Date   : Mon, 09 May 1988 23:50:55 GMT
From   : portal!cup.portal.com!raf@uunet.uu.net
Subject: UNARC and location 3EH

Tony Addyman (MA18@SYSE.SALFORD.AC.UK) writes about the inability to extract
from archive files using a wheel-byte protected version of the UNARC program.
This is a classic example of what happens when programs are distributed in a
form other than that recommended by the author.

Apparently, Tony is using a version of UNARC which has been modified for use
on remote BBS systems (RCP/M's).  Let me assure Tony that (1) UNARC has the
capability to extract, as well list and typeout, archive files (that is the
the primary reason for the program's existence), and (2) the authorized
distribution of UNARC.COM will work on virtually any standard CP/M system
without alteration (or sensitivity to location 3E).

The latest (and only such) "authorized" distribution, version 1.6, is
contained within a file named UNARC16.ARK.  This is a "self-extracting"
archive.  If no earlier version of UNARC is available, this file can be
renamed to UNARC16.COM and then executed on the user's system.  This will
generate working program versions for both Z80 systems (UNARC.COM) and 8080
systems (UNARCA.COM), along with program documentation (UNARC.DOC) and all
associated files.

In particular, an assembly language overlay file (UNARCOVL.ASM) is provided
for purposes of local modifications to UNARC for non-universal options (such
as wheel-byte protection used on RCP/M systems).  That file contains an
explicit warning to not redistribute modified versions of the program.  This
warning was apparently ignored by whoever supplied Tony with his copy of the
UNARC program.

Bob Freed               Internet: Robert_A_Freed@cup.portal.com
Newton Centre, MA       UUCP: ...!sun!portal!cup!Robert_A_Freed


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