Release 0.21.0 adds RP2040, specifically Raspberry Pi Pico (even though other boards using the RP2040 with Winbond Quad SPI flash chips should also work), support to zeptoforth. It comes with UF2 files and has the ability to generate UF2 files just from executing make, so one will not need to use SWD (which for the Raspberry Pi Pico in practice means soldering extra pins) to load zeptoforth onto RP2040-using boards. It also has the ability the automatically erase old compiled Forth code upon loading a UF2 file, so one will not need the likes of OpenOCD to erase existing data on the board. (Note that it only erases up until the 1 MB mark to enable future functionality which may enable storing data in flash above this mark.)