This is a generic ZPM3 adaptation for RomWBW.

To start ZPM3, first boot into CP/M 2.2 or ZSystem.  Then
switch to the drive that contains the ZPM3 hard disk image
and run CPMLDR.  You will be prompted for the disk unit
of the ZPM3 image.

You may notice that there is a ZPMLDR application on the
hard disk image.  This application is equivalent to CPMLDR,
but it has some issues with the number of drives that
RomWBW supports.  So, as indicated above, use CPMLDR to
launch ZPM3.

I have not found a way to make ZPM3 start up with any drive
other than A: as the system drive.  So, during the load
process, the boot drive and drive A: are "swapped" so that
the boot drive is always drive A:.  Use the ASSIGN
command after starting ZPM3 to see how the drives get
mapped.

Per ZPM3 standard, files are distributed across different
user areas depending on their usage.  Normal applications
are in user 15.  Help files in user 10.  Configuration 
files in user 14.

In addition to the applications provided in the ZPM3
distributio, the normal CP/M 3 files are included in user
area 15.  A few typical ZCPR utility programs are also included
in user area 15:

 - ALIAS
 - ARUNZ
 - ERASE
 - HELPC (named ZHELP)
 - LBREXT
 - SALIAS
 - SETPATH
 - VERRROR
 - VLU
 - ZCNFG
 - ERASE (named ZERASE)
 - ZEX
 - ZFILER
 - ZP
 - SHOW (named ZSHOW)
 - ZXD

It is a bit confusing, but the ZPM3 system file is called CPM3.SYS.
This is the ZPM3 default configuration and I guess it is done this
way to maximize compatibility with CP/M 3.  You will notice that
the startup banner will indicate ZPM3.