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Questions tagged [ibm360]

Questions regarding the IBM System/360 computers and their descendants.

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3 votes
2 answers

How can the current date be accessed from DOS/VS assembler?

In assembler on an old /370-125 running DOS/VS I can access the TOD (Time of day) with GETIME, i.e. the time since midnight. But I want to be able to print the date.
monok's user avatar
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11 votes
1 answer

The MAC-360 programming language developed in the mid 1960s

On SE Space Exploration, one of the answers to this question, Fortran and the Apollo 11 mission states that the MAC-360 language, developed around 1967 by Hal Laning, was used to do develop ...
Fred's user avatar
  • 568
10 votes
2 answers

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

Gothenburg Universities Computer Centre (in Sweden) developed a timesharing system for IBM mainframes, known as GUTS (variously expanded either as ''Gothenburg University Timesharing System'', or as ''...
Simon Kissane's user avatar
9 votes
1 answer

Weird example code for CALL/360:BASIC

The CALL/360:BASIC manual has a couple of simple examples of file I/O. This one has me scratching my head: 10 OPEN 10, 'ITEMFILE', INPUT 20 GET 10: A$,A,B,C,D 30 LET Al = (A+B+C+D)/4 40 PRINT USING ...
Maury Markowitz's user avatar
7 votes
1 answer

Why did IBM skip "System/380" as a mainframe family name?

I've been reading Exhibit 14971 from US vs. IBM (Parts 1, 2, 3) which seems to give a very good overview of the history of the computer industry up to 1980, particularly the way IBM handled its ...
Wildcat Matt's user avatar
2 votes
1 answer

Did the IBM 7030 "Stretch" influence the design of PL/I?

The IBM 7030's fixed-point arithmetic model was unusual: binary numbers could have any number of bits from 1-64. Similarly, PL/I's FIXED BINARY data type has a variable number of bits. On the other ...
John Doty's user avatar
  • 1,321
22 votes
3 answers

What was the rationale behind 32-bit computer architectures?

Though today various power-of-2 word sizes seems to be the norm, back in the 50-60s multiple-of-6 word sizes was more popular and was required by Department of Defense(DOD) in particular. 36-bit ...
Schezuk's user avatar
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21 votes
17 answers

Were any IBM mainframes ever run multiuser?

Now of course there is a sense in which they were – some mainframe installations supported thousands of users! But there is a distinction. Consider the familiar fixture in so many 80s computer science ...
rwallace's user avatar
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5 votes
2 answers

Were there "higher level programming" macro packages for the IBM Macro Assembler?

The IBM/360 Macro Assembly language was quite powerful, allowing non-trivial compile-time string manipulation. Did macro packages exist which would facilitate programming at a (slightly) higher level, ...
Leo B.'s user avatar
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5 votes
2 answers

Any informations on IBM's "Generalized Information System" still available?

I wonder if anyone has documentation left on this topic. In the early 80's, I used to be a 3270 terminal operator, and I wrote programs with GIS. I remember that this language was rather mighty but ...
Andreas's user avatar
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13 votes
5 answers

When did IBM start to use ASCII?

I’m trying to figure out when IBM switched to ASCII and when ASCII became a worldwide standard. Moreover, did IBM make ASCII standard worldwide? What I have found: According to Wikipedia, IBM System /...
No Name QA's user avatar
2 votes
3 answers

Why did IBM System 360 have byte addressable RAM

According to wiki IBM System 360 had byte addressable RAM. Previously IBM had machine with word addressable memory. Did they make a switch for comparability between different machines? Or it was just ...
No Name QA's user avatar
5 votes
3 answers

Why did IBM System /360 have byte addressable RAM, but didn't have 8 bits registers

According to wiki IBM System /360 had only 32 and 64-bits registers for data. I'm wondering if they used 8-bits symbol it means that they stored it in a 32-bits register. Did they have any performance ...
No Name QA's user avatar
3 votes
2 answers

Why did IBM 7030 or IBM 360 use byte and word addressing simultaneously

In 1950s machines had a 36 bit words. And in this word we could pack symbols using 6 bits. And to fetch this symbols from the word programmer should do it using bit manipulations. In 1961 IBM released ...
No Name QA's user avatar
8 votes
4 answers

How was the APL character set represented on IBM mainframes?

The APL language used a unique set of characters, and additionally allowed overstriking of some characters on the terminal to form characters that were used in the language. When an APL workspace was ...
Jeff Zeitlin's user avatar
  • 1,300
2 votes
0 answers

When and with which system or software was IBM's system of tape headers (VOLx, HDRx, ...) introduced?

Background: IBM compatible tape structure (*1) consists of a series of label blocks describing the volume and each file (Data Set). Essential the structure looks like this: VOL1..9 Volume header ...
Raffzahn's user avatar
  • 199k