[pups] Stray Interupts

Robin Birch robin at ruffnready.co.uk
Mon Feb 26 07:02:52 AEST 2001

This means that it won't be simple to fix!!!!!!!!

It could mean that running Ultrix on a simulator isn't on without some
work on the emulators themselves.  When the SI message is generated it
comes out with a number that looks like an address.  Would this point to
the source of the interrupt?  On p11 it is a constant address, I just
can't remember what it is for the moment.


In message <200102251848.f1PImpn25642 at moe.2bsd.com>, Steven M. Schultz
<sms at moe.2bsd.com> writes
>> From: Robin Birch <robin at ruffnready.co.uk>
>> Having got to the point where I can get ultrix trying to boot on p11 I
>> can confirm that it complains of stray interrupts on p11 as well.  A
>> thought occurred to me over the weekend that I haven't had time to try
>> out.  Is this the toy clock.  It is certainly built into p11, is it
>> built into Bob Supnik's emulator and if so, does it generate interrupts?
>       As Billy pointed out the TOY clock does not generate interrupts.  The
>       line frequency clock does but the TOY clock does not.
>       Looking at the Ultrix-3.1 sources I found something that may be
>       relevant in sys/errlog.c:
> * Log a stray device interrupt.
> *
> * A stray interrupt is defined as one that occurs for
> * a configured device through a valid vector address,
> * but is unexpected. In the case of big disks, a stray
> * interrupt is logged when the interrupt service routine
> * is entered and the device is not active and no attention
> * summary bits are set.
> */
>       One guess is that other systems do not use or concern themselves with
>       'attention summary' bits and simply dismiss the interrupt without
>       comment.
>       Looking at the errlogs (I do not know what the commands for doing that
>       are but a big of digging would probably find them) might yield more
>       information.
>       Cheers.
>       Steven  Schultz
>       sms at moe.2bsd.com

Robin Birch     robin at ruffnready.co.uk

M1ASU/2E0ARJ/M5ABD     Old computers and radios always welcome

Received: (from major at localhost)
	by minnie.cs.adfa.edu.au (8.9.3/8.9.3) id IAA39340
	for pups-liszt; Mon, 26 Feb 2001 08:41:19 +1100 (EST)
	(envelope-from owner-pups at minnie.cs.adfa.edu.au)

More information about the TUHS mailing list