MEMORY
{
    A: start = 0, size = 8, file = %O, fill = yes, fillval = $33;
    B: start = 8, size = 8, file = %O, fill = yes, fillval = $44;
    C: start = 0, size = 8, file = %O, fill = yes, fillval = $55;
    D: start = 8, size = 8, file = %O, fill = no,  fillval = $66;
}
SEGMENTS
{
    A:  load = A, type = ro;
    B:  load = B, type = ro;
    C0: load = C, type = ro;
    C1: load = C, type = ro, start = 5;
    D:  load = D, type = ro;

    AO: load = A, type = overwrite, start = 4;
    BO: load = B, type = overwrite, start = 8+5;
    CO: load = C, type = overwrite, start = 2;
    DO: load = D, type = overwrite, start = 8+4;
}