Commodore Plus 4 - Page 214

register value 7) use the 7 as the second number after the SOUND
command—SOUND 1,7.30.
Use the following formula to find the sound register values for frequen
cies other than those in the table:
SOUND REGISTER VALUE - 1024—(111860.781/FREQUENCY)
Both the table of sound register values and the above formula are for
NTSC televisions. This is the television standard used throughout the
United States and all of Canada. If you are in a country where PAL is
the television standard, you should use the following formula to calcu
late new sound register values for the entire table:
SOUND REGISTER VALUE - 1024—(111840.45/FREQUENCY)
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