Imp77 V10.2 was the final Vax/VMS release - we have library sources but not the compiler source.

See https://history.dcs.ed.ac.uk/archive/languages/imp77-tmp/vax-vms/imp-vax-vms-10-2/


There is a second Vax/VMS build of Imp77 (V08.02) at https://history.dcs.ed.ac.uk/archive/staging-area/EDINBURGH_REUNION/imp77-vax/

Finally, a scanned copy of a "recode" for the vax is at:

  https://gtoal.com/history.dcs.ed.ac.uk/archive/staging-area/EDINBURGH_REUNION/Mike%20McEwan/vaxcode%20via%20mike%20mcewan/

- anyone trying to reconstitute the program from that listing should be pleasantly surprised to
discover that 90% of the code is identical to code that can be found in:

  https://history.dcs.ed.ac.uk/archive/os/emas/users/ercc07/emas-2900/vaxsim2.txt

- it should be the work of an evening to cut & paste the common code and
type in the missing parts!