Measure Frequency for Apple II Computers

Frequency Meter

This program turns the IBM or Apple II into a general-purpose frequency meter covering much of the audio frequency range (20 to 10,000 Hz). There is also a Sound Utilities mode that is designed to help demonstrate the physics of music. For example, the program can be used to show the ratios of the frequencies of a musical scale. A relatively pure tone is required. Human whistles, tuning forks, fifes, and electronic keyboards all work well. A fife is included with the program. A Vernier Microphone is needed to deliver the sound to the game port. Alternatively, a tape recorder and microphone may be used to feed sound to the cassette input port on the Apple II+ or IIe.

ORDERING INFORMATION:

Frequency Meter Software (Order Code FM-A, $39.95)
9-pin Microphone for Apple IIe or IIGS (Order Code MCA-9, $30.00)
9-pin Microphone for Apple IIc (Order Code MCA-C, $30.00)
16-pin Microphone for Apple II+ (Order Code MCA-16, $30.00)