Clicking on http://cpuville.com/cpu_design.pdf gives me:

    Forbidden
    Remote Host: [<redacted>]

    You do not have permission to access this
    page or file

    Data files must be stored on the same site
    they are linked from.

To see the PDF you need to visit the main page and then click through. Fortunately, if you first try the forbidden page, the link you want will already be purple for you.