Need help with Device Driver

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#2718

From: Terry Fisher
Date: Thu, 14 Dec 1989 02:12

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I am trying to figure out how to write a device driver.  Right now, I
need to know which registers are initialized to what values when the
Open, Close, BeginIO, AbortIO functions are called.  I know that a6
contains a pointer to the device, a1 points to the request block.  I also
know that d0 contains the unit numer and d1 the flags on an open.

Are there any others registers set up that the device can take advantage
of?

Thanks,
Terry Fisher			thfisher@lion.waterloo.edu
Waterloo, Ontario, Canada	{...}!watmath!lion!thfisher
(519) 885-2785

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watserv1!watdragon!lion!thfisher
From: thfisher@lion.waterloo.edu (Terry Fisher)
Newsgroups: comp.sys.amiga.tech
Subject: Need help with Device Driver
Summary: Which registers are set up by the system.
Message-ID: <19280@watdragon.waterloo.edu>
Date: 14 Dec 89 02:12:03 GMT
Sender: daemon@watdragon.waterloo.edu
Reply-To: thfisher@lion.waterloo.edu (Terry Fisher)
Distribution: na
Organization: U. of Waterloo, Ontario
Lines: 13