I stopped in for a book sale at the local public library and found a Powerbook 180c. I bought it for two dollars. The battery does not hold any charge but if I plug it into the charger it runs. When I turn it on though I only get a picture calling for a floppy drive. I assume this is because the hard drive has no OS on it and I need to install an OS from a floppy disk. So my question is what OS does this machine run and where could I obtain it?