[MAME]

Sega Model 1 Hardware Overview
------------------------------

Note! This document is a Work-In-Progress and covers all the dumped Sega Model 1 games, including....

Star Wars Arcade (C) Sega, 1994 (partial dump only, sound ROMs are not dumped!)
Virtua Fighter   (C) Sega, 1993
Virtua Racing    (C) Sega, 1992
Wing War         (C) Sega, 1994

The Sega Model 1 system comprises several PCB's....
CPU PCB   - This is the main PCB. It holds the main CPU, some surface-mounted ROMs and the 3D co-processors
            (manufactured by Fujitsu and known as 'TGP'). The PCB is the same for all Model 1 games, but some
            games are not swappable due to a different internal 3D co-processor program.
Video PCB - There is only one known revision of this PCB so any game can use this PCB. It contains a very large
            quantity of RAM, some surface-mounted ROMs and some custom Sega video chips. The RGB and Sync is also
            outputted from this PCB. The horizontal sync is 24kHz and requires a medium resolution (24kHz) monitor.
            The video PCB is plugged in below the CPU PCB.
ROM PCB   - This PCB is the same for all games, only the type and number of ROMs differ per game. The ROM PCB is
            plugged in above the CPU PCB.
I/O PCB   - This PCB connects the CPU PCB to the input and output controls via some multi-wire connectors.
Comm PCB  - This PCB is used for communication when linking 2 PCBs together (generally for Virtua Racing only).
            It plugs in below the Video PCB.
Sound PCB - This PCB generates the sound for the game. There is no amplification of the sound here, that is done
            via the Amp PCB.
Motor PCB - This PCB is used to control the motors and steering column clutch used for the force feedback steering.
Amp PCB   - This PCB amplifies the sound generated by the sound PCB.


ROM PCB
-------

MODEL 1 MEMORY BD 837-7893 171-6079B (C) SEGA 1992
|--------------------------------------------------------------------------------------------|
|J1                                                                                          |
|J2      IC5            IC14                    IC26                   IC27                  |
|J3                                                                                          |
|J4      IC4            IC15                                                                 |
|J5                                             IC28                   IC29                  |
|J12     IC13           IC12                                                                 |
|                                                                                            |
|        IC11           IC10                    IC30                   IC31                  |
|                                                                                            |
| CN1    IC9            IC8       CN2                                                    CN3 |
|                                               IC32                   IC33                  |
|        IC7            IC6                                                                  |
|                                               84256                  84256              J11|
|        IC41           IC42                                                              J10|
|                                               84256                  84256              J9 |
|        IC39           IC40                                                              J8 |
|                                                                                         J7 |
|                                                                     315-5478            J6 |
|--------------------------------------------------------------------------------------------|
Notes:
      J1, J2, J4    - Jumpers to configure ROM sizes, all set to 2-3
      J3, J5, J6,   \
      J7, J8, J9    \
      J10, J11,     | Jumpers to configure ROM sizes, all set to 1-2
      J12           /
      CN1, CN2, CN3 - Connectors for joining ROM PCB to CPU PCB
      84256         - Fujitsu 84256 32k x8 SRAM (x4, DIP28)
      315-5478      - Lattice GAL16V8A (DIP20)

      IC4, IC5      - Hitachi HN27C1024 128k x16bit EPROM (DIP40)

      IC14, IC15    - Intel 27C040 512k x 8bit EPROM (DIP32)

      IC6, IC7, IC8,\
      IC9, IC10,    \
      IC11, IC12,   | 834000 4M MASKROM (DIP32)
      IC13,         |
      IC39, IC40,   /
      IC41, IC42    /

