I need the exact command line to be able to duplicate what you are doing, and instructions on how to manage the machine, eg how do I enter the "Rainbow setup"? Are you talking about the MAME menu or a menu in the Rainbow graphical UI?
8N9600 is the same number of bits as 7O9600 so it would seem to work until you get parity error where the 7201 would do need to issue a Error reset command.
Last edited by Edstrom; 11/06/16 02:37 PM.