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I've read claims (forums) that ps/2 port in modern hardware is actually usb emulating ps/2. But I can't find sources to this claim anywhere.
If it's true, does it work like that for all motherboards or do high end boards still have true ps/2? (Eg. Asus apex)
There seem to be many claims saying that ps/2 does not interrupt cpu like it used to, but no actual information online.
Does anyone know?

First of all, you need to check if the CPU has a PS/2 port or not.

projectormonitor wrote: ↑

26 Dec 2024, 21:17

I've read claims (forums) that ps/2 port in modern hardware is actually usb emulating ps/2. But I can't find sources to this claim anywhere.
If it's true, does it work like that for all motherboards or do high end boards still have true ps/2? (Eg. Asus apex)
There seem to be many claims saying that ps/2 does not interrupt cpu like it used to, but no actual information online.
Does anyone know?

This is a great question which I've been checking into as well.
If this was the case, one would have to experiment with a few platforms to get an idea when it stopped being "hardware" but "software"
So you'd test a few setups, such as: KentsField or YorkField (Q6600, Q9550), DDR3 era (Sandy-Haswell), Skylake (6-10th), ADL/RPL (12-14th), AM3-5

You'd test a few Window versions for how their PS/2 driver (i8042prt.sys, stock Microsoft one) behaves, depending on keyboard (whether native / passive or active adapter)

There are also BIOS settings which may impact results.

As you can see, it's not that easy to give an definitive answer without having all these variables in check.

Maybe I'm missing some low-level context, where someone has found out through inspecting BIOS that PS/2 is being emulated, but I haven't come across such findings.