In Pictures: The Apple family tree

Apple II (1977 to 1993)

CPU class: MOS 6502 OS: Apple DOS, Apple Pascal, ProDOS Development status: Open Platform size: 7

When it came time to design a follow-up to the Apple I, Steve Wozniak drew on his love of video games to create the world’s least expensive color computer system. The Apple II retained the same 8-bit MOS 6502 CPU as its predecessor, but added a series of seven expansion slots that extended the lifespan of the platform. Oh, and it also included a case, a keyboard, and a power supply.

With seven major American variations on the Apple II platform, the Apple II became the center of an ecosystem populated by numerous first- and third-party software packages and accessories.