video upload by HighPotNoose
"A demo of all the instrument presets on the Yamaha PSR-90, a portable music keyboard from the late '80s. Hope you enjoy it. Audio captured with a Tascam DP-008EX."
via this auction
I usually skip preset based home keyboards but I thought the UI design of this one was interesting. The square button sections feature buttons for Bright/Mellow and Slow/Fast. It also appears to feature a programmable sequencer section on the right with support for RAM cards and Tape.