      IC26, IC27,   \
      IC28, IC29,   | 8316200 16M MASKROM (DIP42)
      IC30, IC31,   /
      IC32, IC33    /

      IC#   PCB
            Label   Virtua Racing    Virtua Fighter    Wing War       Star Wars Arcade
      --------------------------------------------------------------------------------
      4     B       EPR-14878A       EPR-16080         EPR-16951      -
      5     A       EPR-14879A       EPR-16081         EPR-16950      EPR-16467
      14    LO      EPR-14882        EPR-16082         EPR-16729      EPR-16468
      15    HI      EPR-14883        EPR-16083         EPR-16730      EPR-16469
      6     LO      MPR-14880        MPR-16084         MPR-16738      -
      7     HI      MPR-14881        MPR-16085         MPR-16737      -
      8     LO      MPR-14884        MPR-16086         MPR-16736      -
      9     HI      MPR-14885        MPR-16087         MPR-16735      -
      10    LO      MPR-14886        MPR-16088         MPR-16734      -
      11    HI      MPR-14887        MPR-16089         MPR-16733      -
      12    LO      MPR-14888        MPR-16090         -              -
      13    HI      MPR-14889        MPR-16091         -              -
      39    LO      MPR-14898        -                 MPR-16741      MPR-16472
      40    ML      MPR-14899        -                 MPR-16742      MPR-16473
      41    MH      MPR-14900        -                 MPR-16739      MPR-16474
      42    HI      MPR-14901        -                 MPR-16740      MPR-16475
      26    LO      MPR-14890        MPR-16096         MPR-16743      MPR-16476
      27    HI      MPR-14891        MPR-16097         MPR-16744      MPR-16477
      28    LO      MPR-14892        MPR-16098         MPR-16745      MPR-16478
      29    HI      MPR-14893        MPR-16099         MPR-16746      MPR-16479
      30    LO      MPR-14894        MPR-16100         MPR-16747      MPR-16480
      31    HI      MPR-14895        MPR-16101         MPR-16748      MPR-16481
      32    LO      MPR-14896        MPR-16102         MPR-16749      -
      33    HI      MPR-14897        MPR-16103         MPR-16750      -

      - denotes socket not populated.


