Partial 12-bit support. VM mostly works (GC is left) but compiler does not.
tree05b7fd93f32af77bc9eb8b377e7a11dd5c8d2522
-rw-r--r-- 12516 library.scm
-rw-r--r-- 58203 picobit-vm.c
-rw-r--r-- 104689 picobit.scm
-rw-r--r-- 388 red-green.scm
-rw-r--r-- 31529 robot.scm