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Many times when I'm working on Flash games I'll find that a particular combination of keys held at the same time doesn't register, e.g. LEFT, DOWN and SPACEBAR.

I know from my days playing Doom this can be caused by the keyboard hardware, but surely technology has moved on since those spongy beige PS2 keyboards?

So my question: are these problems caused by Flash, by the hardware, by the operating system, or something else?

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it's still keyboard hardware limitations. http://en.wikipedia.org/wiki/Rollover_%28key%29

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The problem also occurs in Java games so I suspect it's on the OS level or lower.

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What you want to do is to have Boolean variables and turn them on and off while they are pressed and un-pressed. Flash has a combination of just a couple of keys(i do not know why) but you can easily get around it by just keeping your variables up to date when they are pressed and released.

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  • \$\begingroup\$ -1 In this circumstance, Iain is talking about a situation where Flash actually never gets informed of the keypress, so this is useless. \$\endgroup\$
    – doppelgreener
    Aug 22, 2012 at 6:54

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