Hi. I have a LMG7550XUFC display, can i use it with Leonardo?
I have also this board. it has tx rx gnd on board and controller is M6255 from OKI.
Display is HITACHI. Please help me.
Thank you.


A vintage bit of hardware out of something. My guess is a terminal of some sort. The program is stored in the EEPROM (or EPROM) in the socket. Very many electronic PCBs will have Tx, Rx and Gnd, using several different protocols. Nice to add to a collection of old useless brds, but probably not a lot else.