IBM System/370 Model 155: Difference between revisions

Revision as of 03:33, 27 December 2016

Revision as of 05:24, 27 December 2016

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==Growth path==

The initially announced systems were in many ways merely improved [[IBM System/360|IBM 360]] systems. Both were announced as

running 360 [[Operating System]]s.<ref group="NB">DOS on the 155, MFT or MVT on either machine</ref>. No mention was made of [[virtual memory]]

or new operating systems.

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The 370 introduced some new instructions, such as MOVE CHARACTER LONG ('''MVCL''') and COMPARE CHARACTER LONG ('''CLCL'''),

thereby permitting operations on up to 2^24-1 bytes (16 MB), vs. the 256-byte limits on the 360's MVC and CLC.<ref>http://faculty.cs.niu.edu/~byrnes/csci360/notes/360ex.htm</ref>

,<ref>http://research.microsoft.com/en-us/um/people/gbell/tcmwebpage/timeline/chap51_ibm370_cs2.pdf</ref>, but lacked a

[[Memory management unit|DAT box]].