It’s an AD12 1.5a with ground core and an L shaped power tip. There are a lot of near matches on Amazon and eBay. But genuine Casio adapters cost $41-$46. That’s a lot of money for a near match that may or may not work. Interestingly I tried a 9 v adapter from Casio, and it came on.
Looks like a standard 12v, 2A centre negative power supply. Loads on eBay for $15
Hi, I recently bought a Korg M1 Keyboard on Reverb.com. Of course it had no power adapter cord. I didn’t want to wait for the seller that forgot to pack it to send it. He lived in Canada, I live in the U.S. I did a lot of homework to ensure I was buying the correct one on Amazon.com I got it and it works perfectly. My advice to you is simple, do as much research as you can to ensure you are buying the correct wattage, voltage, amperage and shape as you mentioned. For example: If the cable you need is a 110 and the one you find closest in all specs is a 120 that’s fine. A little more capacity is better than less. Less capacity will do damage. Hope this helps and best of luck.
P.S. some may look exactly the same as another but they may be different as for as AC/DC type, positive and negative DC/AC etc…. Don’t ever go by looks… go by specs or you could ruin it’s mother board components and power supply, also cause a fire. Get it’s exact specs for your machine and the correct plug, even if it costs more. It’s better to spend a little more, know exactly what you’re getting instead of ruining your entire machine and having to deal with then buying an entirely new machine that will cost you 100 times more money. That makes no sense. Be smart… do the research so you know exactly which kind you need and exactly which kind someone is selling you meets all specifications