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    The TI-990 is one of the better preserved minicomputers of the era. http://www.cozx.com/dpitts/ti990.html is a great resource for TI-990 emulation, including almost all the supported operating systems of the time, DX10, DNOS, TXDS, FOCAL, FORTH990, UCSD Pascal, and UNIX V6. There is a huge wealth of information at http://bitsavers.trailing-edge.com/pdf/ti/990/ and http://bitsavers.trailing-edge.com/bits/TI/990/ has a rather complete archive of OEM software, sans the applications that these systems generally ran, which were usually custom and proprietary.