What is the role of EEPROM? The trident have it?
The EEPROM is part of the ATmega 2560 processor. It’s role in the 2x series is 4KB of non volatile memory for the processor on the control board. As far as I know the trident will use a RPi 3 but I’m not sure how it will interface to the rest of the hardware.
If the trident uses a similar design utilizing a secondary 8 bit processor it will most likely have an EEPROM, if the RPi3 directly interfaces with the rest of the hardware directly through GPIO the EEPROM will likely be replaced with the Broadcom BCM2837 DMA or MMU’s.