Lisp MCU

http://www.mail-archive.com/picolisp@software-lab.de/msg04823.html

PilMCU is an implementation of 64-bit PicoLisp directly in hardware. A truly minimalistic system. PicoLisp is both the machine language and the operating system:
* Memory management is trivial, just the Lisp heap and the stack
* The built-in database is extended to hold a "file system"
* One SSD per database file for mass storage
* "Processes" run as tasks and coroutines
* Events (timing and interrupts) via a 'wait' instruction
* Complex I/O protocols are delegated to peripheral chips

>>6
I've not tried Pico Lisp specifically. I assume that it is Lisp and the Lisp syntax and semantics are very simple to learn.