Old PSX Pedals with COM Port on PC?

I've got an ancient MadCatz Steering wheel/pedal combo for the PSX. The Pedals plug into the steering wheel via a COM port. The steering wheel then plugged into the playstation controller port, so no dice with the wheel for any reason. However, it occured to me that if I could wangle getting the pedals to work, then I'd have some, effectively free, rudder pedals, although obviously not of CH quality. I'm curious if anyone knows how I can hack these around to get them to work through a COM port on my computer.