Step 2 : Stealing your power
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You need to have a common ground for the chips, as well as a good 5 volt supply for all the 374's, What a better way than to get it from the desktop tower. Here you see the female parallel port plug, and a modified 3 prong plug. I cut the "HOT" leg off just in case anybody accidentally plugged it into 120 volts, nothing would happen(neutral and ground carry no voltage, and are electrically the same.) My 5 volt positive comes on the neutral blade while the negative is on the ground pin.
Note the labels.
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