[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 ?



At 07:25 AM 8/16/2003 +0100, you wrote:
> > 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

You indeed need to pull the batteries when you have disabled interrupts or 
masked them all out and then execute a halt.

Martin





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