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JCTsay
計算機史
(第三代電子計算機)
nIBM System/360 Characteristics
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qIBM 系統/370(IBM System/370；1970)
n1970年 IBM公司推出了System/370計算機系統。其設計理念同System/360計算機系統，只是採用了更新的大型積體電路技術使得一台370可抵三、四台360 而價格增加不多。 System/370 也涵蓋了各種性能的機型
Model 30 40 50 60 67* 70
Main memory
       cycle time(微秒) 2.0 2.5 2.0 2.0 0.75 1.0
       word length(拜) 1 2 4 8 8 8
       capacity(千拜, min-max) 8-64 16-256 64-256 128-512 128-1024 256-512
CPU characteristics
       cycle time(微秒) 1.0 0.625 0.5 0.25 0.2 0.2
       relative computing speed 1 3.5 10 21 27 50
Input/Output  channel
    selector channel
       number attachable 2 2 3 6 6 6
       data rate(千拜/秒) 250 400 1250 1250 - 1250
    multiplex channel
       number attachable 1 1 1 0 1 0
       number of subchannels 96 128 256 196
       data rate(千拜/秒,interleaved) 16 30 40 -
       data rate(千拜/秒, burst) 200 200 200 -
*Mode 67 was introduced in April, 1965 for the purpose of time sharing. It includes features of
 multiprocessing, multiprogramming, and dynamic address translation.