ai2logo.i is the original file
ai2logo.imp is converted to imp80, checked and cleaned up with my formatter
ai2logo.imp.html is the above, syntax coloured for html
ai2logo.imp80 is minimally edited from ICL4/75 imp (aka Imp9)
  to Emas2900 imp (aka Imp80) and checked with PDS's imp80 compiler on windows

imp80-diffs are the differences between .i and .imp80

imp77-errs are the errors from running ai2logo.imp80 through the imp77 f/e