collapseos/arch/z80/ti84/blk/614

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2020-05-09 11:55:58 -04:00
Keyboard driver
2020-05-12 12:41:47 -04:00
Load range: 566-570
2020-05-09 11:55:58 -04:00
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.)