SPECIAL-NAMES.
UPSI-0 ON STATUS IS T OFF STATUS IS F
UPSI-1 ON STATUS IS T OFF STATUS IS F
⋮
UPSI-7 ON STATUS IS T OFF STATUS IS F
IF T OF UPSI-0 DISPLAY "UPSI-0". IF T OF UPSI-1 DISPLAY "UPSI-1". ⋮ IF T OF UPSI-7 DISPLAY "UPSI-7".