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Memory Map

The following is a memory map that was generated based on the MAME source code (.180).  This information is only as accurate as the MAME driver is.  If you see any errors, please let me know what that error is.
 
The Memory Area is related to where the information is from (CPU, Sound Board, etc..), and it may also reflect what it has in common with other hardware.
China Gate (Technos Japan (Taito / Romstar license), 1988)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192RAM, Sharedshare1
0x2000-0x27FF2048RAM Write, Sharedddragon_fgvideoram_w, fgvideoram
0x2800-0x2FFF2048RAM Write, Sharedddragon_bgvideoram_w, bgvideoram
0x3000-0x317F384Device Write, Sharedpalette, palette_device, write, palette
0x3400-0x357F384Device Write, Sharedpalette, palette_device, write_ext, palette_ext
0x3800-0x397F384Write Bank, Sharedbank3, spriteram
0x3E00-0x3E045Writechinagat_interrupt_w
0x3E061Write Only, Sharedscrolly_lo
0x3E071Write Only, Sharedscrollx_lo
0x3F001Read PortSYSTEM
0x0001CustomActive High
0x0002Coin 1Active Low
0x0004Coin 2Active Low
0x0008Coin 3Active Low
0x00f0UnknownActive High
0x3F001Writechinagat_video_ctrl_w
0x3F011Writechinagat_bankswitch_w
0x3F011Read PortDSW1
0x0007Coin_AActive High
0x00004C_1CActive High
0x00013C_1CActive High
0x00022C_1CActive High
0x00071C_1CActive High
0x00061C_2CActive High
0x00051C_3CActive High
0x00041C_4CActive High
0x00031C_5CActive High
0x0038Coin_BActive High
0x00004C_1CActive High
0x00083C_1CActive High
0x00102C_1CActive High
0x00381C_1CActive High
0x00301C_2CActive High
0x00281C_3CActive High
0x00201C_4CActive High
0x00181C_5CActive High
0x0040CabinetActive High
0x0000UprightActive High
0x0040CocktailActive High
0x0040UnknownActive High
0x0080Flip_ScreenActive High
0x0080OffActive High
0x0000OnActive High
0x3F021Read PortDSW2
0x0003DifficultyActive High
0x0001EasyActive High
0x0003NormalActive High
0x0002HardActive High
0x0000HardestActive High
0x0004Demo_SoundsActive High
0x0000OffActive High
0x0004OnActive High
0x0008UnknownActive High
0x000050Active High
0x002055Active High
0x003060Active High
0x001070Active High
0x00c0LivesActive High
0x00001Active High
0x00c02Active High
0x00803Active High
0x00404Active High
0x3F031Read PortP1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 1Active Low
0x3F041Read PortP2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 2Active Low
0x4000-0x7FFF16384ROM Bankbank1
0x8000-0xFFFF32768ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x8800-0x88012Device Read/Writeymsnd, ym2151_device, read, write
0x98001Device Read/Writeoki, okim6295_device, read, write
0xA0001Device Readsoundlatch, generic_latch_8_device, read
Memory Area:sub_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192RAM, Sharedshare1
0x20001Writechinagat_sub_bankswitch_w
0x28001Write Only(/* Called on CPU start and after return from jump table */)
0x4000-0x7FFF16384ROM Bankbank4
0x8000-0xFFFF32768ROM
 

ROM Map for this game

 
This is the ROM map for the game.  This should tell you what address the ROM is at, how big it is, what it's used for.   
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x10000-0x1FFFF65536chinagat_a-12BAD_DUMP CRC(3c864299) (Fluke: 74E6)
0x20000-0x2FFFF65536chinagat_a-15BAD_DUMP CRC(2f268f37) (Fluke: E46C)
0x30000-0x3FFFF65536chinagat_a-14BAD_DUMP CRC(aef814c8) (Fluke: 0F75)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x10000-0x27FFF98304cgate51.binCRC(439a3b19),Banks 0x4000 long @ 0x4000 (Fluke: E3EB)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF13107223j1-0.53CRC(f91f1001) (Fluke: B845)
0x20000-0x3FFFF13107223j2-0.52CRC(8b6f26e9) (Fluke: C760)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF3276823j0-0.40CRC(9ffcadb6) (Fluke: 2664)
0x10000-0x27FFF9830423j4-0.48CRC(2914af38),Banks 0x4000 long @ 0x4000 (Fluke: 1B)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF51223jb-0.16CRC(46339529),82S131 on video board (Fluke: 083F)
0x0200-0x02FF25623j5-0.45CRC(fdb130a9),82S129 on main board (Fluke: 75FB)
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