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mechanical keyboard via PS/2 or USB? - Page 2

post #11 of 14
Quote:
Originally Posted by jasonc View Post

Corsair keyboards feature FULL NKRO on USB.

Yes, this is true these days, several keyboards like the Corsairs and the CM Storms are capable of "NKRO" through USB now.

The real difference is how the processor interprets commands from each, via usb, each keypress comes in as a high priority command and is placed at the top of the "stack" so to speak, and treated as first come first serve. As a result, USB still doesn't technically support NKRO, it now just supports 20KRO, which is high enough to basically be equivalent to NKRO.

PS/2 on the other hand works as a direct hardware interrupt to the CPU, so the moment a key is pressed, the PS/2 connection tlls the CPU, no matter what it is doing, allocate at least enough processing power to execute the command, and execute it immediately. This is how NKRO is possible, as the only technical limitation is the processor's ability to multitask, which is for all intents and purposes infinite due to the lack of effort required to process a keypress.

What does this mean? If you wanna leave it to cold hard technicalities, PS/2 is capable of NKRO and frees up a usb port, so I say use it if you have a PS/2 port and PS/2 adapter, but if not, screw it, the difference is extremely negligible.

EDIT: Note to jayfkay, anti-ghosting only applies to non-mech boards, which are capable of no KRO, or very small KRO. Anti-ghosting is a way of handling commands from such boards in a way that minimizes the delay between them.
Edited by RatPatrol01 - 6/5/13 at 8:44am
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post #12 of 14
Oh cool. Thanks bro. Maybe someday I will update from ps2 if I do not find a adapter that works good for my old dell mechanical
post #13 of 14
Quote:
Originally Posted by bighoppins View Post

Oh cool. Thanks bro. Maybe someday I will update from ps2 if I do not find a adapter that works good for my old dell mechanical

If that would work, it won´t be near NKRO. The chips implemented for that are way newer.
For the good ol´ mechs stay PS/2.
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Ztylo
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post #14 of 14
Yep. Lol I have a dell 101. Great keyboard unfortunately the x58so I got for dirt cheap has no ps2. Now I'm looking for a good adapter that would work with nkro.
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