1984 hard drive and streamer tape data storage system for Apple II computers. System can connect to and be used by upto 4 home computers simultaneously. An early example of a home computer network, rare at the time as most networks relied on mainframe computers. The name HAL was a snub at IBM by using one letter ahead and the AI character in 2001 Space Odyssey was also called HAL. Comes complete with 4 interface cards, manuals and spare fan. Hard drive tested and works. No tape so streamer tape not tested. One on the four computer connections not working. International shipping at buyers cost.