ps/1 and ps/2

[obj-c]

what is the difference between these two types of ports?

[rustybarnacle]

Ps2 you can find on modern hardware?

[Surly73]

I haven't checked any references, but having been a computer user back when PS2 was invented I'm not so sure there is a PS1 connector.  There was a PS/1 computer line from IBM, as well as a PS/2.  The connector launched on the PS/2 is foreverafter referred to as the "PS/2" connector.  I think it used to be called the "PS/2 style connector".

The connector is named for the computer it was first found on, it isn't a name which was originally given to the connector itself.  AFAIK.  So if I were to rephrase the answer the way some others here at GH: "The difference is that the PS2 connector exists".

[keyb_gr]

There was a PS/1 computer line from IBM, as well as a PS/2.  The connector launched on the PS/2 is foreverafter referred to as the "PS/2" connector.

This.

Before that, PC keyboards used 5-pin DIN connectors (easily adapted to PS/2 for anything that speaks at least the AT keyboard protocol), same as used for MIDI or older European audio components.