307 IF MM$<>"1" AND MM$<>"2" AND MM$<>"3" AND MM$<>"4" AND MM$<>"5" AND MM$<>"6" AND MM$<>"7" AND MM$<>"8" AND MM$<>"9" AND MM$<>"a" AND MM$<>"A" AND MM$<>"b" AND MM$<>"B" AND MM$<>"c" AND MM$<>"C" THEN 305
310 'IF C < 1 OR C > 12 THEN 300
320 C=VAL(MM$): M$=CHR$(C)
330 IF MM$ = "A" OR MM$ = "a" THEN M$=CHR$(10): GOTO 1000
335 IF MM$ = "B" OR MM$ = "b" THEN M$=CHR$(11)
340 IF MM$ = "C" OR MM$ = "c" THEN 2000
500 PRINT#1,CHR$(0);CHR$(0);CHR$(0);CHR$(0);M$
510 GOTO 300
1000 ' FREQUENCY CONTROL
1010 CLS:PRINT
1020 INPUT " Frequency MHz";A
1030 IF A < .5 OR A > 29.99999 THEN 1010
1040 GOSUB 1700
1050 CLS: COLOR 0,7: LOCATE 1,14: PRINT USING" ##.##### \ \";A;" MHz": COLOR 7,0