There are currently two boards available based on the Microchip ATSAME51 which provides support for the Controller Area Network (CAN) bus, a robust network designed for vehicle wiring systems, and it should be possible to add support for these to uLisp if anyone would find this useful.
Adafruit Feather M4 CAN Express
This is a Feather-format board based on the ATSAME51J19, a 120MHz Cortex M4 with floating point support, 512KB flash, and 192KB RAM. It includes hardware CAN bus support with a built-in transceiver, 5V booster, and terminal connection.
See: Adafruit Feather M4 CAN Express with ATSAME51
Documentation: Adafruit M4 CAN Express on learn.adafruit.com
Microchip EV76S68A Evaluation Board
This is a board in Microchip’s Curiosity Nano series based on an ATSAME51J20A. It doesn’t include a CAN Bus transceiver, so you’d have to add something like a TCAN1051HGV to connect it to a CAN Bus.
See: EV76S68A on Mouser.co.uk
Documentation: SAME51 Curiosity Nano User Guide