Tonyp12 is working on a Risc-V cartridge for the Commodore C64 computer. The features are: CPU at 72 MHz with Dot Clock synchronization, 64 kB Flash and 20 kB RAM. 256 kB SPI MRAM (REU) and 16 MB SPI FLASH, USB host/device and a RTC that sets C64's TOD registers.