A86: Re: Interrupts

To: <assembly-86@lists.ticalc.org>
Subject: A86: Re: Interrupts
From: "Dux Gregis" <assets@eden.rutgers.edu>
Date: Sat, 5 Dec 1998 22:20:16 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org



>
>OK, simple question time. What happens when you enable/disable interrupts?
I'm
>assuming that, in the code:
>
>di
>

disable interrupts, I think you mean

>will enable interrupts and
>
>ei
>
>will enable interrupts. What happens when you do this? How many T-states
does
>each take? Most importantly, would it be wise or a good idea to
>disable/renable interrups during "Computationally Expensive" parts of code?

The z80 pauses execution and calls an interrupt sub routine about 200 times
a second.  You really have no reason to keep the interrupts enabled unless
your routine uses them or unless you need to call _getkey or something like
that.

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