NZCPRFIX.DOC
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				      from
			  Horn Engineering Associates
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	[This fix for NZCPR and ZCMD is required for WHATSNEW (D-41  and
	later versions) to work correctly if your CCP is based on NZCPR]

	This fix for NZCPR, probably for all versions, and probably  for
	ZCMD  as well, corrects a problem with the user auto-search that
	will sometimes fail to search all user areas.  In our  case  the
	problem was with NZCPR, Version 1.6.  The problem shows up when,
	for example, you are in USER 4 on DRIVE B and try to  execute  a
	file,  such  as WHATSNEW, that is on B0. NZCPR will first search
	B4; then the  user  area  designated  as  your	restricted  area
	(RESUSER)  if the WHEEL is set for full access; then B0 (if that
	is the DEFUSER that you have specified by  assembly  default  or
	have  set with the DFU function).  In this example WHATSNEW will
	be found on B0, and it will be executed.  If  it  had  not  been
	found  there  the  search  would have continued to DRIVE A, USER
	DEFUSER (in our example, A0).

	Now for the problem.  Suppose that the system had done	just  as
	described  above  and WHATSNEW was found on B0 and executed.  If
	WHATSNEW were to be immediately executed again the search  would
	skip  the  search  of  B0 and go to DRIVE A for the search.  The
	problem is in the NZCPR search code.  When this code  determines
	that  a  target  file  is  not on DRIVE B, it sets a flag called
	DFLAG as an in-line code patch.  After not finding the	file  on
	B0,  the  flag	directs  the system to log-on DRIVE A and search
	USER 0.  The problem is - DFLAG IS SET BEFORE  B0  IS  SEARCHED.
	This does not prevent B0 from being searched the first time but,
	if the target file is found there, it is executed without  DFLAG
	being  reset.  The next time the search is made from a user area
	on DRIVE B other than USER 0, DFLAG will send the search directy
	to A0 without searching B0.

	The fix for this problem requires the addition of four bytes  of
	code.	 This addition will probably not cause an overrun of the
	2K allocation for NZCPR because it only applies when the  SECURE
	assembly  option is selected, in which case considerable code is
	probably not assembled.  That is; if CPRTYP, CPRLST,  or  CPRDIR
	have  been set FALSE.  The new code unconditionally resets DFLAG
	at any time that a file has been found and loaded.  It is  added
	immediately  following	the  label MLA1: just before the file is
	loaded for execution.  This label will be found  very  near  the
	end of the program.  Add the following code:

		IF SECURE
		XRA	A		;get a zero
		STA	DFLAG		;reset DFLAG
		ENDIF	;SECURE

	This code will be followed by the existing label, LOADADR.

	Sorry, but  now  you  must  reassemble	NZCPR,	using  MAC,  and
	reinstall  in  in  your system.  If you have forgotten how to do
	this, look for a library file called CCPLOC.LBR for the details.

						Regards...
						Charles Horn
						4 November 1984