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8-bit I/O interface for Atari ST

8-bit I/O interface for Atari ST
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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