Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!hp-pcd!hpcvra!billw
From: billw@hpcvra.CV.HP.COM (William C Wickes)
Newsgroups: comp.sys.handhelds
Subject: Re: HP28 internals
Message-ID: <25590038@hpcvra.CV.HP.COM>
Date: 2 Aug 90 20:31:43 GMT
References: <PEDZ.90Aug1093001@bigben.mpd.tandem.com>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 7

You are probably running into the dark side of HP 28 garbage collection, which
is at its worst when you decompose a list into its elements and leave
those elements on the stack.  You should be able to solve the problem by
storing the list in a global variable BEFORE you use LIST-> (you can
purge the variable after you have finished with the elements).

This is my best guess, without seeing your program.