Between the years 1979 and 1983, although no new versions of the Apple II were released, it enjoyed a broad popularity and annually increasing sales. The open architecture of the computer, with its fully described hardware and firmware function via the Reference Manual, made it appealing both to hardware and software hackers. Third-party companies designed cards to plug into the internal slots, and their function varied from making it possible to display and use 80-column text, to clocks and cards allowing the Apple II to control a variety of external devices. With extra peripherals for different floppydrives. Tested and working. Be aware of the high shipping costs. Caused by the size and dimensions.