ShowConfig shows the basic board config information for troubleshooting efforts. The ever-changing and expanding board and CPU detail is outsourced to 3rd parties like MMULib and BoardsLib.
You can get ShowConfig to display them, if you include the publicly available boards.library in your Libs drawer. And speaking about MMU, we did the same as we can detect it with the aid of mmu.library which is also publicly available. Both libraries can be downloaded from http://aminet.net/util/libs/MMULib.lha and http://aminet.net/util/libs/BoardsLib.lha.