Sound and Delay routines for Fitted Software Tools Modula-2 compiler.
The Delay, Sound, and NoSound procedures are functionally
identical to their Turbo Pascal namesakes.
These routines directly address the Intel 8253 Programmable
Interval Timer (PIT) chip. Therefore these routines should run
faithfully on all PC-compatible systems, regardless of the CPU
or clock speed. I wrote these procedures using a a 12MHz 0ws
'286, and tested them on an 8MHz 8088.
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