Life before the SID...

HOW CAN I HEAR SOUND ON MY PET?
Like many other microcomputers of the time the PET was not originally designed
to produce sound. A few methods of sound generation have been developed but
the most popular employs the use of parallel user port pin M which is used
to generate a 'square wave' output by setting the 'handshake register' for
port B into a free-running mode. Adjustments to the timing of the handshake
and the pattern of the 'wave' adjusts its sound and timbre. You can achieve
approximately 3 octaves of notes and various noises with this one voice
output.
The latest 4000/8000 (large screen PET) motherboards have a built-in piezo
speaker and also have a bell sound accessible with a print: chr$(7)
You can get most of the parts (except the parallel port connector) at
Radio Shack, including a low-cost mini amplifier.
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