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From: srg@quick.COM (Spencer Garrett)
Newsgroups: comp.sys.m68k
Subject: Re: autovector on the '010
Message-ID: <7821@quick.COM>
Date: 9 Apr 90 07:39:48 GMT
References: <1990Apr07.090036.26347@csuchico.edu>
Organization: Quicksilver Engineering, Seattle
Lines: 12

In article <1990Apr07.090036.26347@csuchico.edu>, garlick@csuchico.edu (Jim Garlick) writes:
> In my 68010 manual, I'm having a hard time finding where it says
> how to use interrupt autovectoring.  On the 030 and 040, you pull
> the AVEC* line, right?  What do you do on the 010 and 020?  I'd 
> like to avoid handling an interrupt acknowledge cycle at all, 
> if possible.

Can't avoid it.  The best way I've found to handle this problem is
to make sure that the last 7 words of the physical address space
are in RAM or ROM and then put the autovector numbers there.  If you
don't mind a bit of hardware, the a single '244 or '245 on the
low byte will do (selected by fc=111).