Re: A86: Tamagotchi?
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Re: A86: Tamagotchi?
> The Z80 is NOT executing instructions when the calculator
> is "off"; it is stopped on a HALT instruction, and the 200-times-per-second
> interrupts are disabled. (I'm not sure whether the device that generates
> the interrupts is disabled or whether the processor is put into a mode in
> which it ignores the interrupts without executing instructions).
No, actually the interrupts are NOT disabled. If they were, the calculator
would not be coming back on. If you read your Z80 manual, you would
notice that the only way to terminate HALT is with interrupts. Adding
a few lines to the interrupt handler would not take up that much current.
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