Data transfer via 1 wire.
LH side is TX & RH side is RX. The single connection between the two sides is the SPST switch at bottom of the screen.
Set the bits for the TX to display a number. That number will then be displayed on the RX side.
The sequencers on each side are synchronised via a shared clock pulse / signal pulse wire. The signal pulse is higher voltage. The TX sequencer reads the bits set for the TX display (4 clock pulses), and sequentially transmits them to the RX as higher voltage pulses. On th RX side, all pulses are fed to the sequencer, to make it step, but only the higher voltage pulses get past the zenner diode. These pulses are then combined with the output of the sequencer, and sent to the 4 latches, (top right) (used counters to create the latches). This creates a latched bit set. A fifth pulse then loads this bit set into the counter that feeds the RX display.
Does not work at higher sim speeds.
