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M114A - Digital Sound Generator - SGS

M5451B7 LED display driver

Used in Siel DK 70, DK 80

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