linuxpimp20

hi im posting here because i don't know if it really belongs in any of the other catergories. i've become interested in modding and taken things apart and examining them lately. i assume modding id be taking hardware from here and there so i want to learn more about programming hardware that are computers but not necessary pcs. what skills would i need for this besides soldering? do i need to learn assembly? ill give you an example. i was taking apart an old digital alarm clock and was curious what happens after you press the buttons and they hit the hotspots on the circut board. is there any books on the subject that people would recommend? thanks for any replies in advance.