Casio CZ-101

49-key phase-distortion digital synthesizer with MIDI In/Out, line output, headphone output, DC9V power input, and optional RAM cartridge storage.

Casio Rapman RAP-1 compact rap keyboard with built-in speaker, microphone input for the voice effector, mono output jack, and external power jack. Similar SK-style Casio rhythm boxes sometimes add line input and sampling.

1986 Casio drum machine and sampler with 12 PCM drum sounds, four user sample pads, stereo mix outs, 10 individual outs, a headphone jack, MIDI In/Out/Thru, a mic/line sample input, a foot switch jack, and an MT tape backup port.

Virus TI series hardware synthesizer with Total Integration, stereo analog input, 6 balanced analog outputs, S/PDIF I/O, USB audio/MIDI, and a dedicated headphone output.

Classic semi-modular analog subtractive synthesizer with three VCOs, dual envelope generators, preamp/envelope follower, ring modulator, sample-and-hold, spring reverb, built-in speakers, and Tini-Jax patch sockets.

Analog matrix synthesizer with stereo main outputs, insert send/return, external audio input, front-panel headphones output, 12 CV inputs and 12 CV outputs, gate and sync I/O, MIDI DIN and USB-B connectivity, and pedal inputs.