Path: ns-mx!uunet!cs.utexas.edu!swrinde!mips!apple!apple!dlyons
From: dlyons@Apple.COM (David A Lyons)
Newsgroups: comp.sys.apple2
Subject: Re: Boot icons
Message-ID: <66587@apple.Apple.COM>
Date: 5 May 92 09:43:35 GMT
References: <1992Apr30.125310.84@wsuhub.uc.twsu.edu>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 22

In article <1992Apr30.125310.84@wsuhub.uc.twsu.edu> rgshacke@wsuhub.uc.twsu.edu writes:
[...]
>>The ability to not show the icons is already in 6.0, there just isn't
>>any human interface for it.  Set bit 1 of Battery RAM location $5F,
>>and ShowBootInfo will keep its grubby hands off of your boot screen.
> 
>As Bart might say, CEEOOOOLL, MAN!! I'll pull out my toolbox reference and fire
>up some code to do that. First though, are there any side effects to worry
>about? What else does that location do? Any difference between ROM 01 and 03?

Location $5F works the same on ROM 1 and ROM 3, and it's ignored in systems
earlier than 6.0. -- There are no side-effects of bit 1, but some other bits
are used, and the rest are reserved for future use, so be sure to modify only
the bit you intend to!  (ORA #$02 to set bit 1, AND #$FD to clear bit 1.)

-- 
David A. Lyons, Apple Computer, Inc.      |   DAL Systems
Apple II System Software Engineer         |   P.O. Box 875
America Online: Dave Lyons                |   Cupertino, CA 95015-0875
GEnie:DAVE.LYONS  CompuServe:72177,3233 Internet:dlyons@apple.com

My opinions are my own, not Apple's.