@WiFiLuke started a thread about the i2c config chips in optical LAN modules.
It reminded me that Matt at Blinkinlabs suggested a DDR4 and DDR5 parameter tables reader and writer. It’s a similar situation with an I2C eeprom containing id info.
One, not sure which, needs a 9 volt supply which we can do with the SMPS plank.
I bought a weird breakout/testing board that covers 5 flavors and sizes of DDR to play with.