digraph TopLevel {
    compound = true
    bgcolor = lightcyan1
    fontname = Arial
    fontsize = 8
    label = "TopLevel"
    node [
        fontname = Arial,
        fontsize = 8,
        color = black
    ]

    C64 [
        fontcolor = black,
        URL = "classes/C64.html",
        shape = ellipse,
        color = palegoldenrod,
        style = filled,
        label = "C64"
    ]

    HostSystem [
        URL = "classes/HostSystem.html",
        label = "HostSystem"
    ]

    HostSystem -> C64 [

    ]

}