geekhack
geekhack Community => Keyboards => Topic started by: Typhaeon on Fri, 24 February 2012, 21:55:02
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I recently bought this keyboard and picked it up from the seller's distribution center (there's a thread in Great Deals about this particular model). I'm having some really odd rollover issues that are confined to very specific keypress patterns in particular. When A and W are pressed at the same time, for example, the entire rest of the row from those characters on does not register keypresses. Only Q will register as the third rollover key with that combination. Worse, holding down O and K at the same time will render the entire two rows dead to a third key rollover; this includes literally every two-key hold that progresses in a diagonal down-left pattern from the top-mid right of the keyboard to E+S. Keys pressed top to mid in a diagonal down-right pattern disable 2 keys around the keypress, with the rest being recognized (i.e. E+D disables the S and R keys, but no others on either row).
When AS is held down, Q, W, Z and X will not register as a third rollover key. J+N disables only H and M, which seems to go against the hypothesis of the whole diagonal down-left top to mid pattern being applicable to the bottom row as well.
Pressing any two keys in a diagonal down-left pattern from mid to bottom disables every key in either row for a third rollover also.
Does anybody who knows anything about electrical engineering, circuitry, etc have any idea why these particular patterns are cropping up?
I don't particularly mind using this keyboard as a typing model for work or writing exclusively, but it's disappointing that its uses in gaming have to be limited with a standard WASD configuration.
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That is standard behavior for keyboards without diodes.
http://www.dribin.org/dave/keyboard/html/
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Welp, time to learn how to install some goddamn diodes.
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Typhaeon, I just tried your combos on my Data911 TG3 (I believe it has the same internals as your Deck) and got the same results! In contrast, my Kinesis Advantage (6KRO, diodes, fancy controller) passed those tests fine.
Anyway, the good news is that there is no defect on your particular keyboard.
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Well, I can't really complain, since it was a $50 small-form mech keyboard, but I wish I could do something about it. Wasn't sure if it had the same issues as the models mentioned in the NKRO wiki, since it's differently branded ("TG3 BL82").
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As helpful as the NKRO wiki is, it isn't superhuman, and doesn't detail how to fabricate silicon wafers, electronic connections and circuitry, which is what I'd need to do to gut this board and replace it with internals that didn't suck.
Thanks to everybody for the very helpful responses.