This port is for the Homebrew-Computer MyCPU. The MyCPU is a "Central Processing Unit" (CPU) that is completely built with discrete logic gates. Over the years the project has grown, and now the MyCPU is the heart of a real Personal Computer. Since 2006 is a C-Compiler available, thus it is possible to compile ANSI-C sources like pico]OS for the MyCPU.
Because of the limited program space this port does not support the nano layer on the MyCPU.
This port is compileable with a modified version of the CC65 compiler from Ullrich von Bassewitz. You can download the special compiler from the MyCPU homepage.