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The PowerBook Duo is a line of small subnotebooks manufactured and sold by Apple Computer from 1992 until 1997 as a more compact companion to the PowerBook line. Improving upon the PowerBook 100's portability (its immediate predecessor and Apple's third smallest laptop), the Duo came in seven different models. They were the Duo 210, 230, 250, 270c, 280, 280c, and 2300c, with the 210 and 230 being the earliest, and 2300c being the final incarnation before the entire line was dropped in early 1997. Weighing in at a mere 4.1 pounds and slightly smaller at than a sheet of paper, only thick, it was the lightest and smallest of all of Apple's PowerBooks of its time. Only the MacBook Air, the 13-inch Retina MacBook Pro and the 12-inch Retina MacBook weigh less, though they are wider and deeper (but considerably thinner). It is one of Apple's smallest notebooks overall. The Duo had the most in common with the original MacBook Air which only included one USB 2.0 port, one video port (requiring an adapter) and one speaker port, but no ability for expansion.〔 The PowerBook Duo line was replaced by the PowerBook 2400, which was slightly larger in size to the Duos, but still only the fifth smallest behind the PowerBook G4 which succeeded it as fourth smallest. Although both featured much more onboard functionality, they lacked docking ability. , the subnotebook Apple offers is the MacBook Air. ==Features== The Duo line offered an ultraportable design that was light and functional for travel and expandable via its unique docking connector. However certain compromises were made to achieve this level of portability. The Duo series used an 88% of standard desktop-sized keyboard which was criticized for being difficult to type on. Likewise the trackball was reduced in size from even that used on the PowerBook 100. The only usable port which came standard on the Duo was a dual printer/modem EIA-422 serial port. There was a slot for an expensive optional built-in 14.4 Express Modem and no provision for built-in Ethernet. This somewhat limited configuration meant the only way to move data in or out of the laptop in a stock configuration without purchasing additional accessories was via a relatively slow AppleTalk connection, which was not practical in the event of hard drive problems. Compensating for these limitations, the initial Duo offering provided for a considerably larger RAM limit of 24 MB (to the 100 series' 14 MB), and a standard 80 MB hard drive (to the 100's 40 MB). The debut year for the duo only offered a passive matrix display on both the mid-level and high-end models. In contrast to the high end of the 100-series line with which the Duos shared the same processors, the PowerBook 170 and 180 with their crisp active matrix displays were both already in great demand over the lower powered models with passive matrix displays. The following year, Apple replaced the earlier models with both an active matrix display and a color active matrix display, the latter becoming the de facto standard of the PowerBook line. The respective Duo models are easily differentiated by their display method and processor. All other features are identical. 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「PowerBook Duo」の詳細全文を読む スポンサード リンク
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