[Dec/20/2003]

Landing Gear
Taito, 1995

This is a flight simulator game running on Taito JC System hardware.
The system comprises two boards plugged together back-to-back via five high density connectors.
The top board contains the main CPU, all RAMs, graphics and sound hardware and the bottom
board contains the game ROMs, communication devices and a MC68HC11 MCU. Landing Gear
is a single player game so the board does not contain any communication hardware.
This hardware seems to be the earliest revision of the JC board. This is the only JC game that
had a 28-way edge connector, which is actually almost JAMMA. The power/GND, video and 
most buttons (test/service/coin/start etc) work fine using any standard JAMMA cab. However the
analog controls are wired to another connector on the bottom PCB via an interface board.
When other JC bottom boards are swapped to this top board, they will run fine, but some of the 
graphics are messed up. This is probably due to the different PALs and their changed locations.
This seems to mostly affect the texture mapping (tested with swapping Side By Side 2) as the title
and most of the background graphics are ok but the car textures are just a mess of pixels.


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

Top board: MOTHER PCB  K11X0835A  M43E0304A
|---------------------------------------------------------------------------------|
|                                                                 43256  43256    |
|54MHz                                                            43256           |
|                                                                                 |
|TC514260                                                                         |
|         TCO870HVP  uPD424210                                    TCO640FIO       |
|TC514260 (QFP208)   uPD424210             E07-08.65              (QFP120)        |
|E07-02.4                                                                         |
|                                                                                 |
|TMS320C31  43256                                                                 |
|(QFP132)   43256              MC68040RC25          E07-10.116  93C46.91          |
|labelled          TCO770CMU   (PGA TYPE)                    E07-04.115  TEST_SW  |
|"Taito E07-11"    (QFP208)                         E07-09.82      MB3771         |
|                                                                                 |
|                                                            MB8421-90            |
|TC528257   E07-06.37                                                             |
|                                                                                 |
|TC528257   TC514260                                                              |
|                              E07-07.49    CY7B991                               |
|TC528257   TC514260           E07-03.50                     TC511664             |
|                     TCO780FPA                                                   |
|TC528257   TC514260  (QFP240)           10MHz   MC68EC000   ENSONIC              |
|                                 CY7B991                    ESPR6 ES5510         |
|TC528257   TC514260                                                              |
|                                                                                 |
|TC528257   TC514260              TCO840GLU   TC51832       MC33274   TDA1543     |
|                                 (QFP144)    TC51832                             |
|TC528257   TC514260                             16MHz      MB87078               |
|                     TCO780FPA          30.4761MHz                               |
|TC528257   TC514260  (QFP240)                                                    |
|                                           ENSONIC                               |
|TC528257             E07-05.22             OTISR2                                |
|---------------------------------------------------------------------------------|

Notes:
      All 3K files are PALs type PALCE 16V8 and saved in Jedec format.


Bottom board: JCG DAUGHTER PCB-L K91E0603A
|---------------------------------------------------------------------------------|
|                                                                                 |
|                                                                                 |
|                    E17-21.30  E17-22.31                                         |
|                                                                                 |
|                                                                                 |
|                                                                                 |
|                                                                                 |
|                                                                                 |
|  E17-01.5   E17-07.18   E17-13.32                                               |
|                                                                                 |
|  *          E17-08.19   E17-14.33                                               |
|                                                                                 |
|  *          *           E17-15.34                     E17-23.65                 |
|                                                                                 |
|  E17-02.8   *           E17-16.35                     TC5563                    |
|                                                                                 |
|  E17-03.9   E17-09.22   E17-37.36                        MC68HC11M0             |
|                                                          (QFP80)                |
|  E17-04.10  E17-10.23   E17-38.37                                               |
|                                                                                 |
|  E17-05.11  E17-11.24   E17-39.38                                               |
|                                                          E09-21.69              |
|  E17-06.12  E17-12.25   E17-40.39                                               |
|                                                                                 |
|                                                                                 |
|                                                      E09-22.73                  |
|                                                                                 |
|                                                                                 |
|                                                      E17-32.96                  |
|                                                                                 |
|                                                                                 |
|---------------------------------------------------------------------------------|

Notes:
      All 3K files are PALs type PALCE 16V8 and saved in Jedec format.
      MC68HC11: Surface-mounted QFP80 microcontroller with 64k internal ROM (not read but very likely protected)
      ROMs .36-.39 are 27C4001, main program.
      ROM .65 is 27C512, use unknown, possibly used with 68HC11 MCU.
      ROMs .30-.31 are 27C2001, sound program.
      ROMs .32-.35 are 16M MASK, sound.
      ROMs .5-.25 are 16M MASK, graphics.
      * Unpopulated ROM socket

-
