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| discontinued = | unitssold = | unitsshipped = | media = | os = IBM PC DOS with custom icon-oriented shell interface | power = Battery: 9.6v/2400mAh (NiCd) Power supply: 15 VDC, 2.7A. | cpu = Intel 80c88 CPU @ 4.77 MHz | storage = Dual 720 kB 3.5" floppy drives | memory = 256 kB of RAM (expandable to 640 kB) | display = Monochrome CGA-compatible LCD screen. | graphics = 80x25 (text), 640x200, and 320x200 | sound = | input = | location = | controllers = | output = | camera = | touchpad = | connectivity = | service = | dimensions = | weight = 13 pounds (5.8 kg) | topgame = | compatibility = | predecessor = | successor = IBM PS/2 L40 SX IBM PS/55 note | related = | website = }} The IBM PC Convertible is the first laptop computer released by IBM. Released on April 3, 1986, the Convertible was also the first IBM computer to use the 3.5" floppy disk which went on to become the standard. Like modern laptops, it featured power management and the ability to run from batteries. It was the follow-up to the IBM Portable and was model number 5140. It was replaced in 1991 by the IBM PS/2 L40 SX, and in Japan by the IBM Personal System/55note, which was the predecessor to the ThinkPad. ==Description== The PC Convertible used the CMOS version of the Intel 8088 CPU running at 4.77 MHz, 256 kB of RAM (expandable to 640 kB), dual 720 kB 3.5" floppy drives, and a monochrome CGA-compatible LCD screen at a price of $2,000. It weighed 13 pounds (5.8 kg) and featured a built-in carrying handle. The PC Convertible had expansion capabilities through a proprietary ISA bus-based port on the rear of the machine. Extension modules, including a small printer and a video output module, could be snapped into place. The machine could also take an internal modem, but there was no room for an internal hard disk. The concept and the design of the body was made by the German industrial designer Richard Sapper. Pressing the power button on the computer did not turn it off, but put the machine into a "suspend" mode. This avoided the long process of booting up. The CMOS 80c88 CPU has a static core, which means that it will hold its state indefinitely by stopping the system clock oscillator. It can resume processing when the clock signal is restarted, as long as it is kept powered. The CMOS 80C88 processor uses very little power while the clock signal is stopped. The screen was not very tall, so text characters and graphics were compressed vertically, appearing about half their normal height. The display could display twenty five rows of 80 column text and graphics modes of 640x200 and 320x200 pixels. Pressing a lever between the two floppy drives just below the display detached the entire screen from the unit. This feature allowed the convenient use of a full-size desktop monitor while at one's desk, an early forerunner of the "docking station" concept. 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「IBM PC Convertible」の詳細全文を読む スポンサード リンク
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