Vacuum Tube Computer Part 25: Upgrading the Blinking Lights

The processor of the vacuum tube computer uses vacuum fluorescent displays (VFDs) to show the internal state of the machine. The method used to drive them was sensitive to the fan-out of the signal displayed, resulting in displays having different intensities with some difficult to see with the room lights on. An overhaul using a different VFD and driver circuit makes the displays uniformly visible.