The following installation instructions were written by
Doug Gilbert at XEROX Palo Alto Research Center.  The data seems
to be quite complete.  Enjoy!

						Rick Conn


            ZCPR2 INSTALLATION ON THE XEROX 820-II
            ======================================

This  file documents some of the ZCPR2 installation parameter's I 
used   for  the  XEROX  820-II  computer.    The   initial   main 
consideration was where to find unused memory for buffers.  There 
appears to be available memory above the CBIOS and I've used this 
area without any problems so far.  This memory is as follows:

     0EE80H TO 0EF7FH:   256 BYTES FREE
     0EFC0H TO 0EFFFH:    64 BYTES FREE

My assignment of this free RAM area for ZCPR2 was as noted below:


     EXTERNAL STACK AREA FOR ZCPR2
     -----------------------------

          0EFCFH TO 0EFFFH    (48 BYTES)

     EXTERNAL SEARCH PATH BUFFER
     ---------------------------

          0EFC0H TO 0EFCEH    (14 BYTES)

     NAMED DIRECTORY BUFFER
     ----------------------

          0EF00H TO 0EF7FH    (128 BYTES)

     MULTIPLE COMMAND BUFFER
     -----------------------

          0EE80H TO 0EEFFH    (128 BYTES)

Thus  far,  I've encountered no problems with these  assignments.  
Please let me know if any areas above are used for other purposes 
in the 820-II system.

-------------------------------------------------------------------

Here is some additional information on the Xerox 820-II
implementation.

The memory map of the system is:

	F000-FFFF	MONITOR, copied from ROM on boot
	EA00-EFFF	CBIOS
	DC06-E9FF	BDOS
	D400-DC05	CCP

The buffer area I use is in upper CBIOS area.

The ZCPR22.ASM file with ZCPRHDR.LIB are assembled and installed
as follows:

1. SYSGEN the 'standard CP/M 22' operating system
2. SAVE 34 CPMIMAGE.COM
3. DDT CPMIMAGE.COM
4. IZCPR22.HEX
5. R3580		(offset is 3580 for 980 CCP)

In my implementation, the CBIOS cold boot routine is modified
with the file MOD820II.ASM.

6. IMOD820II.HEX
7. R3580
8. SAVE 34 ZPRIMAGE.COM
9. SYSGEN new operationg system
10. Include file "STAR.COM" with command line:  RAMINIT;DIR
11. Include file "RAMINIT.COM" on operating system disk


	The files RAMINIT.ASM, RAMINIT.COM, MOD820II.ASM, and MOD820II.HEX
are provided in the LBR File.