29 IF LSN$>="1" AND LSN$<="4" THEN OPEN"o",#1,"data.dat":WRITE#1,MONO,LSN$,1:CLOSE:CHAIN "a"+LSN$,,ALL
30 IF LSN$="I" OR LSN$="i" THEN RUN"INDEX"
31 IF LSN$="T" OR LSN$="t" THEN RUN"CONTENTS"
32 IF LSN$<>"X" AND LSN$<>"x" THEN LOCATE 19,25:BEEP:PRINT "Press";:COLOR C1,C2:PRINT " K 1 2 3 4 I T ";:COLOR C2,C1:PRINT "or";:COLOR C1,C2:PRINT " X ";:COLOR C2,C1:PRINT "please.":GOTO 26
33 COLOR C1,C2:CLS:PRINT TAB(9);"You are about to exit the BASIC Prof program. You will be returned to";"the Disk Operating System (DOS). To get back into BASIC, type BASICA and"
34 PRINT "press the return key. To get back to the BASIC Prof just turn the computer off";"for a few seconds, then turn it back on again."
35 LOCATE 6,1:PRINT "Press the ";:COLOR C2,C1:PRINT "space bar";:COLOR C1,C2:PRINT " to exit the program, or any other key to return to the menu."