Amazon.com: myVolts Ripcord USB to 7.5V DC Power Cable Compatible with The Casio SK-5 Sampler : Electronics
Casio SK-1 Circuitbent Sampling Keyboard - Serviced FOR SALE - Soundgas
Roland XP-50 XP 60 - JW-50 JX-1 JX-305 SK-501V Replacement KEY | eBay
Casio SK-1: Overhaul, Part One | Electronic Musing
Not as cool as some of the other thrift store finds, but I still feel I got lucky. Just gotta figure out how I want to fix the missing key…. : r/synthesizers