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collapseos/blk/564
2020-05-09 20:54:47 -04:00

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Keyboard driver
Low layer range: 566-570
Implement a (key) word that interpret keystrokes from the
builtin keyboard. The word waits for a digit to be pressed and
returns the corresponding ASCII value.
This routine waits for a key to be pressed, but before that, it
waits for all keys to be de-pressed. It does that to ensure
that two calls to _wait only go through after two actual key
presses (otherwise, the user doesn't have enough time to
de-press the button before the next _wait routine registers the
same key press as a second one).
(cont.)