Your purchase of the Commodore Z80 add-on microprocessor cartridge puts you in the elite group of owners of a dual processor home microcomputer.  No one but Commodore the originator of the home microcomputer - could design and manufacture an inexpensive home or personal computer that accommodates the two most common microprocessors in the microcomputer industry:

• the Commodore MOS 6510 (6502 type) microprocessor

• the Z80A microprocessor