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Guy Harris (talk | contribs) →96K upgrade: Add, as a reference, an IBM manual that, according its entry in the IBM bibliography at http://www.bitsavers.org/pdf/ibm/360/bibliography/GA22-6822-21_System_360_and_System_370_Bibliography_Sep74.pdf, indicates that there are RPQs to allow expanding the memory on an M30 to 96k. |
Guy Harris (talk | contribs) →96K upgrade: Attach that reference to the right place. |
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===96K upgrade===
In response to competitive pressures, IBM introduced a memory upgrade option, allowing 96K on a 360/30.<ref>A posted submission to Ed Thelen's 360/30 writings (http://ed-thelen.org/comp-hist/ibm-360-30.html) from December 2005, labeled "Historical Note", indicated that, in response to a 128K offering by a small company, IBM actually introduced an upgrade, allowing 96K on a 360/30. The author noted that this allowed hour-plus tape/disk-based sorts to be done in-core in minutes.</ref><ref>{{cite book|title=IBM System/360 Model 30 Storage Expansion Feature Manual: RPQ's EA3807, EA1527; or RPQ's Y91283 and Y91325 (World Trade)|id=GA24-3564}}</ref> It seems, based on the system's front panel, that a provision for supporting more than 64K had been pre-planned.<ref>http://www.ljw.me.uk/ibm360/links has an entry named '''Glenn's Computer Museum''' (http://www.glennsmuseum.com/ibm/ibm.html) that has the following annotation: note that this front panel has indicators for extra address bits to allow more than 64k main storage
==Microcode==
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