900 PRINT USING "MUTUAL IMPEDANCE BETWEEN THE DIPOLES IS ###.###";R21;:PRINT SIGN$;:PRINT USING "###.###";ABS(X21)
910 COLOR 15,0:LOCATE 25,18:PRINT "R - Run Again E - End S - Start Program ";CHR$(29);:COLOR 7,0
920 AN$=INKEY$
930 IF AN$="R" OR AN$="r" THEN RUN
940 IF AN$="E" OR AN$="e" THEN LOCATE 23,1:END
950 IF AN$="S" OR AN$="s" THEN RUN "START
960 GOTO 920
970 :
1500 SCREEN 0,0,0:SOUND 1510,10:COLOR 7,0:LOCATE 25,10:PRINT "Key: Esc to End or `R' to Run Again or `S' to Return Start";CHR$(29);:COLOR 15,0:LOCATE 25,15:PRINT "Esc";:LOCATE 25,30:PRINT "R";:LOCATE 25,50:PRINT "S";CHR$(29);:COLOR 7,0
1510 E$=INKEY$:IF E$="" THEN 1510 ELSE IF E$=CHR$(27) THEN CLS:END ELSE IF E$="R" OR E$="r" THEN RUN ELSE IF E$="S" OR E$="s" THEN RUN "START
1520 GOTO 1510
1600 '//////////////// Routine to Draw a Box //////////////////