CPU PCB
-------

MODEL-1 CPU BOARD 837-8886171-6298C (C) SEGA 1992
|---------------------------------------------------------------------------------------------------------------------------------|
|                        CN2                                    CN1                                   CN4                         |
|         |---------------------------------|   |---------------------------------|            |---------------|                  |
|         |---------------------------------|   |---------------------------------|            |---------------|                  |
|                                                                                                                                 |
|                       OPR-14746.68    |-|                                    5.5V_BATT                                         |-|
|       |-----------|                   | |                                                                          PC910       | |
|       |           |   OPR-14747.69    | |                                                              *1                      | |
|       | SEGA      |                   | |                                    84256     HM658128                    PC910       | |
|       | 315-5572  |                   | |CN13   |-----------|                                                                  | |CN3
|       |           |                   | |       |NEC        |                84256     HM658128                    PC910       | |
|       |           |                   | |       |D70615GD-16|                                                                  | |
|       |-----------|                   |-|       |V60        |                                                                  |-|
|                                                 |           |                                                                   |
|                                                 |           |                                                                   |
|                      32MHz                      |-----------|            |---------|     |---------|                            |
|                                                                          |SEGA     |     |SEGA     |     MB8421                 |
|       OPR-14745.65                                                       |315-5465 |     |315-5338A|                   *2       |
|                                                                          |         |     |         |                            |
|                                                                          |---------|     |---------|                            |
|       OPR-14744.64            40MHz                                                                                             |
|                                                                                      J6             CN5                         |
|                                                                                      J5      |---------------|                  |
|                                                                                      J4      |---------------|                  |
|                         3771                                                                                                    |
|       |-----------|     3771                   |-----------|                                                                    |
|       |           |                            |           |                                                                    |
|       | SEGA      |                            | SEGA      |                                                           D71051   |
|       | 315-5572  |                            | 315-5573  |                  |-----------|                                     |
|       |           |                            |           |                  |           |     M5M5178     OPR-14743.45        |
|       |           |                            |           |                  | SEGA      |     M5M5178                         |
|       |-----------|                            |-----------|                  | 315-5464  |     M5M5178     OPR-14742.44        |
|                                                                               |           |     M5M5178                         |
|                                                                               |           |                                     |
|                                                                               |-----------|                           315-5546A |
|                                                                                                                                 |
|       |-----------|                            |-----------|                                                |-----------|       |
|       |           |                            |           |                                    84256       |           |       |
|       | SEGA      |                            | SEGA      |                                    84256       | SEGA      |       |
|       | 315-5571  |                            | 315-5571  |                                    84256       | 315-5463  |       |
|       |           |                            |           |                                    84256       |           |       |
|       |           |                            |           |                                                |           |       |
|       |-----------|                            |-----------|                                                |-----------|       |
|                                                                                                                                 |
|                                                                                                     CN6                         |
|                     LED1 LED2 LED3 LED4 LED5                                                 |---------------|                  |
|       LED11         LED6 LED7 LED8 LED9 LED10                                                |---------------|                  |
|---------------------------------------------------------------------------------------------------------------------------------|
Notes:
      84256         - Fujitsu 84256A-70LL 32k x8 SRAM (x6, DIP28)
      HM658128      - Hitachi HM658128ALP-10 16k x8 SRAM (x2, DIP32)
      M5M5178       - Mitsubishi M5M5178AP-25 8k x8 SRAM (x4, DIP28)
      CN1, CN2      - Connectors to join CPU board to Video board
      CN3           - Connector for power and input/output controls (joins small adapter board to a larger filter board)
      CN4, CN5, CN6 - Connectors to join ROM board to CPU board
      CN13          - Connector for optional daughterboard (not used)
      3771          - Fujitsu MB3771 master reset IC (x2, DIP8)
      5.5_BATT      - NEC 5.5 volt battery
      PC910         - Sharp PC910 opto-isolator (x3, DIP8)
      D71051        - NEC uPD71051C-10 UART (DIP28)
      MB8421        - Fujitsu MB8421-12LP RAM? (SDIP52)
      *1            - Unpopulated position for Fujitsu MB8421
      D70615GD-16   - NEC uPD70615GD-16-S V60 CPU, running at 16.000MHz (QFP120, clock 32 / 2)
      315-5546A     - Lattice GAL16V8A (DIP20)
      315-5571      - Sega Custom (IC57/IC58, QFP160)  \
      315-5572      - Sega Custom (IC60/IC66, QFP160)  / According to test mode, these chips are the TGPs
      315-5573      - Sega Custom (QFP160)
      315-5463      - Sega Custom (QFP160)
      315-5464      - Sega Custom (QFP160)
      315-5465      - Sega Custom (QFP100)
      315-5338A     - Sega Custom (QFP100)
      *2            - Unpopulated position for 315-5338A
      J4, J5, J6    - Jumpers, all set to 2-3

