[A83] value when no key pressed


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[A83] value when no key pressed



 What value does the TI-83 calculator return in direct input if no key is
pressed?  And in a program could i use the command cp knothing (knothing
being the value when no key is pressed) to check whether or not a key is
pressed?  In Asmguru it tells me that the cp command changes register a, but
is this temporary or permanent because when i displayed the contents of a
after cp it was not changed.

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