Analysis of information sources in references of the Wikipedia article "Apple II (original)" in English language version.
The first motherboard-only Apple II computers shipped on May 10, 1977, for those who wanted to add their own case, keyboard, and power supply (or wanted to update their Apple-1 'system' with the latest and greatest). A month later, on June 10, 1977, Apple began shipping full Apple II systems.
Several manufacturers, however, make Z80 coprocessor boards that plug into the Apple II.
The first motherboard-only Apple II computers shipped on May 10, 1977, for those who wanted to add their own case, keyboard, and power supply (or wanted to update their Apple-1 'system' with the latest and greatest). A month later, on June 10, 1977, Apple began shipping full Apple II systems.
Several manufacturers, however, make Z80 coprocessor boards that plug into the Apple II.