      OPR-14742.44  \
      OPR-14743.45  - 1M SOP40 MASKROMs, tied to 315-5464

      OPR-14744.64  \
      OPR-14745.65  - 1M SOP40 MASKROMs, tied to both 315-5572's

      OPR-14746.68  \
      OPR-14747.69  - 1M SOP40 MASKROMs, tied to 315-5572 @ IC66


VIDEO PCB
---------

837-7894 171-6080D (C) SEGA 1992
|---------------------------------------------------------------------------------------------------------------------------------|
|                        CN2                                    CN1                                                               |
|         |---------------------------------|   |---------------------------------|                                               |
|         |---------------------------------|   |---------------------------------|                                               |
|                                                                                                                     HM65256     |
|                                                                                     J3                                          |
|   HM658512       HM658512                                        HM658128           J2                              HM65256     |
|                                        |-----------|                                      |-----------|                         |
|                                        |           |             HM658128                 |           |                         |
|                                        | SEGA      |                                      | SEGA      |             HM658128    |
|   HM654128       HM654128              | 315-5422  |                                      | 315-5292  |                         |
|                                        |           |                                      |           |             HM658128    |
|                                        |           |             M5M5178                  |           |                         |
|                                        |-----------|                                      |-----------|             HM658128    |
|   HM654128       HM654128                                        M5M5178                                                        |
|                                      |-----------|                                                                  HM658128    |
|   CY7B185           J1               |           |                                             J4                               |
|   CY7B185                            | SEGA      |                                                                              |
|   CY7B185                            | 315-5423  |        OPR-14748.16                315-5483                                  |
|   CY7B185                            |           |                                                                              |
|                                      |           |                                    315-5484                                  |
|                                      |-----------|                                                                              |
|                                                                                                                                 |
|        |-----------|                 |-----------|                                              M5M5178                         |
|        |           |                 |           |                                                                              |
|        | SEGA      |                 | SEGA      |                                              M5M5178                         |
|        | 315-5425  |                 | 315-5424  |        OPR-14748.15                                                          |
|        |           |                 |           |                                                                              |
|        |           |                 |           |                                                                              |
|        |-----------|                 |-----------|                                                                              |
|                                                                                                                                 |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                                     M5M5178                            |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256            315-5485                 M5M5178                            |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                                     M5M5178                            |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256            36MHz        315-5486                                       |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                         315-5486                                       |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                         315-5486                                       |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                                                                        |
|                                                                                                                                 |
|  HM65256         HM65256          HM65256        HM65256                                        CN4          CN3      LED1      |
|---------------------------------------------------------------------------------------------------------------------------------|
Notes:
      HM65256  - Hitachi HM65256BLSP-10 32k x8 SRAM (x34, DIP28)
      HM658128 - Hitachi HM658128ALP-10 16k x8 SRAM (x10, DIP32)
      HM658512 - Hitachi HM658512LP-8 64k x8 SRAM (x2, DIP32)
      M5M5178  - Mitsubishi M5M5178AP-25 8k x8 SRAM (x7, DIP28)
      CY7B185  - Cypress CY7B185 8k x8 SRAM (x4, DIP28)
      J1       - Jumper, set to 2-3
      J2       - Jumper, set to 1-2
      J3       - Jumper, set to 2-3
      J4       - Jumper, set to 1-2
      CN1, CN2 - Connectors to join Video board to CPU board
      CN3      - Connector for R/G/B/Sync output (@ 24kHz)
      CN4      - 20 pin IDC flat-cable connector (purpose unknown)
      315-5483 - PAL CK2605 (DIP20)
      315-5484 - Lattice GAL16V8A (DIP20)
      315-5485 - Lattice GAL16V8A (DIP20)
      315-5486 - Lattice GAL16V8A (x3, DIP20)
      315-5422 - Sega Custom (QFP160)
      315-5423 - Sega Custom (QFP160)
      315-5424 - Sega Custom (QFP160)
      315-5425 - Sega Custom (QFP160)
      315-5292 - Sega Custom (QFP160)

      OPR-14748.15  \
      OPR-14748.16  - 1M SOP40 MASKROMs, tied to 315-5423 & 315-5424. Note both ROMs are identical.


