Desperately Seeking Apple PowerBook Adapter M7783

Well, a friend has presented me with an older Apple Macintosh PowerBook Duo 230 for me to check out and see if it will work at all for email and basic internet should my PowerBook G4 die. The Apple model number is M7783 and it's 24v. This is for a 1992 Apple Macintosh notebook. I'm attaching a photo to help you identify it if you think you might have one. I'd appreciate any help tracking one down you might be able to provide!