[A83] Re: shut down the caltc : take care of the screen or not ?


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[A83] Re: shut down the caltc : take care of the screen or not ?



> The calc is never really ``off'' unless you pull the batteries.  Turning
> it off merely disables the LCD and puts the CPU into low power mode (using
> halt).  The on key generates an (NMI?) interrupt which breaks the CPU out
> of halt mode.
I'm quite sure it isn't a NMI, as there's no routine beginning at 66h. I
guess you could completely halt the calculator by masking both interrupts
before turning it off.

PG

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