Initialises the DMS display.
2=to: 2!:}Format: RECOVER
2=to: 2!:}Synonym: START-DISPLAY
2=to: 2!:}Comments: This can be used if the display hangs up or if the lookup table or cursor position appear to be corrupted. It can sometimes, but not usually, recover from the Opal board crash, when the display screen goes blue. It does not affect the data.