The State Machine

A project log for LLTP - Light Logic Transistorless Processor

My attempt to create a CPU/MCU without transistors or relays

Dr. CockroachDr. Cockroach 09/02/2020 at 15:160 Comments

September 4, 2020 -  The transistorless State Machine is coming along and is going through the debug stage. It has a few glitches but generally is performing the way I want it to. The short video clip shows the cycling action taking place between the sequencer, flip-flop and the main logic.

September 2, 2020 - This construction is the large part of the State Machine. This logic board along with the previous Flip Flop performs the switching that almost doubles the Sequencer outputs. This odd design will all become a bit more clear once it is up and running.

At this point all the Light Logic opto-coupler cells have been coated in black nail polish except for the bases. That leaves a nice glow when the gates are active once the logic wiring is finished.

330 Ohm resistors are installed and 3 volts applied to the power buss. Rechecked that the CdS cell minimum resistances were still in the usable range between 200 and 450 ohms.

The front of the board showing the uncolored Light Logic opto-couplers in place.

And the view of the rear side showing the power and ground wiring. This side will be hidden, thankfully.