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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.
Double Dragon 3 - The Rosetta Stone (Technos Japan, 1990)
Memory Area:ddragon3_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x80000-0x80FFF4096RAM Write, Sharedddragon3_fg_videoram_w, fg_videoram (/* Foreground (32x32 Tiles - 4 by per tile) */)
0x82000-0x827FF2048RAM Write, Sharedddragon3_bg_videoram_w, bg_videoram (/* Background (32x32 Tiles - 2 by per tile) */)
0xC0000-0xC000F16Writeddragon3_scroll_w
0x100000-0x10000F16Writeddragon3_io_w
0x100000-0x1000012Read PortP1_P2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 1Active Low
0x0100Joystick RightActive Low
0x0200Joystick LeftActive Low
0x0400Joystick UpActive Low
0x0800Joystick DownActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000Start 2Active Low
0x100002-0x1000032Read PortSYSTEM
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x00f8UnusedActive Low
0xff00UnusedActive Low
0x100004-0x1000052Read PortDSW
0x0003CoinageActive High
0x00003C_1CActive High
0x00012C_1CActive High
0x00031C_1CActive High
0x00021C_2CActive High
0x0010OffActive High
0x0000OnActive High
0x0020Demo_SoundsActive High
0x0000OffActive High
0x0020OnActive High
0x0040Flip_ScreenActive High
0x0040OffActive High
0x0000OnActive High
0x0300DifficultyActive High
0x0200EasyActive High
0x0300NormalActive High
0x0100HardActive High
0x0000HardestActive High
0x0400OffActive High
0x0000OnActive High
0x0000OffActive High
0x200050Active High
0x0000200Active High
0x4000230Active High
0x8000PlayersActive High
0x80002Active High
0x00003Active High
0x100006-0x1000072Read PortP3
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 3Active Low
0xff00UnusedActive Low
0x140000-0x1405FF1536RAM Device Write, Sharedpalette, palette_device, write, palette (/* Palette RAM */)
0x180000-0x180FFF4096RAM, Sharedspriteram
0x1C0000-0x1C3FFF16384RAM(/* working RAM */)
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0xBFFF49152ROM
0xC000-0xC7FF2048RAM
0xC800-0xC8012Device Read/Writeym2151, ym2151_device, read, write
0xD8001Device Read/Writeoki, okim6295_device, read, write
0xE0001Device Readsoundlatch, generic_latch_8_device, read
0xE8001Writeoki_bankswitch_w
 

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
0x0000-0xFFFF6553630a13-0.ic43CRC(1e974d9b) (Fluke: 482B)
0x0000-0xFFFF6553630a13-0.ic43CRC(1e974d9b) (Fluke: 482B)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF52428830j-3.ic9CRC(b3151871) (Fluke: 45DB)
0x0000-0x7FFFF52428830j-3.ic9CRC(b3151871) (Fluke: 45DB)
0x80000-0x8FFFF6553630a12-0.ic8CRC(20d64bea) (Fluke: 837A)
0x100000-0x17FFFF52428830j-2.ic11CRC(41c6fb08) (Fluke: F850)
0x100000-0x17FFFF52428830j-2.ic11CRC(41c6fb08) (Fluke: F850)
0x180000-0x18FFFF6553630a11-0.ic10CRC(785d71b0) (Fluke: 160A)
0x200000-0x27FFFF52428830j-1.ic13CRC(67a6f114) (Fluke: 4FF6)
0x200000-0x27FFFF52428830j-1.ic13CRC(67a6f114) (Fluke: 4FF6)
0x280000-0x28FFFF6553630a10-0.ic12CRC(15e43d12) (Fluke: BAC2)
0x300000-0x37FFFF52428830j-0.ic15CRC(f15dafbe) (Fluke: 4B51)
0x300000-0x37FFFF52428830j-0.ic15CRC(f15dafbe) (Fluke: 4B51)
0x380000-0x38FFFF6553630a9-0.ic14CRC(5a47e7a4) (Fluke: 2B64)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF52428830j-8.ic73CRC(c3ad40f3) (Fluke: B7FA)
0x0000-0x7FFFF52428830j-8.ic73CRC(c3ad40f3) (Fluke: B7FA)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256mb7114h.ic38CRC(113c7443) (Fluke: 7E45)
0x0000-0x00FF256mb7114h.ic38CRC(113c7443) (Fluke: 7E45)
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