IBM System/360 Model 67: Difference between revisions

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After a year of negotiations and design studies, IBM agreed to make a one-of-a-kind version of its S/360-65 mainframe computer for the University of Michigan. The S/360-65M<ref name=Topol30Years/> would include dynamic address translation (DAT) features that would support [[virtual memory]] and allow support for time-sharing. Initially IBM decided not to supply a time-sharing operating system for the new machine.

As other organizations heard about the project they were intrigued by the time-sharing idea and expressed interest in ordering the modified IBM S/360 series machines. With this demonstrated interest IBM changed the computer's model number to S/360-67 and made it a supported product. When IBM realized there was a market for time-sharing, it agreed to develop a new time-sharing operating system called [[TSS/360]] (TSSoperating stood forsystem)|IBM Time-sharing Sharing System]] (TSS/360) for delivery at roughly the same time as the first model S/360-67.

The first S/360-67 was shipped in May 1966. The S/360-67 was withdrawn on March 15, 1977.<ref>[http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS360.html "System/360 Dates and characteristics"] at IBM Archives > Exhibits > IBM Mainframes > Mainframes reference room > Mainframes basic information sources</ref>

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== Operating systems ==

*When the S/360-67 was announced in August 1965, IBM also announced [[TSS/360]], a time-sharing operating system project that was canceled in 1971 (having also been canceled in 1968, but reprieved in 1969). IBM subsequently modified TSS/360 and offered the TSS/370 [[Request price quotation|PRPQ]]<ref>{{cite manual

| title = TSS/370 User Data

| id = GX28-6400-3

| date = July 1978

| edition = Fourth

| url = http://bitsavers.org/pdf/ibm/360/tss/GX28-6400-3_TSS_370_User_Data_Jul78.pdf

| publisher = IBM

}}

</ref> for three releases before cancelling it.

:IBM's failure to deliver TSS/360 as promised opened the door for others to develop operating systems that would use the unique features of the S/360-67:

* [[Michigan Terminal System|MTS]], the Michigan Terminal System, was the time-sharing operating system developed at the University of Michigan and first used on the Model 67 in January 1967. Virtual memory support was added to MTS in October 1967. Multi-processor support for a duplex S/360-67 was added in October 1968.<ref>Pugh, ''op. cit., p.'' 364 &ndash; MTS on dual processor S/360-67 in 1968</ref>