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The Amiga 2000, or A2000, is a personal computer released by Commodore in March 1987. It was introduced as a "big box" expandable variant of the Amiga 1000 but quickly redesigned to share most of its electronic components with the contemporary Amiga 500 for cost reduction. Expansion capabilities include two 3.5" drive bays (one of which was used by the included floppy drive) and one 5.25" bay that could be used by a 5.25" floppy drive (for IBM PC compatibility), a hard drive, or CD-ROM once they became available. The Amiga 2000 was the first Amiga model to allow expansion cards to be added internally. SCSI host adapters, memory cards, CPU cards, network cards, graphics cards, serial port cards, and PC compatibility cards were available, and multiple expansions could be used simultaneously without requiring an additional expansion cage like the Amiga 1000. The Amiga 2000 not only included five Zorro II card slots, the motherboard also had four PC ISA slots, two of which were inline with Zorro II slots for use with the A2088 Bridge board, which added IBM PC XT compatibility to the A2000. The Amiga 2000 was the most versatile and expandable Amiga computer until the Amiga 3000T was introduced four years later. ==Features== Aimed at the high-end market, the original Europe-only model adds a Zorro II backplane, implemented in programmable logic, to the custom Amiga chipset used in the Amiga 1000. Later improved models have redesigned hardware using the more highly integrated A500 chipset, with the addition of a gate-array called "Buster", which integrates the Zorro subsystem. This also enabled handoff of the system control to a coprocessor slot device, and implemented the full video slot for add-on video devices. Like the earlier Amiga 1000 and most IBM PC compatibles of the era, and unlike the Amiga 500, the A2000 came in a desktop case with a separate keyboard. The case was taller than the A1000 to accommodate expansion cards, two 3.5" and one 5.25" drive bays. The A2000's case lacks the "keyboard garage" of the Amiga 1000 but has space for five Zorro II expansion slots, two 16-bit and two 8-bit ISA slots, a CPU upgrade slot and a video slot. Unlike the A1000, the A2000's motherboard includes a battery-backed real-time clock. The Amiga 2000 offered graphics capabilities exceeded among its contemporaries only by the Macintosh II, which sold for about twice the price of a comparably-outfitted Amiga 2000 additionally equipped with the IBM PC Compatible Bridge board and 5.25" floppy disk drive (which was important for real-world interoperability at this time). Also like the A1000, the A2000 was sold only by specialty computer dealers. It was originally announced at a price of $1495 The A2000 was largely succeeded by the Amiga 3000 in 1990. The 3000 featured fewer options for internal expansion than the 2000 models, so Commodore supplemented the Amiga 3000 with the Amiga 3000T in 1991. 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「Amiga 2000」の詳細全文を読む スポンサード リンク
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