Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!uwm.edu!zaphod.mps.ohio-state.edu!usc!apple!dlyons
From: dlyons@Apple.COM (David A. Lyons)
Newsgroups: comp.sys.apple2
Subject: Re: GS/OS Device Driver Question
Message-ID: <43374@apple.Apple.COM>
Date: 27 Jul 90 01:56:47 GMT
References: <1990Jul25.145501.25289@maytag.waterloo.edu>
Distribution: na
Organization: Apple Computer Inc, Cupertino, CA
Lines: 21

In article <1990Jul25.145501.25289@maytag.waterloo.edu> ckirie@csg.UWaterloo.CA (Chris Irie) writes:
>Ahoy one and all...
>I have a question regarding GS/OS Device Drivers that maybe someone
>out there could answer (please?)
>[...]
>So, the question is: How do I keep my driver in memory at all times,
>even when I switch into and out of PRODOS 8? 

The "restartable" bit is bit 15 of your device_characteristics word.
Set that, and make sure your driver is prepared to be started again
(in other words, watch out for pre-initialized storage locations in
your driver...you can restore them to their initial values at
driver-shutdown time if that's convenient for you), and you're set.
-- 
David A. Lyons, Apple Computer, Inc.      |   DAL Systems
Apple II Developer Technical Support      |   P.O. Box 875
America Online: Dave Lyons                |   Cupertino, CA 95015-0875
GEnie: D.LYONS2 or DAVE.LYONS         CompuServe: 72177,3233
Internet/BITNET:  dlyons@apple.com    UUCP:  ...!ames!apple!dlyons
   
My opinions are my own, not Apple's.