The motivation for having this type of Forth available follows from its characteristics. It is available as an assembler source, it is an indirect threaded Forth and it is documented. An assembler source has distinct advantages for getting started from nothing. Rebuilding requires the nasm assembler that is readily available. I did this work, because I needed it.
All configurations remain valid.
Only lina has been tested. The kernel contains all the CORE words, plus some words essential for a self contained system, and some words making it a practical system. And yes it contains blocks, don't laugh, see below. It is still based on a single assembler source, where each word is preceeded by a m4 macro. All configurations share a single master source file.