Dear Paul ,

                 programming new Firmware Rev 9 and rev 11 , it doesn't work for my Polaris.

It is possible to have the Checksum ?

Must I recheck all the power supply Voltage before reinstalling the new Eprom ?

Should it be RAM Problem after " mamma mia "  30 Years ??

Best Regards .

Ciao

P.S. I use the M1 - UN DP48 programmer .As shown in the Photo Below .