My Ensoniq SQ-80 synthesizer has an internal 800 Kb 3.5-inch floppy drive. I feed it 1.4 mB floppies - most work fine with the funky formatting.
It sports a 25,000-note, 8-track sequencer with good editing abilities.
40 internal sound patches - all fully editable. Optional external cartridge holds 80 more, although mine holds 640 :-)
75 glorious 8-bit waveforms. Mine has 180 additional "hidden" waveforms - totally glitchtastic!
8-voice polyphony (3-waveforms per voice).
Each voice has 3 LFOs, 4 ADSRs, 1 lo-pass filter and RESONANCE. All of these except one ADSR are assignable.
Yep..it's got MIDI in, out, and thru.
Lots of dedicated function buttons + a 2-line, 80 character alphanumeric fluorescent display = easiest synthesizer interface on the planet.
OS ROM is 128 Kb.
Waveform ROM is 128 Kb.
System RAM is 64 Kb.
Sequencer RAM is 64 Kb (UART bankswitched with System RAM).
Motorola MC6809E processor running at 8 MHz.
My 'board was built in 1988. Oldschool rules.