Nothing public yet, it's an odd case, there is no contact with the author, but he apparently expressed to someone that he doesn't want the ROM shared. It all borders on the "five monkeys experiment" by now.
There is a community and a very devoted one, yes, but it's a very small and dispersed one as well, a lot happens over email. There is a group of collectors who mostly hoard the devices and ROM cards and keep them under glass and like these things to keep value, and then there's the more engineering types like me, who actively tinker and actually use the things.
This is all on a pocket 8-bit - calling the platform a "programmable calculator" is downright offensive! ;)
I wrote an (unfinished as of yet) IP stack for it in DL-Pascal, I have working UDP and a DNS resolver but no TCP yet: https://github.com/wowczarek/pbnet
