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The GE-200 series was a family of small mainframe computers of the 1960s, built by General Electric. GE marketing called the line ''Compatibles/200''. The main machine in the line was the GE-225. It used a 20-bit word, of which 13 bits could be used for an address. Along with the basic CPU the system could also include a floating-point unit, or a fixed-point decimal option with three 6-bit decimal digits per word. It had 11 I/O channel controllers, and GE sold a variety of add-ons including disks, printers and other devices. The machines were built using discrete transistors, with a typical machine including about 10,000 transistors and 20,000 diodes. They used core memory, and a standard 8k-word system held 186,000 magnetic cores. The GE-215 was a scaled-down version of the GE-225, including only 6 I/O channels and only 4K or 8K of core. The GE-235 was a re-implementation of the GE-225 with three times faster memory than the original. The GE-235 consisted of several major components and options: * Central processor * 400 CPM or 1000 CPM card reader * 100 CPM card punch or 300 CPM card punch * Perforated tape subsystem * Magnetic tape subsystem * 12 Pocket high-speed document handler * On-line high speed printer or Off/on-line speed printer * Disc storage unit * Auxiliary Arithmetic Logic Unit (ALU) * DATANET data communications equipment ==Background== The series was designed by a team led by Homer R. “Barney” Oldfield, and which included Arnold Spielberg (father of film director Steven Spielberg). GE chairman Ralph J. Cordiner had forbidden GE from entering the general purpose computer business, rejecting several proposals by Oldfield by simply writing "No" across them and sending them back. Oldfield, somewhat deceptively, claimed that the GE-200 series would be industrial control computers. By the time Cordiner found out otherwise, it was too late and the machine was in production (Cordiner fired Oldfield at the product rollout). Even though the machine was selling well, Cordiner ordered that GE leave the computer business within 18 months (it actually took several years). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GE-200 series」の詳細全文を読む スポンサード リンク
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