Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uflorida!mephisto!python!byron
From: byron@python.gatech.edu (Byron A Jeff)
Newsgroups: comp.sys.m68k
Subject: Re: autovector on the '010
Message-ID: <19780@mephisto.UUCP>
Date: 7 Apr 90 22:43:29 GMT
References: <1990Apr07.090036.26347@csuchico.edu>
Sender: news@mephisto.UUCP
Reply-To: byron@python.UUCP (Byron A Jeff)
Organization: Georgia Institute of Technology
Lines: 21

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.

Real simple. Just assert the VPA* line on the processor during the
interrupt acknowledge cycle and it will autovector to the appropriate vector.
Be sure that DTACK* does not get asserted during the interrupt acknowledge
cycle. (That info is for 68000, 008, 010. I'm not sure about 020).

Now a question. Does anyone know a source for MCM68H34 dual port static
RAMS? I'm building a MIDI project with 3 processors and want to use
the RAM for interprocessor communication. Seems almost perfect except
it only has 256 bytes. Any leads on another chip with dual port static
rams would be appreciated.

THANKS,

BAJ