THE First MIDI Operating System Prophet 600 Six-0-1 OS ROM * SOLD
The Prophet 600 is the World's First MIDI synthesizer
25 Prophet 600s shipped UPS on December 27, 1982
At that time no other MIDI synths existed so these 25
Prophet 600s could ONLY connect via MIDI to another Prophet 600.
In December of 1982 Sequential Circuits shipped 25 Prophet 600 keyboards with OS Six-0-1 These Prophet 600s became the world's first commercially available MIDI synthesizers.
Vintage Sequential Circuits SIXTRAK Promotional Stickers * Ten (10) for $10
Ten (10) Vintage SIXRAK Promotional Stickers with pressure sensitive adhesive backing
Original Prophet-T8 Wooden Key * $8 Souvenir * Memento * Pieces of T8
White Key from Original Sequential Circuits Prophet-T8 keyboard
White Key from Original Sequential Circuits Prophet-T8 keyboard * Side View
Original T8 Black Wooden Key * $8
Black Key from Original Sequential Circuits Prophet-T8 keyboard
Original Sequential Circuits Brochures Prophet VS*Prophet 2002*Prophet 3000 Three (3) Brochures for $12
Three (3) Original Sequential Circuits Brochures: Prophet 2002 * Prophet VS * Prophet 3000
**** Original MIDI Chart MIDI-5 **** for 10 Sequential Circuits instruments Vintage 1985 ** $6
Original Sequential Circuits MIDI Control Summary Chart MIDI-5 covering 10 SCI instruments Drumtraks * Prophet 600 * Prophet-5 * Prophet-T8 * Prophet 2000 * MAX * Split-8 * Sixtrak TOM * Multitrak ** 2 sides ** Rigid Cardstock Paper Folds Out to 11 inches by 17" inches
Original MODEL 64 Op Manual * $7
Original Operations Manual CM64A for the C-64 Sequencer & Commodore 64 computer January 1984 * Collector Quality Condition
Sequential Circuits Service Department Original Field Bulletins
Two (2) original Sequential Circuits Inc. Publications * Field Bulletins #8 August 1982 and Publications Index TN10 August 1985 ** Collector Quality Condition
Four (4) original Sequential Circuits Inc. Publications * Field Bulletin#7 May 1982 * Field Bulletin #12 July 1984 * Field Bulletin #13 April 1983 * Field Bulletin #14 July 1985 Individually Stored in Clear Plastic Bags for decades in Collector Quality Condition
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Two (2) Model 700 Cables for $19
NOS Sequential Circuits Model 700 Cable * Cinch-Jones Socket to 1/4 inch plug
NOS Sequential Circuits Model 700 * 7-pin Viking cable
Sequential Circuits/SEIL Manuals Operational & Tech * Four (4) for $15
In 1983 Dave Smith visited SEIL in Italy & agreed to place the SEQUENTIAL CIRCUITS brand
on 3 SEIL keyboards in an unsuccessful attempt to increase SCI's sales & profits.
The SEIL Orchestra II became the Sequential Circuits Prelude
The SEIL Cruise became the Sequential Circuits Fugue
The SEIL PX became the Sequential Circuits Piano Forte
PRELUDE Operations * PIANO FORTE Operations * PIANO FORTE Technical * FUGUE Technical
************ FOR SALE *********** SEQUENTIAL CIRCUITS Domains SequentialCircuits.net SequentialCircuits.org SequentialCircuits.info SequentialCircuits.us SequentialCircuits.com
Last Update: Sept. 4, 2026
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