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The Mac286 was an Intel 80286-based MS-DOS coprocessor expansion card for one of Apple Computer's first expandable Macintosh computers, the 1987 Macintosh II. It was developed by Phoenix Technologies under contract to Apple Computer and sold by AST Research in an effort to close the gap between the Macintosh and IBM PC computing worlds. AST also introduced the related Mac86 card for the Macintosh SE. By 1989, AST had left the Apple market and sold the rights and technologies for the Mac286 and Mac86 cards to Orange Micro. Orange Micro would later make a successful line of coprocessor cards based on the 80x86 processor family, before leaving the coprocessor market to concentrate on USB and FireWire products. In 1992, Orange Micro discontinued the Mac286 board. Support for the card was discontinued sometime later. ==The Mac286 hardware== There are three distinct versions of the Mac286 hardware: *The original AST version consists of a pair of full-length NuBus cards, joined by two ribbon cables. The first board consists of a CPU card while the second board acts as a disk controller and memory card. *The early Orange Micro version is similar to the AST version. It was reworked in some areas and contains additional circuitry, permitting memory upgrades. *The later Orange Micro version consists of a single board with a greater degree of VLSI chips. Of the three versions, the AST appears to be the most common. 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「Mac286」の詳細全文を読む スポンサード リンク
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