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IBM System/370 Model 155: Difference between revisions

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Some said" means "the author of the Computerworld column said", so use it as a reference. Remove a non-reference footnote whose relevance is not clear (other than that, as noted in the "Virtual memory" section, those two models, unlike all subsequent models, needed an expensive hardware upgrade to support VM). The "not real 370s" applied to the 155 and 165, not the 145, which already had the hardware necessary for VM, and only needed a microcode update.
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and https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3195.html</ref> They were the first three models of the [[IBM System/370]] line of computers.
 
Three months later a fourth IBM System/370, the [[IBM System/370 Model 145|Model 145]], was announced. Since none of them came with [[virtual memory]], "which was to be a hallmark of the 370 line",<ref name="what-course-for-the-3081">{{cite news|newspaper=Computerworld|date=November 24, 1980|page=34|url=https://books.google.com/books?id=cKmJJd7R8PIC&pg=PA34|title=What Course for the 3081?}}</ref> some said about these early members of the [[IBM System/370]] family, especially about the 165155 and 155165, that they were not "the real 370 line."<ref groupname="NB">The 195 was noted as "at what-course-for-the time of its introduction, ... IBM's most powerful computing system-3081" and the 145's [[microcode]] could be upgraded from a floppy disk. By contrast, the 155 and 165 needed a hardware addition priced at $200,000 and $400,000 respectively</ref>
 
Three months later a fourth IBM System/370, the [[IBM System/370 Model 145|Model 145]], was announced.
 
==Limitations==
Some said about these early members of the [[IBM System/370]] family, looking back, that they were not "the real 370 line" because
"neither offered virtual storage capability, which was to be a hallmark of the 370 line."<ref name="what-course-for-the-3081">{{cite news|newspaper=Computerworld|date=November 24, 1980|page=34|url=https://books.google.com/books?id=cKmJJd7R8PIC&pg=PA34|title=What Course for the 3081?}}</ref>
 
The 370/155 was described as able to "run under [[DOS/360 and successors|DOS]]." Both the 155 and the larger 370/165 could "run under [[OS/360 and successors|OS/360]]." Being members of the System/370 family, the Model 155 and Model 165 were compatible with each other. Neither machine, as announced, could run a virtual memory operating system.
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