Sequential Circuits Model 800 Sequencer SN 800 - 772 with Original Foot Pedal

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via this auction

via the seller: "I am selling this as non-working unit.It powers up.I think the problem is with the internal clock not working.There is a guy on You Tube who talks about this problem [possibly here, here, or here]. You can manually step through the events.All switches seam to be working .I don't have an analog keyboard anymore,so I can't input any notes or play anything out.I've taken a few pictures showing different numbers and lights on the display.These units are very rare..There were only less than 500 made.Mine is SN 072 .I also have the start/stop foot switch.This unit is also made for the US market (110v).Unlike the other unit listed from Japan that needs a power converter.I was the only owner.It sat in my smoke free personal studio for years.Then it was packed away.I might even have a photo copy of the circuit diagram somewhere that I will include if I find it.There is some scratches and nicks.But for as old as it is ,it's in good shape.No broken switches.All LED's light up.

The 800 consists of 16 toggle switches which enable "cells". Each cell can hold up to 16 note-events each. The cells are loaded from CV (control voltage) keyboard via the CV/gate inputs (1 volt per octave) and can be programmed over a 5-octave range. The Gate is switchable between S-trigger and voltage gate. An internal clock runs from 20Hz up to 5kHz to calculate absolute note length or beat division if being driven externally by a low frequency clock. External input is provided via a specially wired plug. A multi-pin parallel connector is used to hook two or more 800's together. A foot-pedal was available for toggling between record and play modes and start/stop. The CV/gate output is quantized to semitones (1/12). The gate can also be switched between S-trigger and voltage gate."