Re: A86: LCD stuff

To: <assembly-86@lists.ticalc.org>
Subject: Re: A86: LCD stuff
From: "David Phillips" <david@acz.org>
Date: Sat, 20 Nov 1999 12:28:18 -0700
References: <0.18eea9ff.2567f5e5@aol.com>
Reply-To: assembly-86@lists.ticalc.org


Actually, the Z80 _does_ have priorities for interrupts, as most CPUs do.
They just aren't of any use on the 86, because it only has two interrupts.
See Dux's page for details:

http://www.eden.rutgers.edu/~assets/t11.html

> In a message dated 11/20/99 07:44:06 Eastern Standard Time,
> TGaArdvark@aol.com writes:
>
> > > Couldn't it simply be a high-priority maskable interrupt?
> >
> >  How could there be interrupts that run at different priorites?
> >  Explain.
> >
>
> Well, port 3 allows you to "mask" the timer interrupts, whereas it doesn't
> allow you to "mask" the on interrupt.  So although the z80 has no priority
> settings, the hardware itself can allow certain interrupts to be more
> important than others.

References:

Re: A86: LCD stuff

From: ComAsYuAre@aol.com