Arithmetic circuits alone do not make a computer. A computer needs memory¹, places to store and retrieve information, if it is to have data² that can be operated on. And, memory must itself be describable in terms of our logical primitives³. The exercises below demonstrates how a small piece of memory might be built in Logg-O.

1. Figure 7.16 in your text shows a latch⁴ circuit. Use Logg-O to build your own latch circuit. Test it out to see that it performs as described in text. Then, save your circuit as file "latch.dat".
   
   
2. Figure 7.18 shows how a latch (the "black box" just left to the center of the diagram) can be connected to other Logg-O built-ins to produce a one-bit memory cell. Extend your latch circuit to implement this memory.
   
   
3. Once you are convinced that your memory circuit performs as it should, save it in a file named "memory.dat".