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While going trough some papers recently, I`ve found a very early sketch of the motherboard design I made back in Febuary. There are all the basic components on the sketch that are now on the final version of the board. The purpose of the sketch was to determine the optimal position of all components to be placed on the PCB along with all the buses , power and other signal traces. Especially the RAM/ROM and I/O decoder solution suggested here proved to be useful, so now I`m using it it the final version.