but new adopters who weren't even born when the Apple II was discontinued by Apple. Macintosh: Perhaps because of its friendly design and first commercially successful graphical user interface as well as its enduring Finder application that persists on the most current Macs, the Macintosh is one of the most collected and used vintage computers. With dozens of websites around the world, old Macintosh hardware and software are put into daily use. Many maintain vast collections of functional and non-functional systems, which are lovingly maintained and discussed on worldwide user forums. The Macintosh had a strong presence in many early computer labs, creating a strong nostalgia factor for former students who recall their first computing experiences. RCA The COSMAC ELF in 1976 was an inexpensive (about $100) single-board computer that was easily built by hobbyists. Many people who could not afford an Altair could afford an ELF, which was based on the RCA 1802 chip. Because the chips are still available from other sources, modern recreations of the ELF are fairly common and there are several fan websites. IBM The IBM 1130 computing system from 1966 still has a following of interested users, albeit via an emulator rather than the actual machine. The 5100 also has an avid collector and fan base. The PC series (5150 PC, 5155 Portable PC, 5160 PC/XT, 5170 PC/AT) has become very popular in recent years, with the earliest models (PC) being considered the most collectible. Acorn BBC & Archimedes The Acorn BBC Micro was a very popular British computer in the 1980s with home and educational users and enjoyed near-universal usage in British schools into the mid-1990s. It was possible to use 100K -inch disks, and it had many expansion ports. The Archimedes series the de facto successor to the BBC Micro has also enjoyed a following in recent years, thanks to its status as the first computer to be based around ARM's RISC microprocessor. Tandy/Radio Shack The Tandy/RadioShack Model 100 is still widely collected and used as one of the earliest examples of a truly portable computer. Other Tandy offerings, such as the TRS-80 line, are also very popular, and early systems, like the Model I, in good condition can command premium prices on the vintage computer market. Sinclair The Sinclair ZX81 and ZX Spectrum series were the most popular British home computers of the early 1980s, with a wide choice of emulators