Thank you man, in the meantime I oriented my searches to MIDI-to-RS232 adapters/converters. I found some schematics but there is an interesting link..I hope that with this new info I can be more clear. Please take a look http://www.edrum.info/files/edrum16_v1_5.gif Edrum is a diy project, they use the PIC16F877 controller and it's connected to MIDI and MAX232/RS232 Out. Commodore 64 has a RS232 port IN... Now, I'm not a genius so it's possible that I'm mistaking but what happens if I include MAX232/RS232 in my next Midibox project? Ex. PIC16F877 --- (25) RC6/TX/CH ---> T1IN PIC16F877 --- (26) RC7/RX/DT ---> R1OUT In this way can I send MIDI messages from Midibox to C64 using RS232 port? Hope it's clear Thanks, Scube