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Commodore 264 : ウィキペディア英語版
Commodore Plus/4

The Commodore Plus/4 is a home computer released by Commodore International in 1984. The "Plus/4" name refers to the four-application ROM resident office suite (word processor, spreadsheet, database, and graphing); it was billed as "the productivity computer with software built-in".
Internally, the Plus/4 shares the same basic architecture as the lower-end Commodore 16 and 116 models, and is able to use software and peripherals designed for them. However, it is not compatible with the well-established Commodore 64.
While the Plus/4 had some success in Europe, it was a failure in the United States, where it was derided as the "Minus/60".
== Background ==

In the early 1980s, Commodore found itself engaged in a price war in the home computer market. Companies like Texas Instruments and Timex Corporation were releasing computers that undercut the price of Commodore's PET line. Commodore's MOS Technology division had designed a video chip but could not find any third-party buyers. The VIC-20 resulted from the confluence of these events and it was introduced in 1980 at a list price of $299.95. Later, spurred by the competition, Commodore was able to reduce the VIC's street price to $99, and it became the first computer (of any kind) to sell over 1 million units. The Commodore 64, the first 64-kB computer to sell for under , was another salvo in the price war but it was far more expensive to make than the VIC-20 because it used discrete chips for video, sound, and I/O. Still, the C64 went on to become a best-seller and was selling for $199 at the time of the Plus/4's introduction. Even while C64 sales were rising, Commodore president Jack Tramiel wanted a new computer line that would use fewer chips and at the same time address some of the user complaints about the VIC and C64.
Rumors spread in late 1983 of a new computer in 1984 called the "Commodore 444" or "Ted", with built-in word processing and spreadsheet software, and that it would be one of four new computers that would replace the VIC-20 and 64, which the company would discontinue. The company's third salvo — which, as it turned out, was fired just as most of Commodore's competition was leaving the home computer market — was the C116, C16, and 264, which became the Plus/4. There were also prototypes of a 232, basically a version of the Plus/4 without the software ROMs, and a V364 which had a numeric keypad and built-in voice synthesis. The latter two models never made it to production. All these computers used a 6502 compatible MOS 8501 that was clocked approximately 75% faster than the CPUs used in the VIC-20 and C64, and a MOS Technology TED all-in-one video, sound, and I/O chip. The Plus/4's design is thus philosophically closer to that of the VIC-20 than that of the C64.
The Plus/4 was the flagship computer of the line. The Plus/4 had of memory while the C16 and 116 had . The Plus/4 had built-in software, whereas the others did not. The Plus/4 and C16 had full-travel keyboards; the 116 used a rubber chiclet keyboard that was still superior to the flat membrane keyboards used on less-expensive Timex-Sinclair computers. The C116 was only sold in Europe. All of the machines were distinguished by their dark gray cases and light gray keys. This was a reversal of the color scheme on the 64 and VIC, which used lighter cases and darker-colored keys.
The Plus/4 was introduced in June 1984 and priced at 299 US$. It was discontinued in 1985. Commodore's intent with the Plus/4 was not to replace the C64, but to expand the home computer market and sell the Plus/4 to users who were more interested in serious applications than in gaming. By 1984, however, most of these customers were beginning to switch to the new, low-cost IBM PC compatibles such as the Leading Edge Model D and Tandy 1000 series. Although, like the Commodore B128, Plus/4 systems remained available from liquidators for years after its discontinuation, the Plus/4 disappeared from Commodore's major markets by 1988.
The Plus/4 was later used in Denmark, as part of a bundled product from the then-national telecompany (now TDC A/S) to help hearing-impaired people communicate over telephone lines. Outgoing calls were made from the Plus/4 via modem to a call center where a service assistant would read the written input from the user, call the other party and read the text aloud. Vice versa, incoming calls could be made from other users to the call center, who would dial the Plus/4 modem. A strobe light connected to the Plus/4 would notify the hearing impaired about the incoming call. The Plus/4 enjoyed lasting popularity in Hungary due to CBM's decision to saturate the Central European market with the failed product at a greatly reduced price. A number of unofficial ports of C64 games were produced by Hungarian users.〔http://yape.homeserver.hu/history.htm〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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