RCPM is a version of CP/M for the Amstrad CPC 464 and Vortex SP memory expansion by Günter Radestock.
RCPM Manual (pdf) (german)
The rcpm can be downloaded at www.znode51.de.
Here are local copies of the archives:
Use File:Nulu.zip from
Z-80 Public Domain to extract the archives under CP/M. Unzip the com file.
Under MS-DOS use File:Cfx13.zip from gaby.de to extract the lbr files.