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Z-2 is the name of a series of microcomputers made by Cromemco, Inc. which were introduced to the market in the middle to late 1970s. They were originally available in assembled or kit form to serve both a commercial market and the computer enthusiast market. Later the machines were only available factory-assembled. These Cromemco machines were widely respected for their speed, configurability, durability, and reliability. The Cromemco Z-2 computer was a Z80 based microcomputer system introduced in 1977. The original Z-2 in kit form included a ZPU-K Z80 CPU card, S-100 bus motherboard, all-metal rack-mount chassis and dust case, card socket and card guide; The assembled form included in addition a complete set of sockets and card guides, and a cooling fan. The Z-2 series was capable of supporting up to 21 S-100 boards and could be configured with any of the boards supplied by Cromemco.〔Cromemco Z-2 Instruction Manual, Cromemco,Inc. Part No. N/A, 1977〕 The Z-2 gave an impression of solidity due to its hefty 450-watt power supply and heavy metal chassis. A TU-ART (dual serial and parallel board), 4FDC Floppy Disk Controller, one or more 16KZRAM cards, and a Wangco 5¼" floppy disk drive would be added to form a basic system. An unusual feature of the Z-2 was switch selectable CPU speed; 250 or 500 nanosecond cycle time were provided. The ZPU speed was 4 MHz at a time when less than 2 MHz was normal, and boards from other manufacturers might still require the slower speed. The ZPU card in the Z-2 could address up to 64 kilobytes of RAM. However, the 16KZ memory card supported bank-switching with 8 banks of 64 kilobytes each. When using the 16KZ, the maximum RAM of the Z-2 was limited by the available S-100 slots. If 16 of the slots were occupied by 16KZ cards, then the system had 4 banks of 64 kilobytes each, for a total of 256 kilobytes. Additional S-100 slots were required for cards controlling peripherals, disk drives, and I/O interfaces. Communication with the processor was normally performed through a TU-ART or other S-100 bus compatible interface card, which could run a CRT terminal or teletype. ==Cromemco Z-2D== The Cromemco Z-2D computer was a Z80 based microcomputer system which differed from a Z-2 by having one or two Wangco 5" disk drives, a disk power supply and a 4FDC disk controller in a Z-2 chassis. The Z-2D was available in assembled and kit form. The Z-2D was also called the "System Two". 〔Cromemco Z-2D Instruction Manual, Cromemco,Inc. Part No. 0023-0014, 1978〕 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「Cromemco Z-2」の詳細全文を読む スポンサード リンク
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