B4 Tutorials 8-10: We are building a 4-bit computer.

In this tutorial, we are building a simple 4-bit computer capable of addition, subtraction, data retrieval and data storage. We learn how to arrange the boards and connect them with power, data and control wires.

We program the B4 by entering data into the Data RAM and control instructions (the program code) into the Program RAM. For both, we use the Manual Programmer.

Step by step, we then walk through the code and observe how it operates inside the machine.