Originally posted by NickFitz
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If I recall (correctly) I used to work on the predecessor to this, called RTEMS which was primarily written in Fortran and ran on Siemens 330 (or H30) computers. There were a number of them which handled various tasks such as telemetry data, launch and early orbit and spacecraft control. Data from them was fed into an IBM mainframe which unlike most mainframes basically ran a real time system rather than batch or OLTP. Eventually the software was ported to run on Sun Sparc and other systems as the Siemens were pretty much obsolete by then. Interesting times
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