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The original IBM Personal Computer, with monitor and keyboard. The IBM Personal Computer, commonly known as the IBM PC, spanned multiple models in its first generation (including the PCjr, the Portable PC, the XT, the AT, the Convertible, and the /370 systems, among others), from 1981 to 1987.
The base model contains 64 KB of RAM and produces 40 columns for video output, while the Expanded Model, to which the base model can be upgraded, holds a total of 128 KB of RAM, supports 80-column video displays, and has a built-in floppy drive that loads 5¼-inch double-sided double-density disks with 360 KB of storage.
Initially, model 1 (4952, Model C), [4] model 3 (IBM 4953) and model 5 (IBM 4955, Model F [4]) processors were provided. Later processors were the model 4 (IBM 4954) and model 6 (IBM 4956). Don Estridge had been the lead manager on the IBM Series/1 minicomputer. He reportedly had fallen out of grace when that project was ill-received.
IBM Model 5 reformulates IBM Model 4 by enhancing the alignment model with more training parameters in order to overcome the model deficiency. [12] During the translation in Model 3 and Model 4 there are no heuristics that would prohibit the placement of an output word in a position already taken.
Products, services, and subsidiaries have been offered from International Business Machines (IBM) Corporation and its predecessor corporations since the 1890s. [1] This list comprises those offerings and is eclectic; it includes, for example, the AN/FSQ-7, which was not a product in the sense of offered for sale, but was a product in the sense of manufactured—produced by the labor of IBM.
The PS/ValuePoint (or just ValuePoint) personal computer was IBM's answer to the PC clone market, where the IBM PS/2 could not compete due to price and proprietary interfaces. Announced in October 1992 and withdrawn in July 1995, it was replaced by the IBM PC Series 300 .
In 2016 IBM introduced a new fix pack numbering scheme for Liberty to reflect a move to continuous delivery of Liberty in a single support stream – after V8.5.5.9, the Liberty numbering scheme was rebased starting at 16.0.0.2 to reflect Year and Quarter of the Liberty fixpack release.
On August 12, 1981, IBM released the IBM Personal Computer. [10] One of the most far-reaching decisions made for IBM PC was to use an open architecture, [11] leading to a large market for third party add-in boards and applications; but finally also to many competitors all creating "IBM-compatible" machines.