Questions tagged [ibm]
For questions regarding the products of IBM, International Business Machines.
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What is the operating frequency of the 8085 in the System/23 Datamaster computer?
What should be the frequency read at pin 1 of the CPU of this IBM computer?
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Repairing an Old CRT Monitor (IBM 5153)
I acquired a used IBM 5153 monitor. The model number is 5153002. It was manufactured in Taiwan and supports AC100-250V.
When I first powered it on, the monitor turned on, but nothing appeared on the ...
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Was the single-level store (SLS) really a breakthrough?
I am reading Pugh's book on IBM, specifically the section on Future Systems (FS).
There were two key concepts in FS: high-level language support (HLS), and a single-level store (SLS). Both were ...
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What's the earliest source for the legend of Gary Kildall's airplane snub?
A commonly repeated (and commonly debunked) legend describes how Gary Kildall blew his chance at writing the operating system for the IBM PC. Examples include the following:
…legend has it that ...
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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,...
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Coronet and Coronet II benchmarks?
I'm reading about the IBM ASC project, and I see repeated references to a benchmark known as Coronet and/or Coronet II.
Does anyone know what this did?
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How to treat an old PC
I have an old IBM PS/2 30/286, now sitting for a while on one of my desks.
I'm a bit afraid that it will stop working sooner or later, so what's the best way to keep it 'alive' ?
I fire it up every ...
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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 ...
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PC DOS E Editor (3.13v): "Not enough memory" error with a file of 1.65 MB and 40 320 lines, even with the /S switch
Using the E editor included with IBM PC DOS 7, I can't open a particular plain text file without encountering a "Not enough memory" error. The editor was invoked with the /S switch to make ...
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What did a "blue-and-gray sheet of IBM printout paper" actually look like, circa 1994?
Scientific American's December 1, 2023 The Most Shocking Discovery in Astrophysics Is 25 Years Old outlines the "origin story" for the concept of dark energy, a term used to refer to an ...
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System/3: Accessing compilers from tape [closed]
I started getting into playing with the IBM System/3 emulator from simh, and found this tape - looking at the listing it looks like there's a COBOL and RPG II compiler on that tape. What would be the ...
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IBM RS/6000 Token Ring ISA card not operational
After solving a configuration challenge, the ISA Token Ring adapter in my RS/6000 is still not connected to the ring.
Extract from errpt -a:
LABEL: NONE
IDENTIFIER: 0118D2D0
Date/Time: ...
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IBM RS/6000 Token Ring ISA card fails configuration
The system at hand is a RS/6000 7248-100, running AIX 4.3.3.
My quest is to get a Token Ring ISA card to work. The card is a 2971 as called for by the docs.
SMS is happy with the card. I've set the ...
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What was the hardware-level data format on IBM 1316 or 2316 disk packs?
A description of the hardware-level track format of the IBM media used on the BESM-6 I've found is as follows (translated by Google with minimal corrections):
Track header structure:
...
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Documentation for the SALUT preprocessor of the IBM Macro Assembler 2.0
The IBM Macro Assembler 2.0 included the SALUT program, which was a preprocessor for assembly language for structured programming. It was also included in the IBM Macro Assembler/2.
I am looking for ...
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Were punching tools for punch cards with rectangular holes easier to keep sharp than those for round holes?
There is a question here on retrocomputing if round punch card holes where mechanically stiffer:
Were round punchcard holes mechanically stiffer?
I wondered if the reason for the rectangular holes on ...
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Did the IBM ServiceFree really reach 80 MIPS in 1975?
According to Computer Wars by Charles H Ferguson and Charles R Morris, page 40-41, an IBM researcher named Cocke in the early 70s built a RISC minicomputer called the ServiceFree (because it was meant ...
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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 ...
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How to use thinkpad x230 with PCjr 4863 monitor?
I understand it is probably more trouble than it is worth, but I am keen on using my 4863 IBM monitor as a second display for my x230. So far I've looked into converting its VGA signal to a CGA output,...
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Timeline for PowerPC CPUs from various manufacturers
I am trying to assemble a timeline of PowerPC series processors. It is complicated by the fact that there were multiple manufacturers.
So far I have:
IBM POWER
1990 POWER1
1992 RSC
1993 POWER2
1998 ...
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How can I prevent unwanted key repeat when using PS/2 keyboard with USB adapter?
I'm currently using an IBM Model M keyboard with a PS/2-to-USB active adapter. When I type fast on my main PC, almost any key will get "stuck" and keeps repeating until I press another key.
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How small a punched card or punched tape batch job could be?
A while ago I read a post about creating the smallest possible ELF executable doing something observable — printing the number 42, for example — which Linux could accept and execute successfuly. The ...
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History of High Availability in the mainframe and minicomputer eras?
When tracing the source of High Availability, I found to my surprise it led to a company named Tandem Computers which since 1974 made a series of minicomputers called NonStop system, to my surprise ...
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IMPI Instruction set: is there any reference?
I've had an IBM 9404 B-10 for some time and I'm curious about its assembly language. I'm fully aware the AS lines were designed with portability in mind as much IBM didn't seem to provide assembly ...
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What series of AS/400 is the 9406 F2?
I am considering the acquisition of an old IBM AS/400 midrange computer. The provider has stated the model is "9406 F2".
I have dived into the AS/400 information provided by IBM in their own ...
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Information about a VGA card named PC-601170-R2
This card is made by Colorgraphic Communications in 1988, and has two VGA ports, and works well with a 80486 computer.
I tried to used that with IBM 5150 and other XT clones, but I failed. According ...
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Towards people who were there, what programs did you use to develop applications for the IBM 5150?
