Oh nostalgia, the good ol’ LED dice… Really just to play with and not really useful…
The dice is completely discreed logic. As clock generator I used an astable multivibrator with two transistors. With diode-transistor-logic the LEDs are controlled and a button enables the whole thing.
Since the counter is running with 5V but we only had 9V on the bus, we just chained 5 diodes in series and the 3,5V drop left 5,5V for the logic to work.
And here the schematic
And a few pics