Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!apple!dlyons
From: dlyons@Apple.COM (David A. Lyons)
Newsgroups: comp.sys.apple
Subject: Re: Ending a SYS file
Message-ID: <38725@apple.Apple.COM>
Date: 18 Feb 90 07:19:56 GMT
References: <90044.234706ART100@psuvm.psu.edu> <22086@pasteur.Berkeley.EDU> <13228@fs2.NISC.SRI.COM> <1990Feb16.045044.4162@ux1.cso.uiuc.edu>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 24

In article <1990Feb16.045044.4162@ux1.cso.uiuc.edu> cs122aw@ux1.cso.uiuc.edu (Scott Alfter) writes:
[in the ProDOS 8 QUIT command]
>You'd better throw six zeros after the "HEX 04" command.  Apple ain't using
>them now, but they might in the future.  (BTW, I thought it was four zeros,
>but I've gotten mail since that says to use six.)

In a limited way, the parameters *are* currently used.

If the first one-byte parameter is $EE, then the Quit is an "enhanced"
quit call, and the next (2-byte) parameter points to the pathname of
an application to launch.  The enhanced quit call is currently implemented
only when GS/OS has been booted (and therefore only on a GS).

The application to be launched can be a SYS, S16, or EXE file.  The
high bits of the characters in the name *are* important (they should
normally be off, as for all ProDOS pathnames).
-- 
David A. Lyons, Apple Computer, Inc.      |   DAL Systems
Apple II Developer Technical Support      |   P.O. Box 875
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My opinions are my own, not Apple's.