I/O PCB
-------

837-8950-01 (C) SEGA 1992
|-------------------------------------------|
| CN6                           J3   J2     |
|                                        CN5|
|                      DSW3       LED1      |
|                                           |
| SW7    |---------|                        |
|  32MHz |SEGA     |   DSW1                 |
| SW6    |315-5338A|                        |
|        |         |                        |
| SW5    |---------|   DSW2                 |
|                                        CN1|
| SW4      MB8464                           |
|          14869.25                         |
|   3771                                    |
|          Z80                              |
|   93C45                                   |
|                               PC910 PC910 |
|   LED2                           J1       |
|      M6253                                |
| CN3              CN2          CN4     TL1 |
|-------------------------------------------|
Notes:
      315-5338A - Sega Custom (QFP100)
      Z80       - Zilog Z0840004PSC Z80 CPU, running at 4.000MHz (DIP40, clock 32 / 8)
      14869.25  - ST Microelectronics M27C512 64k x8 EPROM (DIP28, labelled 'EPR-14869')
                  There is an alternative revision B 'EPR-14869B' also
      MB8464    - Fujitsu MB8464 8k x8 SRAM (DIP28)
      93C45     - 128bytes x8 EEPROM (DIP8)
      M6253     - OKI M6253 (DIP18)
      3771      - Fujitsu MB3771 Master Reset IC (DIP8)
      PC910     - Sharp PC910 opto-isolator (x2, DIP8)
      DSW1/2/3  - 8-position Dip Switch (x3)
      J1        - Jumper, set to 2-3
      J2, J3    - Jumper, both set to 1-2
      CN1       - 50 pin connector (joins to control panel assembly)
      CN2       - 26 pin connector (joins to foot pedal assembly)
      CN3       - 10 pin connector for power input
      CN4       - 6 pin connector (joins to sound PCB -> CN2, used for sound communication from Main PCB to Sound PCB)
      CN5       - 12 pin connector for input/output controls
      CN6       - 12 pin connector (joins to Motor PCB)
      TL1       - Connector for network optical cable link
      SW7       - Push Button Service Switch
      SW6       - Push Button Test Switch
      SW5, SW4  - Push Button Switches (purpose unknown)


Motor PCB
---------

SJ25-0155-01 838-9081
|------------------------------------------------------|
|          CN6                      CN7        CN8     |
|CN1                                    6A             |
|                         DSW2                         |
|        |---------|                 2A    C4149       |
|        |SEGA     |      DSW1                      CN9|
|        |315-5296 |                                   |
|        |         |                               CN10|
|        |---------|                MB3759             |
|                                                   C11|
|CN2                   |---------|                     |
|                      |SEGA     |                     |
|          8MHz        |315-5296 |                     |
|                      |         |                     |
|      315-5625        |---------|                     |
|           3771                                       |
|CN3            3773                                   |
|                                    2A                |
|              Z80                          C4149      |
|                                                      |
|              15111.12                            CN12|
|                                   MB3759             |
|           M6253   6264                               |
|                                                      |
|CN4        CN5      7-SEG                             |
|------------------------------------------------------|
Notes:
      There are also many capacitors/transistors and other power-related components which are not shown.

      315-5296 - Sega Custom (QFP100)
      7-SEG    - 7-Segment Display (x4), used for PCB status/diagnostics
      15111.12 - ST Microelectronics M27C512 64k x8 EPROM (DIP28, labelled 'EPR-15111')
      Z80      - Zilog Z0840004PSC Z80 CPU, running at 4.000MHz (DIP40, clock 8 / 2)
      MB8464   - Fujitsu MB8464 8k x8 SRAM (DIP28)
      3771     - Fujitsu MB3771 Master Reset IC (DIP8)
      3773     - Fujitsu MB3771 Master Reset IC with Watchdog Timer (DIP8)
      2A       - Fuse, 2 Amp
      6A       - Fuse, 6 Amp
      MB3759   - Fujitsu MB3759 Switching Regulator Controller (x2, DIP16)
      CN1, CN2 - Connects to Left Side I/O PCB
      CN3, CN4 - Connects to Right Side I/O PCB
      CN5      - Connects to Steering Voltage Regulator (Left and Right Sides)
      CN6      - Connects to Power Supply (+5V)
      CN7, CN8 - Connects to 28VAC transformer
      CN9      - 2 pin connector (not used?)
      CN10     - 2 pin connector (not used?)
      CN11     - 7 pin connector (joins to Motor and Clutch Left Side)
      CN12     - 7 pin connector (joins to Motor and Clutch Right Side)
      DSW1/2   - 8-position Dip Switch (x2)
                 +-------------------------------------------------+
                 |DSW1               1   2   3   4   5   6   7   8 |
                 +---------+-------+---+---+---+---+---+---+---+---+
                 |Feedback | Light |OFF|OFF|OFF|   |   |   |   |   |
                 |Weight   |       +---+---+---+   |   |   |   |   |
                 |PL1      |  /\   |ON |OFF|OFF|   |   |   |   |   |
                 |         |  ||   +---+---+---+   |   |   |   |   |
                 |         |       |OFF|ON |OFF|   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         |       |ON |ON |OFF|   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         |       |OFF|OFF|ON |   |   |   |   |   |
                 |         |  ||   +---+---+---+   |   |   |   |   |
                 |         |  \/   |ON |OFF|ON |   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         | Heavy |ON |ON |ON |   |   |   |   |   |
                 +---------+-------+---+---+---+---+   |   |   |   |
                 |Power On | Yes   |           |OFF|   |   |   |   |
                 |Check    +-------+-----------+---+   |   |   |   |
                 |         | No    |           |ON |   |   |   |   |
                 +---------+-------+-----------+---+---+---+   |   |
                 |Not Used |                       |OFF|OFF|   |   |
                 +---------+-----------------------+---+---+---+---+
                 |Not Used |                               |OFF|OFF|
                 +---------+-------------------------------+---+---+

