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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.
Thunder Dragon (bootleg, 1991)
Memory Area:tdragonb_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x44022-0x440232Readtdragonb_prot_r
0xB0000-0xBFFFF65536RAM, Sharedmainram
0xC0000-0xC00012Read PortIN0
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xC0002-0xC00032Read PortIN1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick DownActive Low
0x0008Joystick UpActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x0100Joystick RightActive Low
0x0200Joystick LeftActive Low
0x0400Joystick DownActive Low
0x0800Joystick UpActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000UnknownActive Low
0x8000UnknownActive Low
0xC0008-0xC00092Read PortDSW1
0x0003LivesActive High
0x00001Active High
0x00022Active High
0x00033Active High
0x00014Active High
0x0004UnusedActive High
0x0004OffActive High
0x0000OnActive High
0x0008UnusedActive High
0x0008OffActive High
0x0000OnActive High
0x0030DifficultyActive High
0x0020EasyActive High
0x0030NormalActive High
0x0010HardActive High
0x0000HardestActive High
0x0040UnusedActive High
0x0040OffActive High
0x0000OnActive High
0x0080Flip_ScreenActive High
0x0080OffActive High
0x0000OnActive High
0xC000A-0xC000B2Read PortDSW2
0x0007Coin_AActive High
0x00044C_1CActive High
0x00053C_1CActive High
0x00062C_1CActive High
0x00071C_1CActive High
0x00031C_2CActive High
0x00021C_3CActive High
0x00011C_4CActive High
0x0000Free_PlayActive High
0x0038Coin_BActive High
0x00204C_1CActive High
0x00283C_1CActive High
0x00302C_1CActive High
0x00381C_1CActive High
0x00181C_2CActive High
0x00101C_3CActive High
0x00081C_4CActive High
0x0000Free_PlayActive High
0x0040Demo_SoundsActive High
0x0000OffActive High
0x0040OnActive High
0x0080UnusedActive High
0x0080OffActive High
0x0000OnActive High
0xC0014-0xC00152Writenmk_flipscreen_w (/* Maybe */)
0xC0018-0xC00192Writenmk_tilebank_w (/* Tile Bank ? */)
0xC001E-0xC001F2Device Writeseibu_sound, seibu_sound_device, main_mustb_w
0xC4000-0xC40078RAM Writenmk_scroll_w
0xC8000-0xC87FF2048RAM Device Write, Sharedpalette, palette_device, write, palette
0xCC000-0xCFFFF16384RAM Write, Sharednmk_bgvideoram0_w, nmk_bgvideoram0
0xD0000-0xD07FF2048RAM Write, Sharednmk_txvideoram_w, nmk_txvideoram
 

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:audiocpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768td_02.binCRC(99ee7505) (Fluke: E617)
Memory Area:bgtile
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288td_06.binCRC(c1be8a4d),16x16 tiles (Fluke: 7D00)
0x80000-0xFFFFF524288td_07.binCRC(2c3e371f),16x16 tiles (Fluke: 8702)
Memory Area:fgtile
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072td_08.binCRC(5144dc69),8x8 tiles (Fluke: 9F05)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536td_01.binCRC(f6f6c4bf) (Fluke: 3C7D)
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