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Sequential
Sequential was founded in 1974 by Dave Smith.
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Curtis Electromusic Specialties

CEM3379 - Voltage Controlled Signal Processor

Ensoniq ESQ1, SQ-80, Sequential Circuits Prophet 2000, Prophet VS, Doepfer A107, A122, A106-6 and A109

Pratt-Reed bushings

Used in Sequential Circuits Prophet 5, Oberheim OB-Xa, PPG, most ARPs, Moog Minimoog, Vox and Farfisa Organs, etc.
Curtis Electromusic Specialties

CEM3394 - µP Controllable Synthesizer Voice

Sequential Circuits Six-Trak, Multi-Trak, Max, Split8, Akai AX60, AX73, VX90, Doepfer A111-2, Dark Energy (original model), Simmons Drums SDS9/SDS1000/SDS800

Drumtraks OS 0.5

Including a copy of the document MIDIGUIDE

Drumtraks 7 segment double display

Also available in blue.

Drumtraks potentiometers

MB8416-20

Sequential Circuits Drumtraks

Drumtraks EPROM sounds

Drumtraks lithium battery

Zilog Z80 CPU

You should also check my Z80 CPU tester
used in Sequential Drumtraks, Prophet 5, Prophet 10, Prophet 600, Moog Memorymoog, Roland Jupiter 8, Oberheim OB-8, E-mu Emulator I and II, SP-12, SP-1200, Drumulator, Linn LM-1, Linndrum and so many more...

DAC71-CSB-I D/A converter

used in Sequential Prophet 5, 10, 600, T8

MC68701L - Microcomputer with EPROM

Used in Sequential Circuits Prophet 2000
This is the keyboard controller of the Prophet 2000 and I had a hard time getting this one. There is a 2048 bytes EPROM on chip. None of my huge collection of programmers could deal with this without adapters impossible to find. I bought a Prophet 2000 without a lot of chips and this was the last one to install. But I am now a proud owner of a perfectly working Prophet 2000.

Sequential Circuits Prophet 2000 2002 RAM expansion

RAM expansion module designed to Sequential Circuits Prophet 2000 and Prophet 2002 samplers. This is a replica of the original SCI PC877 and it doubles the original memory from 256Kb to 512Kb. It doesn't seem much these days, but it makes a huge difference. Finding a original module is very hard and the prices are becoming absurd. I really wanted to have one, so I just made it and you can also have one because I made some extra PCBs.

The KIT includes 3 PCB spacers and screws.

It needs the firmware version 3.0 or newer in order to work properly. I can provide you the last firmware (4.3b, check my other items). If you buy both products together, I will give you a small discount.