Saturday, 29 June 2019

Keyboard selective ghosting


I've been experiencing a problem with my keyboards lately. I own an Alienware laptop M11x. I've attached a USB Trust keyboard first and experienced some problems while playing FIFA 12. Namely: When the Left and Up buttons are pressed I cannot press one of the buttons S, G, B, N, H. S is very important since it's my pass button.


So I took the keyboard back and bought a Microsoft Keyboard 600. Alas, the problem still persists. I must say that for instance I can press 4 buttons like: A S D F and it will work like a charm.


Update: I must say that that particular problematic combination works on my laptop keyboard and it persists over the whole system.


Cheers



Answer



It's call n-key rollover. It controls the total number of keys that can be pressed at one time on a keyboard before the controller stops recording new keypresses.


Usually, you'll only find full n-key rollover on high end keyboards. Normal or low-end keyboards will generally have a limit after which the keyboard controller will stop recording. As your key sequence is 8 keys long, you're probably well over the limit.


Wikipedia has an article with a few more details: http://en.wikipedia.org/wiki/Rollover_%28key%29#n-key_rollover


If you really, really need a key combination this long for your kick move you'll need to try a keyboard that specifies full n-key rollover as a feature to ensure that the keyboard will always be able to handle every key you press all the time.


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