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COMPASS was the name of the assembler language for the earlier supercomputers that Seymour Cray designed while he was still working at CDC, such as the CDC 6000-series:

https://en.wikipedia.org/wiki/COMPASS

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I misremembered, I think the CTSS source was actually written in a language called LRLTRAN. I just remembered it was something obscure.

LLNL used to have LRLTRAN manuals online. It's an extended Fortran-66 for Systems Programming.

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