The Atari ST series computers have their strong and weak points.
For instance, these machines have a powerful graphics interface,
but lack a parallel I/O port. The latter deficiency is a spot of bother
when it comes to connecting certain non-Atari peripherals and, of
course, horne-made extensions. The circuit presented here solves
this problem elegantly by means of ... music! A handful of standard,
inexpensive components and a small control program written in
BASIC, C or assembler language turn the MIDI channel of the Atari
ST into an 8-bit 1/0 port that achieves a maximum data rate of
1 kBitis. No modifications are required in the computer.
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