[MAME]

System16A Hardware Overview
---------------------------

The games on this system include... (there may be more??)
Action Fighter (C) Sega 1985
Alex Kidd      (C) Sega 1986
Fantasy Zone   (C) Sega 1986
SDI            (C) Sega 1987
Shinobi        (C) Sega 1987
Tetris         (C) Sega 1988

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

Top PCB

171-5306 (number under PCB, no numbers on top)
         |----------|     |-----------|     |-----------|
  |------|----------|-----|-----------|-----|-----------|------|
|-|      16MHz    25.1478MHz                                   |
| |                                  315-5149                  |
|-|    YM3012 YM2151  ROM.IC24 ROM.IC41                        |
  | VOL                                                        |
  |                   ROM.IC25 ROM.IC42  MB3771                |
|-|         D8255                           315-5155           |
|                     ROM.IC26 ROM.IC43     315-5155  ROM.IC93 |
|S                                                             |
|E          Z80A      TC5565   TC5565       315-5155  ROM.IC94 |
|G                315-5141                  315-5155           |
|A         ROM.IC12                                   ROM.IC95 |
|5                                          315-5155           |
|6          2016                            315-5155           |
|                                                     2016     |
|-|                                       8751                 |
  |        DSW2        |-------------|                2016     |
|-|                    |    68000    | 315-5244                |
|                      |-------------|       315-5142          |
|          DSW1                                                |
|                        10MHz                                 |
|--------------------------------------------------------------|
Notes:
      68000    - running at 10.000MHz. Is replaced with a Hitachi FD1094 in some games.
      Z80      - running at 4.000MHz [16/4]
      YM2151   - running at 4.000MHz [16/4]
      2016     - Fujitsu MB8128 2K x8 SRAM (DIP24)
      TC5565   - Toshiba TC5565 8K x8 SRAM (DIP28)
      8751     - Intel 8751 Microcontroller. It appears to be not used, and instead, games use a small plug-in board
                 containing only one 74HC04 TTL IC. The daughterboard has Sega part number '837-0068' & '171-5468' stamped onto it.
      315-5141 - Signetics CK2605 stamped '315-5141' (DIP20)
      315-5149 - 82S153 Field Programmable Logic Array, sticker '315-5149'(DIP20)
      315-5244 - 82S153 Field Programmable Logic Array, sticker '315-5244'(DIP20)
      315-5142 - Signetics CK2605 stamped '315-5142' (DIP20)
      315-5155 - Custom Sega IC (DIP20)

                         Sound     |---------------------- Main Program --------------------|  |---------- Tiles ---------|
                         Program
Game           CPU       IC12      IC24      IC25      IC26      IC41      IC42      IC43      IC93      IC94      IC95
---------------------------------------------------------------------------------------------------------------------------
Action Fighter 317-0018  EPR10284  EPR10353  EPR10351  EPR10349  EPR10352  EPR10350  EPR10348  EPR10283  EPR10282  EPR10281
Alex Kid       317-0021  EPR10434  -         EPR10428  EPR10427  -         EPR10429  EPR10430  EPR10433  EPR10432  EPR10431
Alex Kid (Alt) 317-0021  EPR10434  -         EPR10446  EPR10445  -         EPR10448  EPR10447  EPR10433  EPR10432  EPR10431
Fantasy Zone   68000     EPR7535   EPR7384   EPR7383   EPR7382   EPR7387   EPR7386   EPR7385   EPR7390   EPR7389   EPR7388
SDI            317-0027  EPR10759  EPR10752  EPR10969  EPR10968  EPR10755  EPR10971  EPR10970  EPR10758  EPR10757  EPR10756
Shinobi        317-0050  EPR11267  -         EPR11261  EPR11260  -         EPR11262  EPR11263  EPR11266  EPR11265  EPR11264
Tetris         317-0093  EPR12205  -         -         EPR12200  -         -         EPR12201  EPR12204  EPR12203  EPR12202


Bottom PCB

171-5307 (number under PCB, no numbers on top)
         |----------|     |-----------|     |-----------|
|--------|----------|-----|-----------|-----|-----------|------|
|                                           315-5144           |-|
|                                                              | |
|                                                              |-|
|        2148 2148 2148                                        |
|                              ROM.IC24    ROM.IC11            |
|        2148 2148 2148  ROM.IC30   ROM.IC18                   |
|                                                   D7751      |
|                                                        6MHz  |
|                              ROM.IC23    ROM.IC10     D8243C |
|            315-5049    ROM.IC29   ROM.IC17                   |
|                                                              |
|                  315-5106    315-5108                        |
|                        315-5107     2018  2018               |
|                                                              |
|            315-5049                                          |
|                                              ROM.IC5 ROM.IC2 |
|TC5565 TC5565                  315-5011                       |
|                                                              |
|               2016  315-5143       315-5012  ROM.IC4 ROM.IC1 |
|TC5565 TC5565  2016                                           |
|--------------------------------------------------------------|
Notes:
      D7751    - NEC uPD7751C Microcontroller, running at 6.000MHz. This is a clone of an 8048 MCU
      D8243C   - NEC D8243C (DIP24)
      2016     - Fujitsu MB8128 2K x8 SRAM (DIP24)
      2018     - Sony CXD5813 2K x8 SRAM
      TC5565   - Toshiba TC5565 8K x8 SRAM (DIP28)
      2148     - Fujitsu MBM2148 1K x4 SRAM (DIP18)
      315-5144 - Signetics CK2605 stamped '315-5144' (DIP20)
      315-5143 - Signetics CK2605 stamped '315-5143' (DIP20)
      315-5106 - PAL16R6 stamped '315-5106' (DIP20)
      315-5107 - PAL16R6 stamped '315-5107' (DIP20)
      315-5108 - PAL16R6 stamped '315-5108' (DIP20)
      315-5011 - Custom Sega IC (DIP40)
      315-5012 - Custom Sega IC (DIP48)
      315-5049 - Custom Sega IC (SDIP64)

               |---------- 7751 Sound Data ---------|  |--------------------------------- Sprites ----------------------------------|

Game           IC1       IC2       IC4       IC5       IC10      IC11      IC17      IC18      IC23      IC24      IC29      IC30
-------------------------------------------------------------------------------------------------------------------------------------
Action Fighter -         -         -         -         EPR10285  EPR10289  EPR10286  EPR10290  EPR10287  EPR10291  EPR10288  EPR10292
Alex Kid       EPR10435  EPR10436  -         -         EPR10437  EPR10441  EPR10438  EPR10442  EPR10439  EPR10443  EPR10440  EPR10444
Fantasy Zone   -         -         -         -         EPR7392   EPR7396   EPR7393   EPR7397   EPR7394   EPR7398   -         -
SDI            -         -         -         -         EPR10760  EPR10763  EPR10761  EPR10764  EPR10762  EPR10765  -         -
Shinobi        EPR11268  -         -         -         EPR11290  EPR11294  EPR11291  EPR11295  EPR11292  EPR11296  EPR11293  EPR11297
Tetris         -         -         -         -         EPR12169  EPR12170  -         -         -         -         -         -

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