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Best home Mainframe

MrImprovement

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Jan 7, 2023
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Very random thread:

What is the best mainframe (by your justified opinion) what the best mainframe you can have that one might be able to have at home - e.g. while it might be possible that someone has say a 1401/360 or something at home it isn't likely but might have say a PDP8 or something that they picked up and able to maintain at home that doesn't require that they have mega bucks.
It's a pretty wide-ranging question. Is it more that you want to run a weird OS or that you want exotic looking hardware? Do you want to actually use it for more than a few hours each month?
 

acorn_1401

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Mar 1, 2023
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South UK
Totally agree it is a wide ranging question. even just from UK to USA. To be honest it was started when I read the post on here regarding someone having a Bendix G-15 just chilling at home (granted in this case not working but stil). Just thought that that person who used to work at comapny x and they were throwing y away. Just a thought experiment as to what that computer could be.
 

Chuck(G)

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"Of course NOS and NOS 2 are the OSs the majority of sites ran. "

Depends on where you were. Sunnyvale rarely ran KRONOS. I was good friends with Greg Mansfield for quite a few years, even after he left CDC for Cray (I introduced him to the pleasures of gelato; he was another fan of Bill Godbout's gear). Only got to meet Dr. Dave once at ARHOPS. SVLOPS/SSD/CPD was primarily SCOPE, as were the big number-crunching customers. The local COMSOURCE operators knew only SCOPE.

That was not unusual for the East/West divide. On STAR, we on the left coast ran STAR-OS, which was really a product of Lawrence Livermore, while Arden Hills often ran the RED system. Never could figure that out.

Did you know that 7600 SCOPE 2 was supported out of SVLOPS, even though there was no 7600 on site? The PLATO people at SVLOPS were logged into some non-local system also. Lots of weird stuff back then.
 
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Chuck(G)

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Oh, I have stories...what killed CDC in my opinion was the deadwood--the "we've always done it this way" crowd. And there was probably no denser population of that line of thought in CPD. SSD was different, as it operated on the Lockheed business model--you worked with your project. When your project contract ended, it was up to you to find a new project or leave. But CPD had too many lifers--some were really good; e.g. Don Nelson and COBOL. Between projects, I was briefly recruited for the SCOPE design team--and left after about two months out of frustration. "You're rocking the boat" I was told.

When SVLOPS finally cycled down, it hit a lot of people hard. One fellow, who I'd worked with for years, committed suicide.

It was ironic that CDC even existed in the middle of Silicon Valley, which was full of risk-takers and innovators. To its credit, the CDC mafia did go on to form several SV startups, but that was the exception rather than the rule.
 

MykeLawson

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Mar 21, 2014
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I had a love/hate relationship with the IBM Series/1 when I worked for IBM in the 80s and 90s. Cool looking, and did the job, until they didn't. Always seemed to be a card re-seat issue.
1696009368621.jpeg
 

Bruce Tomlin

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San Antonio, TX
Another option might be a small VAX, say an 11/730 or 11/750. Still pretty mainframe-looking.

Do be aware that these old systems do drink a fair amount of lightning-juice, so take that into account. At least you won't have to install a chilled water supply or MG sets.

Biggest question: Are you married? If so, would your wife entertain the competition?
In my university days, there was a 730 (or maybe it was a 750) in an electronics lab. It was a little half-rack thing, or maybe two half-racks. It wasn't even on a raised floor.

One big thing to consider is the power for these things. I seem to recall hearing that a 780 needs 3-phase power, but I don't know about its little brothers. Even in 240v-land, I don't think that residential 3-phase power is very common.
 

MykeLawson

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Mar 21, 2014
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I also had a fully loaded IBM RT/PC 6150 as my office PC. I had a 6091 display and the 6157(?) tape drive. I had whatever the latest flavor of AIX, that I could get my hands on, running on that beast. I forget how much it weighted, but it took a hand truck to move it. The top of that thing was level with my desk. And since I worked for IBM at the time, I had access to whatever the latest gizmo that came out to upgrade the thing. I miss it......
 

Chuck(G)

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11/750 was single-phase 240/208V at somewhere around 20A for a typical configuration. So you can have one in a residence. We got the 750 instead of the 780 mostly on the basis of bang-for-the-buck and lower power requirements. We eventually had to add a second one, so maybe the 780 could have been the right choice. But yeah, far less impressive visually than a PDP 11/70. No blinkenlights nor flippyswitches.
 

littlejackal

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Nov 14, 2023
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I'm always on the look out for one of the smaller IBM MP3000 systems. Fairly reasonable size, though as I dig into the hobby I'm finding more and more people running the bigger Z's too!
 
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