The MCU variant on the motherboard https://i.imgur.com/ehNHPeY.jpg https://i.imgur.com/ehNHPeY.jpg is one-time programmable, as opposed to an EPROM. Because of

The MCU variant on the motherboard https://i.imgur.com/ehNHPeY.jpg https://i.imgur.com/ehNHPeY.jpg is one-time programmable, as opposed to an EPROM. Because of this, I wouldn't worry about it losing its data, as OTP ROMs use blown fuses to store 1/0 state. It's true that it could just be an EPROM without a window, but the datasheet mentions two different programmers, one for the EPROM variant and one for the OTP variant so I doubt this is the case. More information: https://pdf1.alldatasheet.com/datasheet-pdf/view/7077/NEC/UPD75P308GF-3B9.html https://pdf1.alldatasheet.com/datasheet-pdf/view/7077/NEC/UP...