Hi all,

I am trying to understand computer architecture. In particular: - Physical view i.e. what all is packed inside the motherboard and what all outside - Conceptual view. how processor,memory,peripherals are connected.

I am getting confused among various buses like local bus,PCI bus, SCSI bus,ISA bus,USB bus. I am looking for block diagrams. How is the USB port connected to processor ultimately? through PCI bus etc? Why do we have so many buses? What was it like before SCSI/IDE came?

Does the diagram at :

http://www.vaughns-1-pagers.com/computer/pc-block-diagram.htm

look correct? It shows no connection between PCI bus and SCSI bus. Is that correct?

I would greatly appreciate any other link especially of block diagrams/anatomy and not just textual writeup.

Thanks,