English: 4.3 BSD from the University of Wisconsin, running in the SIMH VAX-11/780 simulator with 16MB memory. The system describes itself as "4.3 BSD UNIX" and "4.3+NFS", and it dates to around January 1987. Reading the manual page for "f77" (FORTRAN 77 compiler).
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There are only 132 distinct colors present in the image. This means we can use an 8-bits-per-pixel Palette mode encoding. I performed this transformation using OxiPNG and ZopfliPNG.