This is the first project where I use KiCad (version 7.0.2).

Schematic entry was quite smooth, but with the pcb layout I experienced some problems. It was difficult to arrange the components on a 0.1" grid. And since I do everything on a 0.1" or 0.05" grid, it is annoying that KiCad displays things like cursor position only in millimeters. [ Edit. You can set this to inches, see comments ].

Routing is not very difficult, but I miss certain functions. But it is possible that I do not yet know all commands for routing.

But don't get me wrong, I think the KiCad developers did a great job !

Here is the current state (you can click on the picture to get more detail) :

The lower part of the pcb is routed. For the rats nest I use several colors:

• red, VCC
• blue, GND
• light blue, databus
• green, address bus, micro-address bus, internal ALU signals
• magenta, microcode bus
• yellow, operand bus
• orange, result bus
• white, several control signals

This is far from finished, especially I/O components must still be added.