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23 votes

Was bootloading from punch cards possible on System/370 machines?

Sorry for the narrative here, but it answers the OP's question directly by personal experience. The text is too long for a comment. "Was bootloading from punch cards possible on System/370 ...
timetraveller's user avatar
22 votes
Accepted

Was bootloading from punch cards possible on System/370 machines?

TL;DR: Yes, a /360 (*1) can boot from any device connected to a channel. A /360 can boot from any device able to answer to a basic read command. Whatever is delivered will be executed. There is no '...
Raffzahn's user avatar
  • 225k
21 votes
Accepted

Did the IBM 1401 have much better code density than the 360?

TL;DR: No. /360 code was usually way more compact for the same task than 1401 code. Partly due to shorter instructions (2..6 Bytes vs 1..8 Char (*1)), partly due to a more capable ISA (use of ...
Raffzahn's user avatar
  • 225k
9 votes

Were punching tools for punch cards with rectangular holes easier to keep sharp than those for round holes?

TL;DR: NO. For one, they are not cookie cutters but punches, second they are hardened steel and very durable and third, if they degrade, they will be simply exchanged - which includes both parts, ...
Raffzahn's user avatar
  • 225k
8 votes

Does anyone have any information on GUTS (Gothenburg University Timesharing System)?

Ingemar Dahlstrand who was running Industridata operations in Gothenburg after the demise of Facit mentions GUTS in his article "The Development of University Computing in Sweden 1965–1985" ...
Linus's user avatar
  • 81
4 votes

Couldn't people just buy mainframes from the same manufacturer and connect them before the arpanet?

I don't understand what they mean by mainframes were stand alone. You left out the a very important restriction of that claim: "In the mid-1960s, mainframe computers in research organizations ...
Raffzahn's user avatar
  • 225k
2 votes

Couldn't people just buy mainframes from the same manufacturer and connect them before the arpanet?

Why go through all that to help scientists share their findings when they can just buy mainframes from the same manufacturer and connect them? That's essentially the whole problem right there -- they ...
Chris Dodd's user avatar
2 votes

Does anyone have any information on GUTS (Gothenburg University Timesharing System)?

It is a very long time ago but I went to Trinity College Dublin from 1969 and used GUTS via their display screens, they had eight 2260s I think. By todays standards the hardware was pathetic, I think ...
David McQuillan's user avatar
2 votes

What did the Big Red Button actually do on the IBM 4341?

The Big Red Switch (which took a bunch of forms) on the IBM System/370s, including the 4341, initiated a power-down of the entire system. There were Emergency Power Off (EPO) cables that were strung ...
Ross Patterson's user avatar
2 votes

When were floating point rounding modes first implemented?

In 1959 George Forsythe proposed a stochastic rounding mode in Forsythe, George E. “Reprint of a Note on Rouding-off Errors.” SIAM Review, vol. 1, no. 1, 1959, pp. 66–67. Noting that "...in the ...
Adam Hyland's user avatar

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