The assembly of the modules is similar to other projects of this type. The assembly diagram is marked on the PCB, so positioning the components should be easy.

If we build a system with a bootloader, we don't need U9 (EPROM) and U4 (HC138) on the CA80-CPU PCB. We don't have to solder points A, B, C, D, E and F too.

U31, U32 and U33 replace the mechanical keyboard, so we can not build it.