Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!portal!cup.portal.com!David_Michael_Kaffine
From: David_Michael_Kaffine@cup.portal.com
Newsgroups: comp.sys.handhelds
Subject: Re: Today the subject is libraries (LONG)
Message-ID: <35980@cup.portal.com>
Date: 16 Nov 90 04:49:45 GMT
References: <46387@eerie.acsu.Buffalo.EDU>
Organization: The Portal System (TM)
Lines: 30

(I'm still trying to get used to posting, bear with my mistakes)

Just one more note on library objects.  I made a small mistake in
my previous post.  When you install a library with an incorrect CRC,
it does not get moved so that all of the 'good' objects in that port
are contiguous, as I stated before.  Instead, the object stays 
still, and the prolog (in this case, #02b40 for a library) 
is overwritten with 0's.  This 00000 is also what's used to 
mark the end of objects in a port (i.e Port 0, at least, is
just a sequence of RPL objects, terminated by 00000).  Thus, the bad
object is now hidden, ALL objects that were after it in port memory
are hidden, and you're suddenly missing a fair chunk of memory.  The
only reasonable way of getting the memory back is to archive your user
data, do an ON-A-F, and restore your user data.

I apologize for the mistake - my memory on this was a few months old,
and wasn't refreshed until I installed Jim Cloos' sample library and
saw the same things over again.

To summarize:  If you store the library object from Jim Cloos' article
into port 0 and press ON-C (or turn calc. off and on), you will get the
message "Invalid Card Data".  The library will no longer show up in the
port 0 listing.  Anything that was previously in the port 0 listing will
no longer show up.  All of the objects that have disappeared are still
taking up memory.  A memory-clear will reclaim the lost memory (not to
mention your user variables!).


Dave.Kaffine@MicroProd.NCR.com		or
David_Michael_Kaffine@cup.portal.com