[phendrenad2]

For a retrocomputing project, you can likely do analog as a separate board. And it's trivial to route power and ground lines by hand (excluding them from the autorouter with a rule). You don't even need power planes at the low speeds used by old computers! But, the hard part is optimally routing 100+ signal lines between chips. You can do it by hand, but it's just drudge work.