Table of Contents

Headers & Harnesses

Diagrams created with WireViz.

Power Block <-> Transformer

Schematic | Picture PSU-CPU Harness

connectors:
   Power Block Mains:
      pinout: [Hot, Neutral]
   Power Block J2:
      pinout: [P2-1, P2-2, P2-3, P2-4, P2-5, P2-6, P2-7, P2-8, P2-9]
   Transformer:
      pinout: [GND, 100Vac, 120Vac, 220Vac, 240Vac]
   Power Switch:
      pinout: [A, B]
   Voltage Selector:
      pinout: [100Vac, 120Vac, 220Vac, 240Vac, Input]

cables:
   W1:
      colors: [WH, BU, GN, YE, OG]
   Power Block Traces:
      colors: [BU, GN, YE, OG]
   Power Block Trace:
      colors: [BK]
   W2:
      colors: [GY,BN]

connections:
   -
      - Transformer: [1,2,3,4,5]
      - W1: [1-5]
      - Power Block J2: [1,3,4,6,7]
   -
      - Voltage Selector: [1-4]
      - Power Block Traces: [1-4]
      - Power Block J2: [3,4,6,7]
   -
      - Voltage Selector: [5]
      - Power Block Trace: [1]
      - Power Block Mains: [1]
   -
      - Power Switch: [1]
      - W2: [1]
      - Power Block J2: [9]
   -
      - Power Switch: [2]
      - W2: [2]
      - Power Block Mains: [2]

Transformer <-> PSU

Schematic | Picture PSU-CPU Harness

connectors:
   Transformer:
      pinout: [5Vac, GND, 5Vac, 12Vac, GND, 12Vac]
   PSU J1:
      pinout: [5Vac, GND, 5Vac, 12Vac, GND, 12Vac]

cables:
   W1:
      colors: [RD, BK, RD, BN, GY, BN]

connections:
   -
      - PSU J1: [1-6]
      - W1: [1-6]
      - Transformer: [1-6]

PSU <-> Audio Controls

PSU Schematic | Volume Slider Schematic PSU-CPU Harness

connectors:
   PSU J4:
      pinout: [' ', ' ', ' ', GND, GND, +5Vdc, +5Vdc, -12Vdc, +12Vdc, ' ', GND, ' ', -12Vdc]
   Audio Board J-PS:
      pinout: [+5Vdc, +5Vdc, GND, GND, ' ']
   Audio Board J-AN:
      pinout: [3.2Vdc, 3.2Vdc, AN0 (Pitch Bender Signal), AN1 (Mod Wheel Signal), AN2 (Data Slider Signal), AN3, GND, GND]
   Main Board J15:
      pinout: [' ', ' ', ' ', GND]
   Volume Slider J2:
      pinout: [GND, RIGHT, LEFT, GND, -12Vdc, +12Vdc]
   Headphone Jack:
      pinout: [SLEEVE, TIP, RING]
   Input Wheels Junction:
      pinout: [-12Vdc, 'Pitch Bender Signal', 'Mod Wheel Signal',' ',' ']
   Mod Wheel:
      pinout: [-12Vdc, WIPER, ' ']
   Pitch Bender:
      pinout: [-12Vdc, WIPER, ' ']
   Data Slider:
      pinout: [3.2Vdc, WIPER, GND]

cables:
   Audio Board Power:
      colors: [RD, RD, BK, BK]
   Data Slider Pigtail:
      colors: [OG, BU, BK]
   Headphone Output:
      colors: [BK, RD, WH]
   Input Wheels:
      colors: [BN, YE]
   Input Wheels Power/Reference (+) - UNCONFIRMED:
      colors: [BK]
   Input Wheels Power/Reference (-):
      colors: [OG]
   Main Board J15 Pigtail:
      colors: [WH, BK]
   Mod Wheel Pigtail:
      colors: [BU, YE, RD]
   Pitch Bender Pigtail:
      colors: [BU, GN, RD]
   Volume Slider Power/Reference:
      colors: [BK, VT, BU]

connections:
   -
      - Audio Board J-PS: [1-4]
      - Audio Board Power: [1-4]
      - PSU J4: [7,6,5,4]
   -
      - Volume Slider J2: [4-6]
      - Volume Slider Power/Reference: [1-3]
      - PSU J4: [11,13,9]
   -
      - Volume Slider J2: [1-3]
      - Headphone Output: [1-3]
      - Headphone Jack: [1-3]
   -
      - Main Board J15: [1,4]
      - Main Board J15 Pigtail: [1,2]
      - Audio Board J-AN: [6,7]
   -
      - Input Wheels Junction: [5]
      - Input Wheels Power/Reference (+) - UNCONFIRMED: [1]
      - Main Board J15: [3]
   -
      - Input Wheels Junction: [1]
      - Input Wheels Power/Reference (-): [1]
      - PSU J4: [8]
   -
      - Pitch Bender: [1-3]
      - Pitch Bender Pigtail: [1-3]
      - Input Wheels Junction: [1,2,5]
   -
      - Mod Wheel: [1-3]
      - Mod Wheel Pigtail: [1-3]
      - Input Wheels Junction: [1,3,5]
   -
      - Input Wheels Junction: [2,3]
      - Input Wheels: [1,2]
      - Audio Board J-AN: [3,4]
   -
      - Data Slider: [1-3]
      - Data Slider Pigtail: [1-3]
      - Audio Board J-AN: [2,5,8]

