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Why can't I press multiple keys?

post #1 of 7
Thread Starter 
Sometimes when I press on my keyboard with a specific variation such as Shift + W + Space the space ends up not registering at all.

I am using a laptop ATM and my laptop keyboard has no issue with the Shift+W+Space Combo but for some reason my other keyboard connected through a USB does.

Is there a way to fix this?
post #2 of 7
It's called having a 2KRO keyboard with poor matrix design. Basically your keyboard is cheap and was designed by a chimp who stole the design from elsewhere and didn't know how to adapt the key matrix correctly.


That failure mode sounds a lot like the Logitech Illuminated, in which case it's a "manufacturing error" (translation: design flaw in the key matrix design) which was rectified in newer models.
post #3 of 7
Quote:
Originally Posted by Phaedrus2129;12336986 
It's called having a 2KRO keyboard with poor matrix design. Basically your keyboard is cheap and was designed by a chimp who stole the design from elsewhere and didn't know how to adapt the key matrix correctly.

What the man said.

Most lower end keyboards only do 2kro, which basically means that there are some combinations of keys on the keyboard where the 3rd key does not activate. In your case, shift + W + space is a combination that doesn't work on your board. It can only press 2 of those 3 keys at a time. It's 2kro

There are 6kro or NKRO boards. 6kro boards can do any combination of 6 keys + 4 modifier keys at a time. NKRO boards, like mine, can press all the keys at a time without clogging up.

TLDR: You have a cheap keyboard. Unless you get a better one, this isn't easily fixable.
Edited by De-Zant - 2/10/11 at 12:57pm
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Phaedrus2129;12336986 
It's called having a 2KRO keyboard with poor matrix design. Basically your keyboard is cheap and was designed by a chimp who stole the design from elsewhere and didn't know how to adapt the key matrix correctly.


That failure mode sounds a lot like the Logitech Illuminated, in which case it's a "manufacturing error" (translation: design flaw in the key matrix design) which was rectified in newer models.

The funniest part is, it is the Logitech Illuminated.

LOL.

Thanks for you answer. It helped.
post #5 of 7
I've only ever used cheap keyboards, and have not seen this problem since an *old* HP PS/2 keyboard from 1999.

Seriously. My 19 dollar logitech (with free mouse, lol) has no problems with WASD + space + cntrl/shift combinations. I run out of fingers before it runs out of key-presses. I have a free-with-purchase of a Dell kb, same story.

What's sad is I liked the look of the Logitech Illuminated.. then read the reviews. Ugh.
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post #6 of 7
It's interesting that keyboards do that, but how cheap do they have to be? I've always bought keyboards in the $8 - 15 range and I've never noticed such problems before.
post #7 of 7
Quote:
Originally Posted by mott555;12345227 
It's interesting that keyboards do that, but how cheap do they have to be? I've always bought keyboards in the $8 - 15 range and I've never noticed such problems before.

It isn't necessarily due to cheapness. The vast majority of keyboards use the same key matrix designs, often using the same key matrix that the IBM Model M introduced in 1985 (with slight modifications). The IBM matrix is most common, and there are 2-3 others that you see a lot.

The problem arises when you get some engineer who tries to be clever and come up with his own matrix, or improve on an existing one, and in the process completely screws it up.
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