I'll take the predicates "low cost" and "programmable" literally.

As far as the programmability is concerned, the application code will be in Forth. There is no particular reason for the choice of Forth, other than it's ease to create a Domain Specific Language with Forth, it's interactive, powerful, very compact, easy to hack, and fun to use.

Some of the code is already working, and it's time to detach it from the upstream project eForth for cheap STM8S Value Line gadgets.

The board support code for will remain a part of the upstream project, and this project will contribute to it. This little project promises to be fun!