>"The transistor gates are the green lines. Line A (polysilicon) is colored both pink and green; it's green where it is a gate and pink where it's just a wire."

>"The transistor gates are the green lines. Line A (polysilicon) is colored both pink and green; it's green where it is a gate and pink where it's just a wire." Thanks so much for this explanation. The input and output lines in schematic diagrams have always vexed me. The disconnect between how a transistor is often represented as a standalone 3D graphic such as you have above and how its actually implemented is silicon being the source of my confusion. Have you considered turning these z80 blog posts into a book? You have a great way of explaining things. Cheers.