For the Tell Time Contest, most digital clock submissions will be clocks driven by a microcontroller. This clock, however, uses a homebrew CPU from TTL chips to run the clock. The square-inch CPU only needs external ROM, RAM (the two big chips) and a few glue chips to drive the displays. Time reference is a 32.768 kHz crystal that is divided down to 2 Hz with a HC4060.
Since the most important aspect of this clock is to show the 1x1 inch processor, no enclosure was made (yet).
There is an online web-based simulator of this clock, here: Clock simulator. Just open that webpage and then press RUN. You can even modify the program and run or single-step it. (But the simulation is 'free running' so the clock will be too slow or too fast).