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OS X Yosemite, 10.10.3, MacBook Pro mid-2012.

I am building a keyboard, and have mapped onto it all F1-F24 keys using tmk's firmware. F1-F19 all respond (I'm using Karabiner's EventViewer utility to detect keypresses), but F20-F24 do not. I know the keys work physically, but OS X doesn't recognize them.

Is it even possible to use F20-F24 on OS X, or are there other keys unused by OS X that will work (I want to use them as macro keys)?

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    Hi ZuluDeltaNiner. Did you find out more about this? Just curious, what keyboard design are you using? – grettke Apr 23 '16 at 13:57

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