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IBM System/370 Model 155: Difference between revisions

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→Upgrade option: Use {{cite newspaper}} for the Computerworld reference, and give a Google Books URL.
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===Upgrade option===
In 1972 an upgrade option was announced "to provide the hardware necessary to operate in a virtual memory mode."<ref>{{cite newspaper|nespapernewspaper=Computerworld|date=August 15, 1973|page=17|title=First IBM DAT Box Installed|url=https://books.google.com/books?id=T3qky0Z-gc0C&pg=PA17#v=onepage&q&f=false}}</ref>
 
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
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