IBM System/370 Model 155: Difference between revisions

Revision as of 15:20, 14 March 2024

Revision as of 15:25, 14 March 2024

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[[File:IBM System370 model 145 (I198005) (2).jpg|thumb|3 months after the announcement of <br>the 370/155 (and 165)<br> came the Model 145.<ref>{{cite web|url=https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3145.html|title=System/370 Model 145|website=IBM Archives|date=23 January 2003 |publisher=IBM}}</ref><br>Unlike the 155 (or 165), <br>the 145's lack of virtual memory could be rectified with a simple [[microcode]] update from a floppy disk, vs the others needing a hardware upgrade.]]

[[File:IBM_magnetic_disk_drives_3330+3333.png|thumb|The IBM 3330 <br>Direct Access Storage Facility, <br>code-named Merlin, was introduced in June 1970 for use with the IBM System/370. Its removable disk packs could hold 100 &nbsp;MB]]

The '''IBM System/370 Model 155''' (and the [[IBM System/370 Model 165|Model 165]])<ref name=IBMarc.165>{{cite web|url=https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3165.html|title=System/370 Model 165|website=IBM Archives|date=23 January 2003 |publisher=IBM}}</ref>

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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"/> some said about these early members of the IBM System/370 family, especially about the 165 &and 155, that they were not "the real 370 line."<ref group="NB">The 195 was noted as "at the time of its introduction, ... IBM's most powerful computing system" 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>

==Limitations==