Re: A82: Turning Calc off

To: assembly-82@lists.ticalc.org
Subject: Re: A82: Turning Calc off
From: "Sam Heald" <evil_sam@hotmail.com>
Date: Thu, 13 Apr 2000 04:27:54 PDT
Reply-To: assembly-82@lists.ticalc.org


>Does anyone know of a better way to turn the calc off controlled in asm
>other than:
>
>CALL $07EA
>
>I'm looking for a way the batteries could be dismantled while it's in
>this "off" mode and no data will be lossed?
>
>Please let me know if there is a way to do this thing I inquire about.
>
>Thanks,
>Jon Johnson


this should work:
DI                  ; disable interrupts
LD  A, 01           ; bit 3 = lcd status
OUT ($03), A        ; bit 0 = ON-interrupt status
EI                  ; enable interrupts
HALT                ; wait for ON (that's the only interrupt)
RES 4, (IY $09)     ; Turn off 'ON' flag
RET
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