[A83] Re: interrupt with shutdown

[A83] Re: interrupt with shutdown

• To: assembly-83@lists.ticalc.org
• Subject: [A83] Re: interrupt with shutdown
• From: "SUCKER from the old days" <sucker_pvn@hotmail.com>
• Date: Mon, 10 Dec 2001 12:16:47 +0000
• Reply-To: assembly-83@lists.ticalc.org

> > > So I guess it's safe to remove the DI from the start of a
> > > custom interrupt routine.
>
> > But with my interrupt routine I posted earlier, If I don't
> > disable interrupts before I jump to 38h, the calc freezes.
> > That's also the correction I posted afterwards.
>
>The Z80 disables interrupts at the moment it accepts one. If you enable
>interrupts again during the execution of your interrupt routine then it
>might happen an interrupt occures, which causes a whole lot of trouble.

So then it's not that save to do an ei before my halt?

       SUCKER

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• [A83] Re: interrupt with shutdown
• From: "David Phillips" <david@acz.org>
• [A83] Re: interrupt with shutdown
• From: "Tijl Coosemans" <tijl@ulyssis.org>

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