IBM System/370 Model 155: Difference between revisions

Revision as of 03:26, 27 December 2016

Revision as of 03:28, 27 December 2016

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Unlike [[IBM System/370 Model 145]] customers, who as early as June 1971 were able to merely add virtual memory capability with a simple [[microcode]] update from a floppy disk, those using what literature of the day at times called a "boat anchor" (if left as-is) needed to purchase expensive hardware<ref group="NB">$200,000 for the 155 and $400,000 for the 165</ref> to upgrade their machines, and even this had to

wait until 1972, at which time their upgraded 155 was known as an IBM System/370 Model 155-II.<ref>{{cite journal | author = A. Padegs (September| 1981).title = "System/360 and Beyond". | journal = IBM Journal of Research & Development. IBM.| volume = 25 (| issue = 5): | pages = 377–390. |date=September 1981 | publisher = IBM | doi: = 10.1147/rd.255.0377.}} –&ndash; tables include model characteristics (Table 1) and announcement/shipment dates (Table 2). The S/370-155-II and -165-II are listed under the former but not the latter, because the upgraded systems were not formally announced as separate models. The "System/370 Advanced Function" announcement, including the -158 and -168, was the main public event.</ref>

==See also==