I want to get into programming on old MS-DOS systems, before then going to older DOSs like CP/M. However, while programming for MS-DOS I'd like to also use era-appropriate software, both for the ...
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How many additions per second (or, generally, instructions per second) could the IBM System370 Model 115 perform?
I can find a lot of information about that model's memory access time, but not so much about its actual computational speed. I'm interested in the number of additions per second if possible, but I'll ...
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What is IBM DCF (Document Composition Facility) used for today?
I am scanning the 1986 manual of HDCF/3 (5748-XX9), the Hebrew version of IBM's Document Composition Facility (DCF).
When Googling to find about the software, I see that IBM still sells this software. ...
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What date is 74029 on an IBM Mainframe?
I have an old printout of a Fortran code.
It's a simple code intended for educational purposes.
The header is:
FORTRAN IV G LEVEL 21, MAIN, DATE=74029, 15/28/03, PAGE 001
I assume it's from an IBM ...
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Does Intel Inboard 386/PC work on XT clone systems?
I don't have an Intel Inboard 386/PC, but I have a plan to buy it in the future. When I read its manual, there was no support for XT clones.
It says:
Install the Inboard 386/PC only in the computers ...
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What's the story behind IBM's SKU numbers?
Big Blue IBM seemingly since forever is using a fixed numbering scheme for all their parts, where every little thing, dingus and gizmo is labeled with the so-called IBM SKU#. It's always in the form:
...
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Which keyboard replaced the IBM Model M?
Setting aside the fact that the Model M keyboard is still made by Unicomp, which keyboard did IBM market as the successor to their Model M (aka "Enhanced") keyboard? My understanding is that ...
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How can I resolve these intermittent memory issues?
I own a 1999 IBM Personal Computer 300GL (Type 6275-90U). It's a Slot 1 Pentium III, Intel 440BX chipset, with a riser board for adding PCI and ISA cards and 3 PC100 DIMM memory sockets.
About 50% of ...
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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 ...
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How did reserve tracks work on early hard disks?
The Wikipedia article History of IBM magnetic disk drives describes the details of the IBM 2311 device, introduced in 1964, as
The 2311 stores 7.25 megabytes on a single removable IBM 1316 disk pack. ...
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What did the Big Red Button actually do on the IBM 4341? [duplicate]
Wiktionary explains the origin of the term molly guard:
Originally a Plexiglas cover improvised for the Big Red Switch on an IBM 4341 mainframe after a programmer's toddler daughter (named Molly) ...
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What was the use case for the 96-column punch cards introduced with the IBM System/3?
Shown here at the Computer History Museum site (*)
Not sure when they were introduced but it was before optical scanning (barcodes) was possible / affordable, maybe even before magnetic stripe ...
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Why did IBM want to keep ICL alive?
According to https://en.wikipedia.org/wiki/International_Computers_Limited
International Computers Limited (ICL) was a British computer hardware, computer software and computer services company that ...
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Cleaning buckling spring keyboards
How do you clean keyboards with buckling springs?
I have mentioned in an earlier question that I've recently bought an IBM keyboard but how do you clean a keyboard with buckling springs? I only know ...
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Unicomp's IBM model keyboards
I've recently purchased the Spacesaver M Black Buckling Spring USB keyboard (still didn't get it due to shipping delays) and was wondering whether anyone has a real original IBM keyboard.
What is so ...
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What sort of intermediate representation did the first Fortran compiler use?
Proebsting's Law asserts that improvements to compiler technology double the performance of typical programs every 18 years, but even granted that this is somewhat tongue-in-cheek, it's not really ...
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Is this keyboard a clone of IBM Model M?
I have this old Quest keyboard:
And I was wondering whether IBM did allow rebranding of their keyboard technology. Physically it seems similar-looking to IBM Model M. Is that a typical el-cheapo ...
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Was there an analog of local labels in the IBM assembly language?
In the assembly language used in Unix on DEC machines (PDP-11, VAX), one can use numerical labels and refer to them with suffixes "b" and "f" meaning "backwards" and &...
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Uninstalling OS/400 by deleting one program
This is about the AS/400 which is an IBM mini-computer launched in 1988. It lives on today after several name changes and considerable hardware and software changes. It is still often informally ...
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Did other computer companies need to license Fortran from IBM?
Reading a fascinating online book about the history of computing, I came across this passage on http://ds-wordpress.haverford.edu/bitbybit/bit-by-bit-contents/chapter-seven/7-5-assembly-language-...
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Why have both the ORG and LOC pseudo-operations in the SHARE/Symbolic/Fortran Assembly Programs for the IBM 704/709/7090/7094?
This is a fairly basic question, and I almost feel ashamed to ask it; I'm guessing it can be answered in a single sentence.
There was a rather influential series of assemblers for some of IBM's ...
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Why was IBM's Scientific Subroutine Package superseded?
It is a familiar fact that scientific software tends to do a lot of vector arithmetic and similar, that one does not want to keep rewriting the low-level code for such, so the usual practice is to use ...
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What keyboard protocol do IBM 3151 Terminals speak over RJ45
I've recently acquired an IBM 3151 Terminal without a keyboard and I'm not willing to spend any money on an original keyboard. This is why I've tried searching Google for any datasheets of the IBM ...
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How to decode hexadecimal number in IBM/360 column binary format
I have a message:
x2400\x1100\x2001\x1020\x2100\x0900\x2008\x2012\x0900\x1001\x2001\x1010\x2001\x0900\x0802\x0812\x1200\x2010\x0802\x1004\x0820\x1010\x2100\x2002\x1012
It's in IBM column binary ...
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