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M50734SP CPU

used in Kawai R100, R50, R50e, Cheetah MD16

MAT04FY

Used in Moog MiniMoog Voyager

MB81464-10 or M5M4464AL-12 (ZIP Socket) 65536-WORD by 4 -BIT Dynamic RAM

Korg 01/W family DRAM. There are 5 units of these chip in these synthesizers. Early units used M5M4464AL-12, later units used MB81464-10

MB8416-20

Sequential Circuits Drumtraks

MC68B50 - Asynchronous Communications Interface Adapter

Solton TS4K, TS3K

MM5437 - Digital noise source

Roland JX-8P, MKS-70, Siel DK 70, DK 80

MM5837 - Digital noise source

Used in Jen SX-1000, Crumar Spirit, Moog Memorymoog, The Rogue, Micromoog

P8031 Intel CPU

Used in Kawai SX-210, SX-240, Roland Jupiter 6, JX-8P, JX-10, JX-3P, MKS-70, MKS-80, Crumar Bit One, Bit 01, Bit 99

PC910 or TLP552 Korg M1 MIDI optocoupler

Your Korg M1 isn't receiving midi? Most likely, this is the problem.

PCM1716E - DAC

Oberheim OB12, Korg BX-3, CX-3 year 2000 version

PCM55HP - DAC

A typical problem in early Korg 01/Ws, the sound would become noisy specially when using effects.
Korg 01/W series and family (03RW), Kawai K5, K5m

R1121-11 Rockwell Display/keypad processor

This chip is problematic. Usual symptoms are keypad keys not working and/or display shows garbage.

Used in: Ensoniq ESQ-1, SQ80

R6502P Rockwell 8 bit processor

used in Elka Synthex

S10430 - Keyer/Divider from AMI

Used in Korg Delta DL-50, Lambda ES-50, Elka Elkatwin 61 and many others.

SAD4096 - Reticon Bucket Brigade Delay replacement

Bucket Brigade Delay, impossible to find at decent prices

My solution is a module that directly replaces the SAD4096

used in DOD 680, MXR M-166, M-205 Stereo Chorus, M-206, Omni, also in Pinball machines Bally Centaur and Centaur II.

SM304A - Siemens Keyboard Encoder

Typical symptoms of a malfunction of this chip are:
-Half keyboard not working (one chip damaged)
-The whole keyboard not working (two chips damaged)
-One or several keys not working.

Used in Korg BX-3, CX-3, Elka X-50, Viscount OP-3, OP-6 and many other organs.

SM305A - Siemens Tone Generator

Used in Korg BX-3, CX-3, Elka X-50, Viscount OP-3, OP-6 and many other organs.

SM305B - Siemens

Solid State Micro Technology for Music

SSM2024 - Quad VCA

Octave Plateu Voyetra Eight, Siel DK600, DK700, Opera 6 and Kiwi, Waldorf Wave

SSM2031 - High frequency Oscillator / Voltage to frequency converter

Used in Siel DK 70, DK 80
Solid State Micro Technology for Music

SSM2040 - 4 section VCF

Famously used in Sequential Circuits Prophet 5 Rev 1 & 2, Crumar Performer 2
Solid State Micro Technology for Music

SSM2044 - 4-Pole VCF

Korg Mono/Poly, Polysix, PPG Wave 2.2/2.3, Kawai/Teisco SX-210, SX-240, K3 and K3m, E-MU SP-12, Drumulator

Solid State Micro Technology for Music

SSM2045 - Music Voicing System : VCF (2-Pole and 4-Pole Low Pass) and Mixer/VCA

Used in E-MU Emulator-II, Fairlight CMI II/IIx, Siel DK-80, EX-80, DK700, Solton SM100, Suzuki SX-500
Solid State Micro Technology for Music

SSM2056 - Voltage Controlled ADSR type Envelope Generator

Used in Korg Polysix, Poly-61, Siel DK600, DK700, Opera 6 and Kiwi, Solton SM100, etc.
Solid State Micro Technology for Music

SSM2300 - 8-Channel Multiplexed Sample&Hold

This chip was initially created by SSM (Solid State Micro Technology for Music) but later in 1988, they sold the rights to PMI (Precision Monolithics, Inc). PMI also sold the rights in 1991 to Analog Devices. Analog Devices does not produce it anymore but you will find them with those different brands and they all are the same product.

Used in Ensoniq ESQ-1, SQ-80, Akai VX600, E-MU Emax, Simmons MTX9