Re: A86: Re: LCD stuff
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Re: A86: Re: LCD stuff
By the way, how much power does the processor consume when the calc is
'off'? I looked up the halt instruction in the z80 data book to try and
resolve an old dispute with a friend of mine over whether it is ever
truly off or not (off as in no power usage). I found that the halt
instruction waits for an interrupt, during which time it runs a
continual cycle of NOP instructions internally, to maintain memory
refresh logic for dynamic memory chips. I don't think the 86 uses
dynamic memory (or maybe it does?), but the z80 still runs during a
halt, so therefore it must consume power, so therefore the calculator is
never truly turned off except when the batteries have been removed. How
much power does it take? If you left it off for a long time, would your
batts run down?
Can the processor run off the backup battery, or is the backup battery
isolated to the memory power circuit?
Cassady Roop
> Is it relying on the back-up or regular batteries when
> the LCD is off using this method?
>
> -Barcode (Andy D.)
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