I walked another person through this process this week so figured I'd put some of this knowledge down here..   You need:   TI-99/4a with either a RS232 card (TI and Corcomp have been tested, someone needs to test a myarc card) OR a nanopeb. CFHDXS1 software on the tI OR a XB27 suite cartridge which has that software included as option U.. You can order both of these on arcadeshopper.com for a reasonable fee.   A rs232 cable (for the TI RS232 card) or a null modem cable (for the nanopeb)