Roger Taylor wrote: > Which of these needs to be used in the the boot module for Level Two? > > os9 F$BtMem > os9 F$SRqMem > The OS-9 manual says, "This call is identical to F$SRqMem." NitrOS-9 now calls F$BtMem with LevelII but F$SRqMem with LevelI. Roger, your code is for LevelII so continue to use F$BtMem.