[MAME]

Grobda
Namco, 1984

PCB Layout
----------

Top Board

PCB Number: 22109611 (22109631)
  |---------------------------------|
  |  0773         1502              |
  |  PAL          GR1-3.3M          |
  |               8148       VOL    |
  |  6809         8148              |
  |                                 |
  |  GR1-4.1K                       |
  |                               --|
  |                               |
  |                               --|
|--|                                |
|  |                               2|
|  |                               2|
|  |                                |
|  |                               W|
|  |                     5806      A|
|  |                               Y|
|  |                     DSWB       |
|--|                                |
  |RESET_SW                         |
  |  GR2-3.1D                     --|
  |                               |
  |  GR2-2.1C                     --|
  |                      5604       |
  |  GR2-1.1B                       |
  |            PAL       1603  DSWA |
  |  6809                           |
  |                       18.432MHz |
  |---------------------------------|

Notes:
      Namco Customs:
                    0773 - Clock Divider/Sync Generator
                    1502 - Sound Generator
                    5806 - I/O interface
                    5604 - I/O interface
                    1603 - I/O control

      6809 clocks: 1.536MHz (both)
      VSync: 60.606060Hz
      22 Way Connector pinout same as Galaga, Pacland, Baraduke, Dragon Buster etc.
      8148 - SRAM 1k x4
      GR1-3.3M - PROM type 82S129
      All ROMs - EPROM type 2764


Bottom Board

PCB Number: 22109612 (22109632)
  |---------------------------------|
  |                           8148  |
  |                                 |
  |                           8148  |
  |                                 |
  |                   GR1-4.3L      |
  |                                 |
  |           2016                  |
  |                                 |
  |                                 |
|--|          2016    1204          |
|  |                                |
|  |                                |
|  |          2016                  |
|  |                                |
|  |                                |
|  |                                |
|  |          0433    GR1-5.3F      |
|--|                                |
  |                                 |
  |           2016    GR1-6.3E      |
  |                        GR1-5.4E |
  |                                 |
  |           0042    1108     PAL  |
  |                                 |
  |                        GR1-6.4C |
  |           0763    GR1-7.3C      |
  |                                 |
  |---------------------------------|

Notes:
      Namco Customs:
                    1204 - Motion Object Position
                    0433 - Motion Object Controller
                    0042 - Video Ram Addresser
                    0763 - Clock Divider/Sync Generator
                    1108 - Datashift Playfield Register

     8148 - SRAM 1k x4
     2016 - SRAM 2x x8

     GR1-4.3L   \  PROMs type 82S129
     GR1-5.4E   /
     GR1-6.4C   -  PROM  type 82S123

     GR1-5.3F   \
     GR1-6.3E   /  EPROM type 2764

     GR1-7.3C   -  EPROM type 2732

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