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 on: February 24, 2012, 08:36:32 pm 
Started by Aleksandrs Guba - Last post by bwdevries
I do not have a photo of DC office but just wanted to let you know that the current issue of NCR_REA is now available on line to members. There is a aerial photo of the Dayton complex  that is new to me. I would guess about 1960 or 61.

 on: February 24, 2012, 08:31:20 pm 
Started by eriver - Last post by bwdevries
I agree that the modules are from a compu tronic , The photo just posted is exactly as I remembered seeing them in Grand Rapids Mi when I was an apprentice.  Marv Kloote was the first CE trained on this machine.

 on: February 24, 2012, 12:04:28 pm 
Started by eriver - Last post by wally
Hi Marv, you are right. I found an old picture of the inside of a 441 at ITEC Giessen.
I was probably thinking of a 395 or 400. I found it in this PDF.

At least the module 3 from above seems to be from a 441.

 on: February 24, 2012, 01:43:50 am 
Started by eriver - Last post by Marv
I remember things like 12AS7s…6SN7s…thyratrons…massive cooling fans…165-volt anode voltages...anodes, cathodes and grids. I don't remember any transistors in there. But I could be wrong.

 on: February 08, 2012, 10:21:56 am 
Started by eriver - Last post by wally
Hi Marv,
I'm not the only one, who thinks the Computronic was transistorized.

 on: February 08, 2012, 05:18:37 am 
Started by eriver - Last post by Marv
Hi Wally,
I think you might have the Comp confused with some other system. Your timeframe is correct but the Comp was anything but leading-edge. It used old technology, nothing like the showcase EDP systems of the day.

 on: January 25, 2012, 01:40:12 pm 
Started by Systemind - Last post by terrymoz
The first NCR computer (315-100) I taught in the UK had a 10k memory (slabs) A slab was 12 bits which could consist of two alpha numeric characters or three numeric characters. I later taught the Century 100 which had 16k of memory (bytes). 
The laptop on which I am typing this message has 8Gb of things have progressed!!!!!!

 on: January 21, 2012, 01:48:46 pm 
Started by eriver - Last post by wally
Hi Marv,
if I remember right, the Computronic was transistorized. But I'm not 100% sure.
It came on the market in 1959 and I think by that time transistors were used.
It is the same time, the NCR 304 was introduced and it was the industry's first
all-transistorized, or solid-state computer for general business in the market.
Regards Wally.

 on: January 21, 2012, 05:04:35 am 
Started by eriver - Last post by Marv

I know this is an old topic but, if it still matters, that module you have is from an NCR class 441 Computronic. You can see the part number in one of the views. The Comp was an accounting machine based on a class 31, but with the added capability to multiply electronically. Very spiffy for its time.

The tubes, likely manufactured for NCR, all contained the company logo. Something about being "computer grade" if I recall.

 on: January 15, 2012, 04:45:36 pm 
Started by Aleksandrs Guba - Last post by n8eyh with OCD-WM42 of Hilse
Hi! RogerHallett,

Yes, exactly, the TMX is named by the BAS project team of Mr. David Nanda in E&M Dayton. Originally, the project team of Mr. Jerry Butler in E&M Columbia had modified the VERSADOS realtime OS, which is provided by Motorola,  with attaching several functions for the small controller based on MC68010 MPU which was different from the tower 1632 office systems. The BAS project manager tried to evaluate the availability of the Xenix that Mr. Bill Gates renamed the UNIX. However, E&M Dayton imported the OS architecture of VERSADOS from E&M Columbia into the BAS 5000 system, in order to install this modified VERSADOS through attaching several midleware functions for supporting the application friendliness to assist the transaction processing on the Branch Automation Systems. They called this application friendliness as the TMX (Transaction Management Executive). Originally the VERSADOS had been developed by the Motorola. When I attended the VERSADOS lecture room during a week by the Motorola instructor in the NCR Dayton Sugar camp in April, 1981. I was very surprised by the weight functionality of the VERSADOS comparing with the MTS 8 bits Intel MPU. I suspect that the Motorola strategy would be based on the simple procedure program like the 68xx MPU based application under the multi-tasking MC68010 MPU systems. However, on the other hand, the NCR system engineers might looked at this flexible OS like the versatile B4 executive on the powerful Century 300 processor, without detailed simulation of the performance of the TMX based MC68010 processing.
Although I am not sure the availability of LAN (might be OMNI-Net of NCR, 2Mbps transfer rate during the time), the BAS controller supported the IHDLC high speed communication and also the analog type communication for NCR C-270 and ATM etc.
I suspect that this IHDLC high speed lines would make high rate interruption for MC68010 MPU.
I experienced to discuss much time to make sure the performance of total volume processing for the banking transaction in the Japanese financial market. The product management had been very significant in the BAS development, I studied.
Best regards,

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