Ondea User Guide select the input EXE file by clicking on the Input file button detailed info about the selected info file appears in the Execution Log, and the Base of Code and Size of Code values are automatically updated: Ondea will scan the input file searching for FWaits starting at Base of Code up to (Base of Code + Size of Code) select the output EXE file by clicking on the Output file button click on the Go! button: when Ondea finds a FWait opcode ($9B), it goes backwards searching a matching FP instruction: if a suitable one is found, then the current byte is actually a FWait and it is replaced by a Nop opcode ($90), otherwise it is skipped.