                 +-------------------------------------------------+
                 |DSW2               1   2   3   4   5   6   7   8 |
                 +---------+-------+---+---+---+---+---+---+---+---+
                 |Feedback | Light |OFF|OFF|OFF|   |   |   |   |   |
                 |Weight   |       +---+---+---+   |   |   |   |   |
                 |PL2      |  /\   |ON |OFF|OFF|   |   |   |   |   |
                 |         |  ||   +---+---+---+   |   |   |   |   |
                 |         |       |OFF|ON |OFF|   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         |       |ON |ON |OFF|   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         |       |OFF|OFF|ON |   |   |   |   |   |
                 |         |  ||   +---+---+---+   |   |   |   |   |
                 |         |  \/   |ON |OFF|ON |   |   |   |   |   |
                 |         |       +---+---+---+   |   |   |   |   |
                 |         | Heavy |ON |ON |ON |   |   |   |   |   |
                 +---------+-------+---+---+---+---+   |   |   |   |
                 |Power On | Yes   |           |OFF|   |   |   |   |
                 |Check    +-------+-----------+---+   |   |   |   |
                 |         | No    |           |ON |   |   |   |   |
                 +---------+-------+-----------+---+---+---+---+---+
                 |7-SEG LED|Display V.R. Value 00-80-FF    |OFF|OFF|
                 |         +-------------------------------+---+---+
                 |         |Display Clutch Value           |ON |OFF|
                 |         +-------------------------------+---+---+
                 |         |Data from the I/O Board (00-FF)|OFF|ON |
                 |         +-------------------------------+---+---+
                 |         |Data to the I/O Board (00-FF)  |ON |ON |
                 +---------+-------------------------------+---+---+


