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(Also read descriptions for 1.0 and 2.0) Then we got some chips and started building the CPU, using 7400 series TTL logic chips. Naturally this took a lot of power (5 volts at 25 amps) and each PCB was wired by hand, to create the data path (16 bits) and the microsequencer (using a diode array to implement the microcode ROM). The instruction set went through many changes during the 1980s and 1990s.