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From: magras@cpsin2.cps.msu.edu (Jean C Magras)
Newsgroups: comp.sys.apple2
Subject: ProDOS Buffer Problem
Message-ID: <1990Sep13.232830.1346@msuinfo.cl.msu.edu>
Date: 13 Sep 90 23:28:30 GMT
Sender: news@msuinfo.cl.msu.edu
Organization: Dept. of Computer Science, Michigan State University
Lines: 26



Hi Fellow Apple 2 Lovers!
  I'm having a ProDOS problem  with the FREe BUFfeR routine pointed to by the $BEF8
vector in the Basic System Global page ($BE00-$BEFF). This routine manipulates the
following zero page pointers:
                $67/$68 : start of applesoft program ($801 usually)
                $69/$6a : bottom of simple variables ($803   "    )
                $6b/$6c : bottom of array variables  ($803   "    ) 
	        $6d/$6e : bottom of free space       ($803   "    )
                $6f/$70 : bottom of strings          ($803   "    ) 
		$73/$74 : Hi usable space for variables+1 ($c000)


This routine trashes my program (about $b00 and beyond) which runs from $800 - $2000
when FREBUFR is called. I have attempted to get the $67-$70 crowd to point to $200x
but when this is done GETBUFR ($bef5) reports "NO BUFFERS AVAILABLE". Sandy 
Mossberg's September 1985 article in Nibble on these 2 routines offers little help.

HELP!!!!

Thanx in Advance!
J.C. 

           "The first half of our lives is ruined by our parents and the
           second half by our children." Clarence Darrow