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Homemade electronics Stuff old and new
ISA card, Parallel, Serial, Midi, DTMF

The main ISA address IO decoding and data latch, was done using a standard card that I have also developed for I.T.E.
The Parallel In/out port is done using a 8255
Serial and Midi is done at add-on board with 16C550 max232 optocoubler and 4Mhz osc
The two DTMF Decoders MV8870 is ripped for another project of mine.
This is the prototype, done in 1996