Just Desserts : sorry! I didn't realize the already point me to the right anwser frown I thought you were talking about using socket or not.

pmackinlay, Vas Crabb : I found the bitbanger solution while Googling, on TI82 related page but for some reason I didn't find it on command line... I thought it was since replaced by comm_localhost/comm_remotehost

so what the difference / benetifs of bitbanger vs comm_localhost/comm_remotehost ?
At this time, I successfully send data (TX), I have to fix some part of my receive code (RX) but should I move to bitbanger first ?

I'll try using device_slot after that, based on TI82 or NES example