This classic early 1990's keyboard was a great success for Korg. Many thousands were made, and there are still several in good order ones, like this one about. Very typical and distinctive strong sound of it's own.
I bought this from a music shop in Bristol second hand some seven or eight years ago. The floppy disk drive was not working, and still doesn't, but you can get USB disk drive emulators that are easy to fit and cheap. This means you can store a load more data than the floppy ever could, and save to a USB stick.
The other common fault is the back light has a mind of it's own - the easy answer is use the Soundtower editing software I can give you - it make it really easy and fun to play with the sounds.
A good tidy example that works in every other respect. No dings or scratches to mention past normal wear and tear.