Determining scancodes for obscure keyboard to modify keymap

[carnage]

I'm wondering how to go about determining the scancodes for keys on
keypress.

I am looking to remap an apple usb keyboard (a1048).  It has F13-16, 3
volume control keys and an eject key but no scroll lock, num lock,
pause/break, etc.  I'm wondering how I would go about changing some of these
not so useful keys into useful keys.

The keymap files in /usr/share/syscons/keymaps seem easy enough to modify
but I am unsure of how to determine what the scancodes associated with the
actual keys on keypress are.

As an interesting aside: in x, control + option (alt) + backspace works to
terminate x yet control + option (alt) + Fn (F1, F2, etc.) does not work to
switch back to the virtual terminals.
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