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Nord-10 was a medium-sized general-purpose 16-bit minicomputer designed for multilingual time-sharing applications and for real-time multi-program systems, produced by Norsk Data. It was introduced in 1973. The later follow up model, Nord-10/S, introduced in 1975, introduced CPU cache, paging, and other miscellaneous improvements. The CPU had a microprocessor, which was defined in the manual as a portmanteau of "microcode processor" - not to be confused with the then nascent microprocessor. The CPU additionally contained instructions, operator communication, bootstrap loaders, and hardware test programs, that were implemented in a 1K read-only memory. The microprocessor also allowed for customer specified instructions to be built in. Nord-10 had a memory management system with hardware paging extending the memory size from 64 to 256K 16-bit words and two independent protecting systems, one acting on each page and one on the mode of instructions. The interrupt system had 16 program levels in hardware, each with its own set of general-purpose registers. ''Note:'' Much of the following information is taken from a document written by Norsk Data introducing the Nord-10. Some information, particularly about the memory system, may not be accurate for the later Nord-10/S. == The CPU == The CPU consisted of a total 24 printed circuit boards. The last eight positions in the rack were used for I/O devices operated by program control, such as the console Teletype, punched paper tape and punched card reader and punch, line printer, display, operator's panel, and the real time clock. The Nord-10 had 160 registers, of which 128 were available to programs, eight on each of the 16 program levels. Six of those registers were general registers, one was the program counter, and the other contained status information. Floating point operations were standard. The instructions could operate on five different formats, a bit, an 8-bit byte, 16-bit words, 32-bit double words, and 48-bit floating point words. 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「Nord-10」の詳細全文を読む スポンサード リンク
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