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41 points

Yeah but try pressing more than 4 keys at once on the PS2 keyboard and get back to me

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4 points

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.

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8 points

Preposterous, I’ve used emacs on a ps2 keyboard without issues.

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26 points

Dude just switch to vim already

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4 points

Dude, just switch to Webstorm already

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4 points

Is CS available in vim yet?

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6 points

Idk but Doom runs pretty well

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13 points

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.

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11 points

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.

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2 points

USB supports NKRO as well as the default 6KRO.

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1 point

Historically it didn’t support it though, whereas PS/2 always did.

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2 points
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Ok, but why would you ever? Genuinely curios.

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8 points

Video games

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1 point

Never had issues with it, but fair. Different strokes.

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3 points
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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.

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34 points
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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.

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3 points

Well I never had a fancy gaming keyboard back in the PS2 days lol

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4 points

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.

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47 points

USB is not limited to 10, or 6 as is sometimes stated.

https://www.devever.net/~hl/usbnkro

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6 points

Interesting I did not know that.

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3 points

This, it’s why I still use the PS2 interface. Full n-key rollover is impossible for me to do without.

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7 points

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.

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18 points

USB does not have that limitation.

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