🚀 go-pugleaf

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Remember that the BIOS calls return a long word, with the ASCII code
in the lower 8 bits and the scan-code (tied to the physical key) in
the upper word's lower byte (bits 16-23).  The Fn keys return an ASCII
code of zero, and so do Alt-keys.

There is a separate BIOS function that returns the current status of
the various shift keys (incl. Alt, Ctrl and Capslock).  You need to
call it right after you get a keypress to get the right info.  Note
that the shift keys change the ASCII code returned by some keys (e.g.
shift-letter) but not the scan-code.  Except that shifted Fn keys have
different scan codes than the same Fn keys unshifted, and so do Alt-<x>,
where <x> is a key in the set {[1],...,[=]} (row above QWERTY).

- Moshe Braner