I used uLisp in a project. I had no available non-volatile storage so I handled persistence by writing my code on the laptop and sending it serially to the micr

I used uLisp in a project. I had no available non-volatile storage so I handled persistence by writing my code on the laptop and sending it serially to the micro. When some functions proved to be stable and useful I ported them in as uLisp builtins with a C implementation. I used it as a debug driver in an STM32 for an eZ80 CPU - the STM32 provided USB to TTY and a third serial channel for debug control. It was a nice addition but I do wish it was designed in a way that made these modifications easier.