Path: utzoo!attcan!uunet!bu.edu!orc!decwrl!apple!dlyons
From: dlyons@Apple.COM (David A. Lyons)
Newsgroups: comp.sys.apple2
Subject: Re: ROM 03 firmware problem...
Keywords: firmware
Message-ID: <42403@apple.Apple.COM>
Date: 27 Jun 90 07:44:47 GMT
References: <4998@plains.UUCP> <756@lee.SEAS.UCLA.EDU>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 27

In article <756@lee.SEAS.UCLA.EDU> gerardo@island.seas.ucla.edu (Gerardo Chaves) writes:
>I have ran into something that I hope is not an incompatibility problem
>with the ROM 03 IIGS machines. I use TML Pascal II to write games for
>handicapped children and in order to use the TouchWindow (tm) I have to 
>read values from the jostick port. To accomplish this I have been using
>a toolbox call to FWEntry to access the routine PREAD (at $FB1E). I works
>fine on the ROM 01 machines but does nothing on the ROM 03's. I went into
>the monitor (yes, after booting with GS/OS) on both machines and the 
>information at 00/FB1E is different.

$FB1E is still a supported entry point, as you can demonstrate by using
the PDL() function in Applesoft.  I don't know why it's not working for
you--post or email me some code, and I'll give it a try on my ROM 03
machine at work.

When you looked at $00/FB1E, you were looking at bank-switched "language
card" RAM, *not* at the ROM.  To see the firmware in the monitor, you have
to look in bank $FF, even though a running program normally sees firmware
in bank 0, $D000-FFFF.
-- 
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.