DEL Delete Program Step.   With the switch set to W/PRGM, gDEL   (1) deletes the program step denoted by the program pointer, (2) moves all the following steps, up one step, and (3) inserts a gNOP code in the vacated bottom position of memory.   When switched to RUN, gDEL acts only as CLx.   gDEL can be used to back up the pointer (after which you reinsert the deleted codes).   If memory is full (i.e., a minus sign shows in display), gDEL causes the bottom memory step to be lost.   If the program pointer is at the bottom (i.e., two minus signs show in display), gDEL deletes two locations. PRGM Clear Program Memory.   In program mode, fPRGM or f-1 PRGM clears the entire program memory to “no operation” codes (35 01), leaving the pointer at the top of the memory.   In run mode, fPRGM is equivalent to CLx.