Path: utzoo!mnetor!uunet!husc6!think!ephraim
From: ephraim@think.COM (ephraim vishniac)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Patching traps in LSC
Message-ID: <18033@think.UUCP>
Date: 15 Mar 88 15:32:26 GMT
References: <7679@agate.BERKELEY.EDU>
Sender: usenet@think.UUCP
Reply-To: ephraim@vidar.think.com.UUCP (ephraim vishniac)
Organization: Thinking Machines Corporation, Cambridge, MA
Lines: 33

In article <7679@agate.BERKELEY.EDU> jmm@thoth9.berkeley.edu () writes:
>Also, I need to find out what the format for PTCH resources is, and exactly
>what they do and when they are executed/loaded.
>Is there a tech note on this subject that I've missed?

PTCH resources contain patches that are installed early on in the
bootstrapping process.  So far as I know, they're just naked code.
The PTCH executed is selected according to the ROM version number of
the machine that's starting up.  This way new versions of the Apple
system software can contain different patches for different machines
with different ROMs.

I doubt that Apple will ever officially document the format of PTCH
resources.  They're not there for 3rd parties, just for Apple use in
patching the system.  Outside developers are expected to use INITs,
which are much more flexible, easier to install, and generally
approved of.

Why exactly do you *need* this information?  I'm curious.

>Thanks,

You're welcome.

>/ James Moore		/    	|  jmm@bartleby.berkeley.edu



Ephraim Vishniac					  ephraim@think.com
Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214

     On two occasions I have been asked, "Pray, Mr. Babbage, if you put
     into the machine wrong figures, will the right answers come out?"