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The BT Merlin M4000 was a Personal computer sold by British Telecom during the 1980s as part of the Merlin range of electronic machinery for businesses. It was not developed by BT but was a rebadged Logica VTS-2400 Kennet, and a completely different machine from the Merlin Tonto which was a rebadged ICL OPD. Merlin M4000 was designed as a general purpose computer but was not IBM PC compatible, and so could not run the major business applications around at the time as these were tied to the IBM PC hardware. ==Hardware== Merlin M4000 computers were packaged inside a substantial and heavy steel desktop case weighing approximately 12 kg. Inside the case was the main board, power supply, floppy and hard drives, and expansion cards. The design was reasonably modular as the case and main board were able to accommodate expansion cards and additional memory. A separate keyboard with 114 keys connected to the main unit using a reversed British telephone plug with the clip on the left hand side. Most monitors were amber monochrome but later colour screens were sold. An 8086 CPU was used. The maximum RAM was 768 KB, made up of 256 KB on the main board plus two additional 256 KB RAM cards. A security socket was located on the rear of the main unit although it is unclear how it was used in practice. Networking was accomplished using ARCNET or Cambridge Ring (computer network) LAN cards. An RS-232 optical fibre modem was also available. The M4204T and M4213T computers were TEMPEST certified〔BT Brochure - TEMPEST, System Solutions from British Telecom〕 to BTR/01/202(4). 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「Merlin M4000」の詳細全文を読む スポンサード リンク
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