What are the system requirements for EVE?

As long as MCU has QSPI (FT81X only), SPI or I2C interface and has the capability to construct display list commands, it can work with EVE. This means that a low end 8 bit microcontroller can be readily used with EVE or that because the bandwidth requirements are minimal that the current MCU can be used and the display capability readily added into the architecture/system.