BaseFix is an Eamon utility program written by Robert Plamondon in November 1981 included by John Nelson on the Eamon Utilities IV disk. The program modifies an adventure's Main Program for, as Plamondon describes it, "greater speed, better output format, and more consistent logic". Nelson writes in the disk documentation that he doesn't recommend using the program "since it makes your adventures incompatible with other enhancements planned."
Plamondon's program includes the following instructions: "To use, load base program for an adventure, then type
EXEC BASEMOD. Then resave the base program."