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From: hoffmann@acl.kodak.com (marty hoffmann)
Newsgroups: comp.sys.amiga.programmer
Subject: Need a helping hand(ler)
Message-ID: <1991Jan31.133838.22329@ssd.kodak.com>
Date: 31 Jan 91 13:38:38 GMT
Sender: news@ssd.kodak.com
Distribution: usa
Organization: Eastman Kodak
Lines: 31
Originator: hoffmann@acl

I'm trying to write a handler for the input device under 1.3, but
I can't seem to get the system to ever call it.  I'm using a very
old version of the ROM Kernal Manual as a guide, and I've done the
following:

	- created a port
	- created an io request (giving it the port)
	- initialized three fields of an Interrupt structure
		(is_Code, is_Data, and ..._ln_Pri (priority 51))
	- opened the input device (giving it the request)
	- initialized the io request for an ..._ADDHANDLER
		(the io_Command and io_Data(?) fields)
	- called DoIO()

The code pointed to by is_Code is a little assembler routine
which moves the the two arguments (A0 and A1?) onto the stack
and then JSR's to my handler written in C.  After the call,
it adds #8 to A7 and returns (this is just like it shows in 
my copy of the ROM Kernal manual -- page 3-113 I think).

Anyway, the creates, open, and DoIO all return OK status, but
it appears that my handler never gets called (the handler 
simply increments a global variable in the program and returns
the event list untouched -- the global variable never appears
to change).  When my program exits (and tries to cleanup the
mess created above) it's GURU city.

Am I missing anything obvious?  Anything obscure? 

						Thanks in advance,
						MRH