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From: dr@ski.UUCP (David Robins)
Newsgroups: net.micro.apple
Subject: Apple Super Serial Card "interrupts"
Message-ID: <250@ski.UUCP>
Date: Sat, 17-May-86 17:08:43 EDT
Article-I.D.: ski.250
Posted: Sat May 17 17:08:43 1986
Date-Received: Mon, 19-May-86 07:10:59 EDT
Distribution: net
Organization: Smith-Kettlewell Institute, S.F., CA.
Lines: 28

I have long been "troubled" by the SSC interrupt forwarding.  The SSC
manual mentions special switches on pages 8 and 24.

	"Switch SW2-6 controls forwarding of interrupts to the Apple II. 
	Since the Apple II and II+ do not handle interrupts,
	set SW2-6 OFF."

No further mention is made of this switch, and no mention is made of its
application on //e's.

This switch appears to be simply in the IRQ line coming into the SSC.
Therefore, does this switch enable/disable interrupts coming IN to the
Apple from the outside, does it control enable/disable IRQ's from the
Apple to be somehow passed to the outside,  or is the SSC able to
generate IRQ's of its own.

If none of the above, what is the possible function of this switch, 
and how would it be used?

-- 
====================================================================
David Robins, M.D. 
Smith-Kettlewell Institute of Visual Sciences
2232 Webster St; San Francisco CA 94115
415/561-1705
			{ihnp4,qantel,dual}!ptsfa!ski!dr

The opinions expressed herein do not reflect the opinion of the Institute!