If you looked at very early computers that used tubes, they often had a rudimentary backplane. Later these advanced to such as the VMEBUS http://duckduckgo.com/?q=vmebus+backplane and for the personal computers the S-100 was very common.
With the Apple 1 you see the beginnings of the motherboard where the computer was small enough to be put directly on the backplane.
Firstly, I apologize if this is the wrong place. My question is what is the equivalent of Motherboard in the older generation computers (like the 1st Gen computers) ???
I heard it was vacuum tubes. If so, I would like to know how they performed the function of a motherboard.
Thanks in advance.