this post was submitted on 04 Aug 2024
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Yeah but try pressing more than 4 keys at once on the PS2 keyboard and get back to me
That is a limitation of the keyboard not PS/2. Unlike USB which is limited to 10 simultaneous key presses, PS/2 supports full n-key rollover.
USB is not limited to 10, or 6 as is sometimes stated.
https://www.devever.net/~hl/usbnkro
Interesting I did not know that.
Well I never had a fancy gaming keyboard back in the PS2 days lol
How about a fancy IBM keyboard? The Model F from 1981 features n-key rollover. Don't ask me why they needed it at the time though. It probably wasn't important as the Model M from a couple of years later dropped that feature.
This, it’s why I still use the PS2 interface. Full n-key rollover is impossible for me to do without.
USB does not have that limitation.
Ah, had to dig into it. There was a long period of time during which you couldn’t find a USB NKRO keyboard. Seems that has been fixed.
What's n-key rollover?
You can press all keys at once and they all register.
What's the use for that?
Welcome to now!
Out of curiosity, what is the practical use of full N-key rollover? I can't think of many things that require me to press more than maybe five keys at a time.
Used to have these problems when we were children and playing fighting games with my brother with one keyboard or guitar hero clones that need you to press multiple buttons at the same time, that's the only use case I could think of. I don't know if there's any modern software that requires you to mash more than 2 or 3 buttons at the same time
Bit of a niche use-case, but I'd like to have it for using my laptop keyboard as a piano keyboard, for basically MIDI input (via VMPK or one of the DAWs with this feature built-in).
There's even certain combinations of just 4 keys, which I simply cannot play...
If you type really fast, you’ll find it.
Dude just switch to vim already
Idk but Doom runs pretty well
Dude, just switch to Webstorm already
Nothing to do with the interface. If your keyboard can only do 4 it means that the manufacturer has cheaped out on diodes and couldn't even be bothered to stagger the matrix enough to make you not notice.
I think you're confusing USB and PS/2. USB has (or used to have?) a limit on the number of keys you could press, whereas PS/2 supports n-key rollover.
USB supports NKRO as well as the default 6KRO.
Historically it didn't support it though, whereas PS/2 always did.
Historically computers only supported punch cards, it feels weird to only focus on past capabilities. https://www.devever.net/~hl/usbnkro
I mean... the post is about PS/2, which is a past capability too.
The site you linked to just shows a blank page for me in Firefox. Works in Chrome though.
Works fine for me in Firefox for Android. Weird. Everyday I remind myself how happy I am that I'm not a frontend dev lol.
Huh yeah, it works on my phone but not on my PC. Not sure why.
Preposterous, I've used emacs on a ps2 keyboard without issues.
I recall NKRO was the selling point on some of those keyboards, my old steel series mechanical will absolutely let you mash all the keys with a ps2 adapter.
Ok, but why would you ever? Genuinely curios.
Video games
Never had issues with it, but fair. Different strokes.
Try playing a rhythm game on a most PS2 keyboards 😟
Also with certain button combinations it was less than 4. You could only hold 2 arrow keys down at a time.