There are several version of PDP-11 FIG-FORTH on the net, I'm trying to find the one from Marty Ewing originally DECUS 11-232, later for RT-11 The writeup for the RT-11 version shows up with a Google search https://manualzz.com/doc/20421230/forth-programming-system-rt11-decus-distr… FORTH PROGRAMMING SYSTEM RT11 DECUS Distribution Documentation File M. S. Ewing 18 October 1978 the files in it are: FORTH.DOC This file. FORTH.MAC Forth Macro source for the Forth "kernel" FORSYS.DAT Standard Forth text file XED.DAT Extended editor text BFP.DAT Basic floating point package EFP.DAT An extended floating point package MSG.DAT A minimal message file. I have some sources which use a Z80 threaded language called Terse that I believe is based on this kernel that I'm trying to archive (it's for some Bally arcade games)