Not a big deal though, I don't think anybody will care. (No, I don't know where exactly it is located in the dump)
Thanks for the dumps for both of you. FWIW, 100a and 100b won't need separate ports, they are almost completely identical.
If possible, please use the official dumper script - the CHDK tools expect dumps starting at 0xff810000 for cams with 8MB ROM.