Re: A86: Re: Re: Maskable Interrupts


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Re: A86: Re: Re: Maskable Interrupts





>
>In a message dated 1/2/99 2:36:11 AM Eastern Standard Time,
>assets@eden.rutgers.edu writes:
>
>> not quite, kid.  what halt does is stop CPU operation until an interrupt
>>  occurs, so if you had the interrupts enabled, the calc would turn back
in
>>  less than 1/200 of a second ... it waits for on key to be pressed
instead
>to
>>  be turned back on, since that is also an interrupt.
>>  when it comes to having clock on the 86, i think, bluntly, that kirk is
>>  wrong.  he's over looking the fact that you could use _alt_off to write
>your
>>  own shut down routine that turns off the LCD and loops over a check of
the
>>  bit in that port (i forget which one :P) keeping the interrupts enabled.
>>  also, if you had the conviction, you could write a routine to adjust the
>>  clock for battery power.
>>
>
>
>you could do that, but then the battery power would just be drained
>incredibly.  what's good about using halt is that it uses minimal battery
>power

that's not a problem, loop over a check for the on key _and_ a halt; you
don't really need to check it more than 200 times a second anyhow