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The TI-83 has a keypad with 50 buttons. The keypad is devided in 7 groups.
The ROM contains several different routines to read keys, each one returning a different
value.
_getkey - waits for a key to be pressed, combinations with 2nd and alpha possible
get_key - the key last pressed
_getk - the same as GetKey in BASIC
You can create your own getkey routine in ASM using the in and out commands.
For more information, visit the Programming section.
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