A vintage computer is an older computer system that is largely obsolete. The personal computer has been around since approximately 1971. But in that time, numerous technological revolutions have left generations of obsolete computing equipment on the junk heap. Nevertheless, in that time, these otherwise useless computers have spawned a sub-culture of vintage computer collectors, who often spend large sums to acquire the rarest of these items, not only to display but restore to their fully functioning glory, including active software development and adaptation to modern uses. This often includes so-called hackers who add on, update and create hybrid composites from new and old computers for uses for which they were otherwise never intended. Ethernet interfaces have been designed for many vintage 8-bit machines to allow limited connectivity to the Internet; where users can access user groups, bulletin boards, and databases of software. Most of this hobby centers on those computers manufactured after 1960, though some collectors specialize in pre-1960 computers as well. MITS Inc. Micro Instrumentation and Telemetry Systems (MITS) produced the Altair 8800 in 1975, which is widely regarded as starting the microcomputer revolution. IMSAI IMSAI produced a machine similar to the Altair 8800, though considered by many to be a more robust design. Processor Technology Processor Technology produced the Sol-20. This was one of the first machines to have a case that included a keyboard; a design feature copied by many of later "home computers". SWTPC Southwest Technical Products Corporation (SWTPC) produced the SWTPC 6800 and later the SWTPC 6809 kits that employed the Motorola 68xx series microprocessors. The 68xx line was to be followed later by the 6502 processor that was used in many early "home computers", such as the Apple II. Apple Inc. The earliest Apple Inc. personal computers are among some of the most collectible. They are relatively easy to maintain in an operational state thanks to Apple's use of readily available off-the-shelf parts. Apple I: The Apple-1 was Apple's first product and has brought some of the highest prices ever paid for a microcomputer at auction. Apple II: The Apple II series of computers are some of the easiest to adapt, thanks to the original expansion architecture designed for them. New peripheral cards are still being designed by an avid thriving community, thanks to the longevity of this platform, manufactured from 1977 through 1993. Numerous websites exist to support not only legacy users