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The Commodore SX-64, also known as the Executive 64, or VIP-64 in Europe, is a portable, briefcase/suitcase-size "luggable" version of the popular Commodore 64 home computer and holds the distinction of being the first full-color portable computer.〔(Commodore SX-64 Portable )〕 The SX-64 features a built-in five-inch composite monitor and a built-in 1541 floppy drive. It weighs (). The machine is carried by its sturdy handle, which doubles as an adjustable stand. It was announced in January 1983 and released a year later, at (about $2,250 in 2014).〔(Commodore SX-64 portable computer )〕〔 "(Richards, Commodore USA president, ) also said that the SX-64 computer, a $995 portable version of the Commodore 64 with built-in color monitor, has been a sellout everywhere."〕 == Description == Aside from its built-in features and different form factor, there are several other differences between the SX-64 and the regular C64. The default screen color is changed to blue text on a white background for improved readability on the smaller screen. This can cause compatibility problems with programs that assume the C64's default blue background. The default device for load and save operations is changed to the floppy drive. The Datasette (cassette) port and RF port were omitted from the SX-64. Because it has a built-in disk drive and monitor, Commodore did not perceive a need for a tape drive or television connector. However, the lack of a Datasette port poses a problem for a number of C64 Centronics parallel printer interfaces, since several popular designs "borrowed" their +5V power supply from the port. This was not an issue for later interfaces which were supplied with an AC adapter power supply, or those which can use the +5V line supplied by the Centronics port (Pin #18) on the printer itself, if the printer implements it. Alternatively, a +5V supply is also available from the joystick ports. The audio/video port is still present, so an external monitor can still be used; it and the built-in monitor display the same content. Differences electrically and in placement on the board, means that there are compatibility problems with some C64 cartridges. The original SX-64's (built in) power supply limits the machine's expandability. Compatibility with Commodore RAM Expansion Units varies. Early SX-64 power supplies cannot handle the extra power consumption from the REU. The physical placement of the cartridge port can prevent the REU from seating properly. The 1700 and 1750, 128K and 512K units intended for the C128, are said to work more reliably with the SX-64 than the 1764 unit that was intended for the regular C64. Some SX-64 owners modify Commodore REUs to use an external power supply in order to get around the power supply issues. A version of the SX-64 with dual floppy drives, known as the DX-64, was announced, but the press reported by early 1985 that plans for its release had been suspended. A few have been reported to exist, but it is very rare. Instead of an extra floppy drive, a modem could also be built in above the first drive. Some hobbyists installed a second floppy drive themselves in the SX-64's empty drive slot. Later SX-64 units (from GA4 and on) use the larger power supply intended for the DX-64. A version with a monochrome screen called the SX-100 was announced but never released. 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「Commodore SX-64」の詳細全文を読む スポンサード リンク
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