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Questions tagged [ibm360]

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

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2 votes
2 answers
222 views

What is the full name of IBM CP-67/CMS' DUMPD command?

I am reading the User Guide of CP-67. Under the command DUMPD (page 373), it describes its Purpose as: The DUMPD command prints the contents of one direct-access record, specified by a CCHHRR address,...
12 votes
4 answers
653 views

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 ''...
17 votes
2 answers
4k views

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

I have been idly looking into how System 370 works, though mostly at software and VM/370 OS. As a part of the system generation process, one needs to use DMKDDR utility and others. So I was curious ...
9 votes
1 answer
534 views

How did the OS/360 link editor achieve overlay structuring at linkage time without annotations in the source code?

The OS/360 link editor was, according to Brooks (OS/360 project manager): "one of the finest overlay facilities ever built." "It allows overlay structuring to be done externally, at ...
5 votes
0 answers
359 views

Did the Soviets need industrial espionage to get IBM software pre-1970?

Due to lack of the OS-level file system on the BESM-6, and to deficiencies of data visualization tools which could help people decide which blocks of a system disk could be reused (the line of ...
10 votes
1 answer
1k views

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

Reading an old thread https://groups.google.com/g/alt.folklore.computers/c/53C2adEQ5jE I see a surprising claim: I told an IBM salesman once that IBM had so bollixed up the architecture that our ...
8 votes
2 answers
1k views

How did the IBM 360 detect memory errors?

What logic did the IBM 360 use to detect, and perhaps correct, memory bit errors?
3 votes
2 answers
323 views

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.
11 votes
1 answer
577 views

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 ...
5 votes
2 answers
267 views

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 ...
9 votes
1 answer
291 views

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 ...
9 votes
1 answer
783 views

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 ...
8 votes
4 answers
786 views

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 ...
2 votes
1 answer
170 views

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 ...
21 votes
3 answers
8k views

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 ...
21 votes
17 answers
5k views

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 ...
5 votes
2 answers
538 views

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, ...
13 votes
5 answers
4k views

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 /...
1 vote
3 answers
533 views

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 ...
5 votes
3 answers
1k views

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 ...
3 votes
2 answers
1k views

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 ...
2 votes
0 answers
110 views

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 ...