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Since the rise of the [[personal computer]] in the 1980s, [[IBM]] and other vendors have created '''PC-based IBM-compatible mainframes''' which are compatible with the larger IBM [[mainframes]]. They are also referred to as ''plug-compatible mainframes'', a term used for the original [[System/360]] and [[System/370|370]] compatible clones. The original advantage being that the PC-based mainfarmes had a much smaller footprint, required less power, and cost less money.
==Background==
Up until the late 1980s, mainframes were very large machines that often occupied entire rooms. The rooms were often air conditioned and had special power arrangements to accommodate [[three-phase electric power]] required by the machines.
==System/370==
The Personal/370 (aka P/370) is a single slot 32-bit [[Micro Channel architecture|MCA]] card that can be added to a [[IBM Personal System/2|PS/2]] or [[RS/6000]] computer to run System/370 OSs (like [[MUSIC/SP]], [[VM (Operating system)|VM]], [[VSE]]) parallel to [[DOS]] or [[OS/2]] (in PS/2) or [[AIX operating system|AIX]] (in RS/6000) supporting multiple concurrent users. It is a complete implementation of the S/370 Processor
==System/390==
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===P/390===
P/390 was the designation used for the expansion card used in an IBM PC Server and was less expensive than the R/390. The original P/390 server was housed in an IBM PC Server 500 and featured a 90 MHz [[Intel]] [[Pentium]] processor for running OS/2. The model was revised in mid-1996 and rebranded as the PC Server 520, which featured a 133 MHz Intel Pentium processor. Both models came standard with 32MB of [[RAM]] and were expandable to 256MB. The PC Server 500 featured eight
===S/390 Integrated Server===
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