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The IBM 3705 Communications Controller is a simple computer which attaches to an IBM System/360 or System/370. Its purpose is to connect communication lines to the mainframe channel. It was a first communications controller of the popular IBM 37xx series. It was announced in March 1972. Designed for semiconductor memory which was not ready at the time of announcement, the 3705-I had to use 1.2 microsecond core storage; the later 3705-II uses 1.0 microsecond SRAM. Monolithic System Technology components, similar to those in S/370, were used. The 3705 normally occupies a single frame two feet wide and three feet deep. Up to three expansion frames can be attached for a theoretical capacity of 352 half-duplex lines and two independent channel adapters. The 3704 is an entry level version of the 3705 with limited features. ==Purpose== IBM intended it to be used in three ways: # Emulation of the older IBM 2703 Communications Controller and its predecessors. The relevant software is the ''Emulation Program'' or EP. # Connection of Systems Network Architecture (SNA) devices to a mainframe. The relevant software is ''Network Control Program'' (NCP). When used in this fashion, the 3705 is considered an SNA PU4. # Combining the two methods above in a configuration is called a ''Partitioned Emulation Program'' or PEP. 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「IBM 3705 Communications Controller」の詳細全文を読む スポンサード リンク
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