This is a small Arduino sketch that converts MIDI (serial) data to EDP Link (parallel) data.
"EDP Link" was a pre-MIDI messages format developed by electronic musical instrument developer Electronic Dream Plant for communicating note-pitch and note-on/off information between their products (Wasp, Gnat, Spider etc).
I wrote this sketch to control my Wasp clone (Jasper) via MIDI, so I can't guarantee this solution will work with genuine EDP devices.