Z-80c
The Z-80c has a 4 MHz Z-80B microprocessor for running 4.0 and earlier CP/M software. It can use all 128K in the Ilc, or 64K can be reserved as a RAM disk. AE released their own version of the operating system called CP/AM.
Manuals & files
Opens on ae.applearchives.com (not rehosted here).
Source page: https://ae.applearchives.com/apple_c/z-80c/