One of the more famous of these devices is the , a cascadable 4-bit arithmetic logic unit, or ALU. An ALU is the heart of a microprocessor. Registers, instruction decoders, counters, and an arithmetic/logic unit, or ALU. And for decades the , as an all-in-one 4-bit ALU on a chip. This applet demonstrates the TTL-series 4-bit arithmetic-logical unit. It takes 4-bit operands and a carry input and...