The Z-System (ZPM) is the name for a CP/M replacement which provides much more functionality.
CPM 2.2
The Z-System is called ZCPR3:
- ZCPR is a CCP replacement
- ZSDOS is a BDOS replacement
In the early versions of ZPM, ZCPR was installed by patching CPM2.2, later versions use NZ-COM to make this easy.
CPM+
The Z-System is called Z3PLUS
- ZPM3 is a BDOS replacement
- ZCCP is a CCP replacement that implements ZCPR 3.3