intro − introduction to prom entry points The prom monitor provides a number of entry points to allow operating systems to return control to the prom monitor or boot a new copy of the operating system.  Other entry points are provided to allow modification of the prom monitor’s non-volatile ram and perform read-modify-write cycles on the VME bus.  s − single instruction execution, enters subprocedures
S − single instruction execution, steps over subprocedures [ count ]
[ count ] and allow single instruction execution of client code. executes a single ins