No sure about other brands/models but the Yamaha cx5 was intended as a music workstation from the beginning and did have midi in & out. Those were the days just

No sure about other brands/models but the Yamaha cx5 was intended as a music workstation from the beginning and did have midi in & out. Those were the days just after Yamaha almost monopolized the music industry with the sound of the DX7 and following synthesizers.