Path: utzoo!attcan!uunet!know!zaphod.mps.ohio-state.edu!swrinde!kent
From: kent@swrinde.nde.swri.edu (Kent D. Polk)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Shared Interrupts (was Parallel Port question)
Keywords: interrupts
Message-ID: <28220@swrinde.nde.swri.edu>
Date: 14 Sep 90 14:13:24 GMT
References: <28208@swrinde.nde.swri.edu> <14434@cbmvax.commodore.com>
Reply-To: kent@swrinde.UUCP (Kent D. Polk)
Organization: Southwest Research Institute, San Antonio, Texas
Lines: 33

In article <14434@cbmvax.commodore.com> rsbx@cbmvax.commodore.com (Raymond S. Brand) writes:
>In article <28208@swrinde.nde.swri.edu>, kent@swrinde.nde.swri.edu (Kent D. Polk) writes:
>> low until I'm finished? My isr is pretty busy & takes about 600 us to
>
>Doesn't matter when you release the interrupt line; however, we recomend your
>interrupt code take less than 250 us.

Ok, I guess I have some work to do :^) I did notice that when I try to
'overload' the system with my interrupts, a system crash is much more
imminent. When I just service the interrupt hardware (~45 us) I don't seem
to have much of a problem. Maybe I'm just taking too long.

>>   d. Can I just say 'Not mine' to all of them? Does the system get confused
>                             If after processing the list of servers, an
>interrupt is (still) pending, the list is re-traversed. What this means is:

Just to make sure, let me re-phrase: Can I go ahead & service my
interrupt & tell the system that it wasn't my interrupt by returning a
0? If I understand correctly, all that will happen is that the list
traversal will continue versus being 'short-circuited'. Correct?

>------------------------------------------------------------------------
>  Raymond S. Brand			rsbx@cbmvax.commodore.com
>  Commodore-Amiga Engineering		...!uunet!cbmvax!rsbx
>  1200 Wilson Drive			(215)-431-9100
>  West Chester PA 19380			"Looking"
>------------------------------------------------------------------------

Thanks very much for your assistance,

Kent Polk: Southwest Research Institute (512) 522-2882
Internet : kent@swrinde.nde.swri.edu
UUCP     : $ {cs.utexas.edu, gatech!petro, sun!texsun}!swrinde!kent