Oleg Zabluda's blog
Tuesday, April 24, 2012
 
As I was reading
As I was reading
http://www.linuxuser.co.uk/features/raspberry-pi-interview-eban-upton-reveals-all/

I was floored by the following excerpt:

"""

PCB routing has been a real issue. It’s not just size, it’s also simplicity: the board is a very simple board, in terms of the number of layers and the kind of features that we use in the PCB design, because features cost money. So, it’s easy to make something which is big and simple, and it’s easier to make something which is small and complicated, but it’s hard to make something which is both small and simple. So, yeah, a lot of effort went in to that, and it is one of the reasons we took so long doing it.

The alpha boards took about three days to lay out, but you can see [...] they were big and they were eight layers, whereas the final board is small and six layers. That stuff translates directly into routing effort.
""""

So nowadays 6 layers are considered simple and cheap. After brief search online, I found that they make 26-layer PCBs now. Amazing.
https://www.google.com/search?q=26+Multilayer+PCB
http://www.linuxuser.co.uk/features/raspberry-pi-interview-eban-upton-reveals-all/

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