Re: Why no interrupt priorities?

Michael Frank
2004-02-27T19:42:17Z

On Fri, 27 Feb 2004 13:42:12 -0500 (EST), Richard B. Johnson <root@chaos.analogic.com> wrote:

>
> In the early IBM/AT, there was a port to which a user of
> a shared "edge" interrupt could write. If the interrupt
> line was still asserted, this would generate another edge.
>
> This meant that any ISR needed to know about other users
> of the same interrupt. This is probably why it didn't
> catch on.

Oops, never seen that in the circuit diagrams. Was that an internal prototype?

Regards
Michael

Ooops2 sorry for priv msg, time to have a nap....