I'm a 70yr old beginner and picked up what was described as a Casio CDP-s90 in the advert, but is badged S100. I understand it was bought 3-4 yrs ago.
But when I download the manual, the sockets on mine are not on the left as described, but on the rear, and the top of keyboard controls are different.
Anyone idea on if there were two models or an adapted distributer version?