Comm PCB
--------

MODEL-1 COMMUNICATION BD 837-8842 171-6293B (C) SEGA 1992
|--------------------------------------------------------------------------------|
|                                                                                |
|    MB89237A            MB89374                                                 |
|       JP4                                                                 LED1 |
|    15112.17            Z80                                                     |
|    JP2  JP3                                                       75179        |
|    MB8464              315-5624                                     JP6        |
|                                                       315-5547                 |
|        315-5611                                            SW1    PC910     CN4|
|                                                                                |
|                                                                   PC910     CN5|
|     MB8421             MB8431                                JP7               |
|                                                                   JP5          |
|        JP8                                                                  CN7|
|                CN1                                    CN2                      |
| |---------------------------------|   |---------------------------------|   CN6|
| |---------------------------------|   |---------------------------------|      |
|--------------------------------------------------------------------------------|
Notes:
      15112.17 - AMD AM27C100 128k x8 EPROM (DIP32, labelled 'EPR-15112')
      Z80      - Zilog Z0840004PSC Z80 CPU, running at 4.000MHz (DIP40)
      MB8464   - Fujitsu MB8464 8k x8 SRAM (DIP28)
      MB8421   - Fujitsu MB8421-12LP RAM? (SDIP52)
      MB8431   - Fujitsu MB8431-90LP RAM? (SDIP52)
      MB89237A - Fujitsu MB89237A ? (DIP20)
      MB89374  - Fujitsu MB89374 ? (SDIP42)
      75179    - Texas Instruments SN75179 Differential Driver and Receiver Pair (DIP8)
      315-5547 - AMI 18CV8PC-25 PAL (DIP20)
      315-5624 - MMI PAL16L8BCN PAL (DIP20)
      315-5611 - Lattice GAL16V8A PAL (DIP20)
      PC910    - Sharp PC910 opto-isolator (x2, DIP8)
      SW1      - Push Button Switch (purpose unknown)
      CN1, CN2 - Connectors to join Comm board to Video board
      CN4      - 8 pin connector (purpose unknown)
      CN5      - 6 pin connector (purpose unknown)
      CN6, CN7 - Connectors for network optical cable link
      JP2      - Jumper, set to 2-3
      JP3      - Jumper, set to 1-2
      JP4      - Jumper, set to 1-2
      JP5      - Jumper, shorted
      JP6      - Jumper, not shorted
      JP7      - Jumper, not shorted
      JP8      - Jumper, set to 1-2


Sound PCB
---------

MODEL-1 SOUND BD 837-8679 (C) SEGA 1992
|-----------------------------------------------------------|   SOUND BD OPTION 837-8680 (C) SEGA 1992
| CN2                    CN1                 CN5  CN6  CN7  |   |--------------------------|
|                   LED5               CN9                  |   |  CN2    CN3  CN4 CN5     |
| PC910                                               TL062 |   |              uPC844C     |
|                JP5                           TL062        |   |     LC78820        TL062 |
| JP3     IC8    JP6                                        |   |                          |
| JP4                MB8464    82C51                 uPC844C|   |             IC5          |
|                    MB8464                YM3438           |   |                          |
| JP1     IC7                                               |   |    IC3                   |
| JP2                                                       |   |             IC4          |
|                                                  LC78820  |   | LED                      |
|                  315-5578                16MHz            |   |JP6           |---------| |
|                                                           |   |JP5           |SEGA     | |
|                  315-5577                                 |   |JP4           |315-5560 | |
|                                                           |   |JP3  315-5579 |         | |
|                           |---------|                     |   |JP2           |---------| |
| |-----------------|       |SEGA     |    CN8              |   |JP1    CN1                |
| |  TMP68000N-10   |       |315-5560 |          315-5579   |   |--------------------------|
| |                 |       |         |                     |   Notes:
| |-----------------|  JP7  |---------|          IC33       |         JP1, JP2 - Jumpers, both set to 2-3
|                                         IC31              |         JP3, JP4,- Jumpers, all set to 1-2
|   LED1 LED2 LED3 LED4                          IC32       |         JP5, JP6 /
|DSW1                3771      20MHz                        |         CN1, CN2 - Connectors to join Sound Option Board to Main Sound Board
|-----------------------------------------------------------|         CN3      - 5 pin connector, unamplified sound out to Amp PCB
                                                                      CN4, CN5 - Unamplified audio output, left/right RCA audio connectors (not used)
Notes:
      TMP68000N-10- Toshiba TMP68000N-10 CPU, running at 10.000MHz (SDIP64, clock 20 / 2)
      82C51       - Toshiba 82C51AM-10 Programmable 8-bit I/O Serial Interface (SOP28)
      DSW1        - 4 position Dip Switch
      MB8464      - Fujitsu MB8464 8k x8 SRAM (DIP28)
      3771        - Fujitsu MB3771 Master Reset IC (DIP8)
      TL062       - ST Microelectronics Dual Low Power Operational Amplifier (DIP8)
      PC910       - Sharp PC910 opto-isolator (DIP8)
      LC78820     - Sanyo LC78820 2-channel 18-bit D/A Converter (DIP20)
      uPC844C     - NEC uPC844C Quad High Speed Wide Band Operational Amplifier (DIP14)
      315-5560    - Sega Custom (QFP100)
      315-5577    - Lattice GAL16V8A (DIP20)
      315-5578    - Lattice GAL16V8A (DIP20)
      315-5579    - Lattice GAL16V8A (DIP20)
      YM3438      - Yamaha YM3438 sound chip, running at 8.000MHz (DIP24, clock 16 / 2)
      JP1, JP2    - Jumpers to configure ROM size of IC7, both set to 2-3
      JP3, JP4    - Jumpers to configure ROM size of IC8, both set to 2-3
      JP5, JP6    - Jumpers to configure size of RAM, both set to 2-3
      JP7         - Jumper, set to 2-3
      JP13, JP14, \
      JP15, JP16, | Jumpers to configure size of ROMs at IC31, IC32 & IC33
      JP17, JP18  / JP13 & JP14 set to 2-3, others set to 1-2
      CN1         - 10 pin connector for power input (+5V, GND, +12V)
      CN2         - 6 pin connector (joins to main PCB, used for sound communication from Main PCB to Sound PCB)
      CN5         - 5 pin connector, unamplified sound out to Amp PCB
      CN6, CN7    - Unamplified audio output, left/right RCA audio connectors (not used)
      CN8, CN9    - Connectors to join Sound Option Board to Main Sound Board

