[A83] Re: Back to the home screen
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[A83] Re: Back to the home screen
> Van: Patai Gergely <patai.ti@freemail.hu>
>
> > I'm am working with an interrupt prog right now,
> > Everything works fine, it's a password protect program.
> > With APD or 2nd+off, the calc shuts down (from inside
> > my interrupt). Then I ask the keys etc. and then I want
> > to go to the home screen.
>
> I'm just wondering if password protection is possible
> at all on a calculator.
It has been done before, so...
> What happens if the batteries
> are taken out and replaced? Let's say that the calc
> was running our own shutdown routine.
So it's in a HALT you mean?
> After replacing
> the batteries, where do we end up? Is IM 2 preserved,
> for instance?
When the backup-battery was in place then the processor and the memory
would still be the same.
> Normally TIOS seems to handle the removal of the
> batteries as if a 2nd+on had been pressed, but
> how can you simulate this in your interrupt?
What do you want to simulate, and why? The "2nd+on" you are talking about
is just that when the calc turns on, the TIOS checks some values
(checksums?) and if these are incorrect it clears the RAM... Most of the
time these discrepancies in RAM occure because of a power failure.
Henk Poley <><
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