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Line 15: The IBM System/360 architecture was described as having been "extended, but not redesigned, for System/370."<ref name=IBMarc.165/> ~~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]].~~ ===Upgrade option===

IBM System/370 Model 155: Difference between revisions