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59 votes
Accepted

How did ALT + F4 become the shortcut for closing?

AltF4 doesn’t come from Windows; it comes from IBM’s Common User Access (CUA), part of its Systems Application Architecture. This was implemented on IBM mainframes, and in OS/2 Presentation Manager ...
Stephen Kitt's user avatar
33 votes
Accepted

Did any MS-DOS program ever use the System Request interrupt?

TL;DR: One of the great Ideas that never Materialized Contrary to what is often assumed, the key was not added to support some 3270-style emulation1, but to enable a basic multi-application/OS ...
Raffzahn's user avatar
  • 225k
20 votes

Did any MS-DOS program ever use the System Request interrupt?

The SysRq key is a perfectly normal key on the keyboard. It does not generate a special or unique interrupt by itself. The standard keyboard interrupt of BIOS just does what it does for all keys and ...
Justme's user avatar
  • 33.7k
8 votes

Were there clones and/or national variants of IBM's 84-key AT keyboard?

The IBM AT Technical Reference Manual of 1984 lists a few variants (p. 4-16): The company I worked in then certainly had the UK keyboard, with the pound sign on the 3 and the hash symbol to the right:...
jonathanjo's user avatar
5 votes
Accepted

Toshiba Libretto 100CT PS/2 keyboard and mouse dual use

TL;DR Yes, assuming that the Libretto has both the mouse and keyboard inputs wired up to the dual purpose PS/2 port in the docking station, as can be inferred from the specifications/manual, then a ...
Greenonline's user avatar
  • 4,386
5 votes

Toshiba Libretto 100CT PS/2 keyboard and mouse dual use

TL;DR: Try It. A splitter won't harm the port, worst that can happen is that the mouse won't work. Through the use of the official dock Which one? Toshiba offered two different ones, the I/O-...
Raffzahn's user avatar
  • 225k
5 votes

What are these keys on the БК-0010-series keyboards, and what do they do?

I would like some clarification to the other existing answers. There was no "insert" mode of inputting text. The only mode was "replace" which was also the default mode on MSX ...
Anixx's user avatar
  • 1,547
4 votes

How did ALT + F4 become the shortcut for closing?

Function keys tended to be chosen rather then Alt+letter as it was common for space on keyboards for printed function key label strips. It also saved requests to have different shortcuts depending ...
Ian Ringrose's user avatar
3 votes

Did any MS-DOS program ever use the System Request interrupt?

The DOS version of the SoftICE debugger allowed the use of the SysRq key to pop up the debugger UI. The VM/386 system allowed up to 99 virtual DOS machines to run simultaneously using a single copy of ...
Alan B's user avatar
  • 4,740
2 votes

What keyboard protocol do IBM 3151 Terminals speak over RJ45

I've recently acquired an IBM 3151 Terminal without keyboard and I'm not willing to spend any money on an original keyboard. That's sad, as the keyboard is about the only reason to spend time with ...
Raffzahn's user avatar
  • 225k
1 vote

Were there clones and/or national variants of IBM's 84-key AT keyboard?

The question mentions “clones” of the 84-key IBM AT keyboard. One such “clone”, or near-clone, was the 85-key keyboard designed by Amstrad for their line of PC compatibles — such as the popular ...
Jukka Aho's user avatar
  • 2,062
1 vote

How did the ZX Spectrum avoid key ghosting?

There are 2 major cause of ghosting in matrix keyboard ... Voltage drop below TTL H/L threshold Depending on the matrix circuitry, once you press keys on multiple rows/columns then the voltage after ...
Spektre's user avatar
  • 7,276
1 vote

How can I connect a modern USB keyboard to a system requiring PS/2?

I know this question is old, but it's 2024 and the problem has only worsened. It's almost impossible to find a keyboard that supports the PS/2 protocol and even active PS2 converters seem to be rare ...
José Ángel Morente's user avatar

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