146  IF  NOT NH THEN NH = 9
 147 VT =  PEEK (37):HT =  PEEK (36): INPUT V$:V =  VAL (V$): IF V <  = NH AND V >  = NL THEN 149
 148  VTAB VT + 2: INVERSE : PRINT " MUST BE BETWEEN ";NL;" AND ";NH;" ": NORMAL : FOR X = 1 TO 1600: NEXT : VTAB VT + 2: CALL  - 868: VTAB VT + 1: HTAB HT + 1: GOTO 147
 149  RETURN