Given the chip, you can't get to the "software only" part until you have: - The chip mounted on a board with at least memory and communication. - Software on

Given the chip, you can't get to the "software only" part until you have: - The chip mounted on a board with at least memory and communication. - Software on your machine to talk to the board and hear back from it. In general, the most rudimentary development kit possible is to have the chip on a board with a ROM socket, and some development setup that allows you to burn code to a ROM. Then you plug the ROM in the board, turn the power on, and see if it works ...