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Troubleshooting
Serial Port Adapters
If you need to use a USB serial port adapter because your PC does not have a serial port, I can recommend two of them that I purchased from Amazon and personally tested. Full disclosure - the links below are affiliate links to the products - if I am gonna personally recommend them, why not get something for it if I can?
First is a DTECH adapter that uses an FTDI chipset. The second is a Gearmo adapter that also uses a FTDI chipset. One is being used with my desktop for development of 10LC with a 9010A unit on my desk, the other is used with my laptop for testing scripts on actual arcade hardware with a 9010A unit.
Both adapters work great set at 9600 baud, N81, with everything else in the driver set to the defaults.
Gearmo USB to Serial Adapter RS232 with LED Indicators Windows 10, 8, 7, Vista, XP, 2000 Support