PSU <-> CPU

Schematic PSU-CPU Harness

connectors:
   PSU J2:
      pinout: [+5V (Backup), PCK, RESET, GND (Digital), GND (Digital), +5V, +5V, +12V, GND (Analog), -12V]
   CPU J4:
      pinout: [GND (Digital), GND (Digital), +5V, +12V, -12V, GND (Analog), +5V (Backup), +5V, PCK, RESET]

cables:
   W1:
      wirecount: 10
      colors: [BK, BK, RD, BU, OG, BK, RD, RD, VT, YE]

connections:
   -
      - CPU J4: [1-10]
      - W1: [1-10]
      - PSU J2: [4,5,6,8,10,9,1,7,2,3]

Chips

Position Part Number Description Mount Picture
U1 M74LS244P Octal Buffer / Line Driver Fixed Picture
U2 M74LS273P Octal Flip Flop Fixed Picture
U3 SN74S04N Hex Inverters Fixed Picture
U4 M74ALS32P Quad 2-Input Positive OR Gates Fixed Picture
U5 M74LS138P 3-to-8 Decoder / Demultiplexer Fixed Picture
U6 M74LS04P Hex Inverters Fixed Picture
U7 74F112PC Dual JK LE Flip Flop Fixed Picture
U8 PALC22V10-35PC CMOS Programmable Array Logic Socket Picture
U9 M74LS244P Octal Buffer / Line Driver Fixed Picture
U10 M5216 Dual Op-Amp Fixed Picture
U11 M74LS244P Octal Buffer / Line Driver Fixed  
U12 M74LS244P Octal Buffer / Line Driver Fixed Picture
U13 74F08PC Quad 2-Input AND Gate Fixed Picture
U14 M74ALS151AP 1-of-8 Data Selector / Multiplexer Fixed Picture
U15 M74ALS32P Quad 2-Input Positive OR Gates Fixed Picture
U16 KMS66000101A Arnold Chip (KMS Proprietary?) Socket Picture
U17 MC68000P10 10MHz CPU Fixed  
U18 C4072C J-FET Input Dual Op-Amp Fixed Picture
U19 D43256AC-15L 32K RAM Fixed Picture
U20      
U21 M5M27C101K-2 Software Engine EPROM (HI) Socket  
U22      
U23 M74LS244P Octal Buffer / Line Driver Fixed Picture
U24 M74LS244P Octal Buffer / Line Driver Fixed Picture
U25 74F175PC Quad D-Type Flip-Flop Fixed Picture
U26 74F374PC Octal D-Type Flip-Flop with 3-STATE Outputs Fixed Picture
U27 M74ALS02P Quad 2-Input Positive NOR Gate Fixed Picture
U28 SN74S04N Hex Inverters Fixed Picture
U29 KMS66000101A Arnold Chip (KMS Proprietary?) Socket Picture
U30 D43256AC-15L 32K RAM Fixed Picture
U31      
U32 M5M27C101K-2 Software Engine EPROM (LO) Socket  
U33      
U34 M74LS245P Octal Bus Transciever Fixed  
U35 M74LS244P Octal Buffer / Line Driver Fixed Picture
U36 M74LS244P Octal Buffer / Line Driver Fixed Picture
U37 M74ALS244AP Octal Buffer / Line Driver Fixed Picture
U38      
U39 M74LS245P Octal Bus Transciever Fixed Picture
U40 M74LS244P Octal Buffer / Line Driver Fixed Picture
U41 M74LS257AP Quad Multiplexer Fixed Picture
U42 M74LS257AP Quad Multiplexer Fixed Picture
U43 M74LS257AP Quad Multiplexer Fixed Picture
U44     Picture
U45 M74LS02P Quad 2-Input NOR Gate Fixed Picture
U46      
U47      
U48 HD63B40P 2MHz Programmable Timer Module Fixed  
U49 M74ALS138P 3-to-8 Decoder / Demultiplexer Fixed Picture
U50 A00100Y-02 Sound EPROM (Stock) Socket Picture
U51 A00200Y-02 Sound EPROM (Stock) Socket Picture
U52 [Empty] Sound EPROM (Upgrade) Socket Picture
U53 [Empty] Sound EPROM (Upgrade) Socket Picture
U54 A00100Z-03 Sound EPROM (Stock) Socket Picture
U55 A00200Z-03 Sound EPROM (Stock) Socket Picture
U56 [Empty] Sound EPROM (Upgrade) Socket Picture
U57 [Empty] Sound EPROM (Upgrade) Socket Picture
U58 A00100X-01 Sound EPROM (Stock) Socket Picture
U59 A00200X-01 Sound EPROM (Stock) Socket Picture
U60 [Empty] Sound EPROM (Upgrade) Socket Picture
U61 [Empty] Sound EPROM (Upgrade) Socket Picture
U62 C4570C Dual OpAmp Fixed Picture
U63 C4570C Dual OpAmp Fixed Picture
U64 M74LS74AP Dual D-Type Positive Flip-Flops Fixed Picture
U65 PCM56P 16-bit DAC Socket Picture
U66 PCM56P 16-bit DAC Socket Picture
U67 MC68B50P Asynchronous Communications Interface Adaptor Fixed  
U68 M74LS367AP Hex Bus Driver Fixed  
U69      
U70 M74LS165AP 8-Bit Parallel-In Serial-Out Shift Register Fixed Picture
U71      
U72      
U73      
U74      
U75      
U76      
U77      
U78      
U79      
U80      
U81      
U82      
U83      
U84      
U85      
U86      
U87      
U88      
U89      
U90      
U91      
U92      
U93      
U94      
U95      
U96      
U97      
U98      
U99      
U100      
U101      
U102 MC68B50P Asynchronous Communications Interface Adaptor Fixed