      Sound Main PCB
      --------------

                    IC#   PCB
                          Label        Virtua Racing    Virtua Fighter    Wing War     Star Wars Arcade
                    -----------------------------------------------------------------------------------
                    7     1024/4096    EPR-14870A       EPR-16120         EPR-16751    !
                    8     1024/4096    -                EPR-16121         EPR-16752    ?
                    31    27C4001      -                -                 -            ?
                    32    23C16000     MPR-14873        MPR-16122         MPR-16753    !
                    33    23C16000     -                MPR-16123         MPR-16754    ?

      Sound Sub PCB
      -------------

                    IC#   PCB
                          Label        Virtua Racing    Virtua Fighter    Wing War     Star Wars Arcade
                    -----------------------------------------------------------------------------------
                    3     27C4001      -                -                 -            ?
                    4     23C16000     MPR-14876        MPR-16124         MPR-16755    ?
                    5     23C16000     -                MPR-16125         MPR-16756    ?

                    - denotes socket known to be not populated.
                    ! denotes known to be not dumped.
                    ? denotes unknown if socket is populated or not, but not dumped either way.


Audio Mix PCB
-------------

839-0542 (C) SEGA 1992
|-------------|
|             |
|             |
|CN1  CN3  CN2|
|             |
|             |
|-------------|
Notes:
      This is a very small PCB with only 3 connectors on it and 4 resistors
      which simply mixes the left/right audio into one overall output which
      is fed into the Amp PCB.
      CN1 - 5 pin connector, right channel audio input
      CN2 - 5 pin connectos, mixed audio output to Amp PCB
      CN3 - 5 pin connector, left channel audio input


Amp PCB
-------

838-10018 SJ25-0168-03
|----------------------------------|
|             CN1                  |
|                        7812   CN2|
|CN3                               |
|                                  |
|                        TA8225H   |
|                                  |
|                               CN4|
|                                  |
|                                  |
|                        TA8225H   |
|                                  |
|LCH                               |
|RCH                               |
|----------------------------------|
Notes:
      There are also many capacitors/transistors and other power-related
      components which are not shown.

      7812     - 12V voltage regulator
      TA8225H  - Toshiba TA8225H 45W power amplifier (x2)
      CN1      - 3 pin connector, 12VAC power input
      CN2      - 2 pin 12VDC power output
      CN3      - 7 pin connector, joins to credit board and coin mech (power/credit related outputs)
      CN4      - 4 pin connector, amplified dual (left/right) speaker audio outputs
      RCH, LCH - RCA connectors, left/right sound input from CN2 of Audio Mix PCB


-