Re: 6551 driver questions

From: Spiro Trikaliotis (trik-news_at_gmx.de)
Date: 2003-08-23 21:19:53

Hello Uz,

On Sat, Aug 23, 2003 at 08:49:21PM +0200, Ullrich von Bassewitz wrote:

> Won't an ACIA NMI get lost in this case? Assume this order:
> 
>         1. CIA NMI triggered
>         2. CIA NMI gets handled, but still stays active
>         3. ACIA NMI occurs, since /NMI is already active, nothing happens
>         4. CIA NMI released. /NMI still active (from ACIA), nothing happens

Well, after releasing a NMI, you should always check all NMI sources so that
you don't miss one.

Spiro.

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