you please let me know your idea?
Best regards,
Katsuhiko Hirai, exNCR software engineer.

 on: February 04, 2015, 01:00:25 pm 
Started by Aleksandrs Guba - Last post by wally
Happy Birthday "The Core Memory Project"!
Well done Aleksandrs!

 on: February 04, 2015, 09:03:36 am 
Started by Aleksandrs Guba - Last post by heikobuss

Hello Aleks,

my Congratulation for the 10th anniversary of the The Core Memory Project!

I did'n find too much information about NCR in the Net - for IBM and others you will find a lot. But you collected over the years piece for piece a really lot of interesting information about our former company and its products.

"The Core Memory Project" shows what a great producer of sophisticated hard- and software the company was - worldwide!

You did a great work - thanks a lot and again - my Congratulation!

All the Best

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