[Apr/16/2003]

Big Bang
NMK, 1993

This game is an alternative title of Thunder Dragon 2.
PCB has an official "BIG WEST Macross" sticker on it, so it appears 
this game is a conversion on a 'Macross 2' PCB.

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


BP923AN
|------------------------------------------------------------------|
|    YM2203C  Z80     EPROM.2    62256 62256 5164 62256 62256 5164 |
|                       6264                                       |
|      M6295   WW93091.6  NMK112 62256 62256 5164 62256 62256 5164 |
|Y3014 M6295   WW93091.5                                           |
|                            16MHz                                 |
|             NMK005  DSW2   12MHz                                 |
|                     DSW1                       NMK009  NMK009    |
|                                                                  |
|J                                                                 |
|A    NMK111   6116                6116                            |
|M             6116                6116    NMK008                  |
|M                                                                 |
|A                                                      WW93091.8  |
|                                                       WW93091.7  |
|                                                                  |
|  62256  62256    NMK901                       62256   62256      |
|    WW93091.4                                          EPROM.3    |
|                                                                  |
| NMK111           NMK903                                          |
|                                                                  |
| NMK111 EPROM.1   NMK903  82S135.10                    MC68000P12 |
| 6116                                                     10MHz   |
| 6116             NMK902  82S129.9                                |
|------------------------------------------------------------------|

Notes:
         68k clock: 10.000MHz
         Z80 clock: 6.000MHz
             VSync: 57Hz
             HSync: 15.34kHz
       M6295 clock: 4.000MHz  \
          M6295 SS: L         / Therefore sampling freq. = 24.24242424kHz (i.e. 4000000/165)
      YM2203 clock: 1.500MHz
        
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