The Z80 CPU has been manufactured by others, and various Z80s have been used in the construction of the CPC during its lifetime:
* MOSTEK Mostek MK3880N-4 [https://www.cpcwiki.eu/imgs/e/ee/MC0008D_Z70200_LeZone_PCB_Top.jpg Source]
* NEC D780C [https://www.cpcwiki.eu/imgs/c/c6/CPC464_270100_MC0001A_PCB_Top.jpg Source]
* SGS Z8400AB1 [https://www.cpcwiki.eu/imgs/5/52/CPC464_PCB_Top_%28Z70200_MC0002B%29.jpg Source]
* ST Z8400AB1 [https://www.cpcwiki.eu/imgs/8/8e/CPC464_PCB_Top_%28Z80329_MC0099A%29.jpg Source]
* ZILOG Zilog Z8400APS [https://www.cpcwiki.eu/imgs/9/91/CPC464_PCB_Top_%28Z70100%29_GA40007-4.jpg Source]* ZILOG Zilog Z0840004PSC [https://www.cpcwiki.eu/imgs/8/88/CPC464_MC0044B_PCB_Top.jpg Source]
All the Z80 CPUs that have been used on CPC and Plus machines are NMOS. [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/z80-cpu-nmos-or-cmos/ Source]