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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 (Technos Japan, 1987)
Memory Area:ddragon_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM, Sharedrambase
0x1000-0x11FF512RAM Device Write, Sharedpalette, palette_device, write, palette
0x1200-0x13FF512RAM Device Write, Sharedpalette, palette_device, write_ext, palette_ext
0x1800-0x1FFF2048RAM Write, Sharedddragon_fgvideoram_w, fgvideoram
0x2000-0x21FF512Read/Write, Shared, Mirrorddragon_comram_r, ddragon_comram_w, comram, 0x0600
0x2800-0x2FFF2048RAM, Sharedspriteram
0x3000-0x37FF2048RAM Write, Sharedddragon_bgvideoram_w, bgvideoram
0x38001Read PortP1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Start 1Active Low
0x0080Start 2Active Low
0x38011Read PortP2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Coin 1Active Low
0x0080Coin 2Active Low
0x38021Read PortEXTRA
0x0001Service 1Active Low
0x0002Button 3Active Low
0x0004Button 3Active Low
0x0008CustomActive High
0x0010SpecialActive Low
0x00e0UnusedActive High
0x38031Read PortDSW0
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
0x0040UprightActive High
0x0000CocktailActive High
0x0080Flip_ScreenActive High
0x0080OffActive High
0x0000OnActive High
0x38041Read PortDSW1
0x0003DifficultyActive High
0x0001EasyActive High
0x0003MediumActive High
0x0002HardActive High
0x0000HardestActive High
0x0004Demo_SoundsActive High
0x0000OffActive High
0x0004OnActive High
0x0030Bonus_LifeActive High
0x001020kActive High
0x000040kActive High
0x003030k and every 60kActive High
0x002040k and every 80kActive High
0x00c0LivesActive High
0x00c02Active High
0x00803Active High
0x00404Active High
0x0000Infinite (Cheat)Active High
0x38081Writeddragon_bankswitch_w
0x38091Write Only, Sharedscrollx_lo
0x380A1Write Only, Sharedscrolly_lo
0x380B-0x380F5Read/Writeddragon_interrupt_r, ddragon_interrupt_w
0x4000-0x7FFF16384ROM Bankbank1
0x8000-0xFFFF32768ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096RAM
0x10001Readsoundlatch_ack_r
0x18001Readdd_adpcm_status_r
0x2800-0x28012Device Read/Writefmsnd, ym2151_device, read, write
0x3800-0x38078Writedd_adpcm_w
0x8000-0xFFFF32768ROM
Memory Area:sub_map
Address RangeLengthFunctionDescription
0x0000-0x001F32Read/Writeddragon_hd63701_internal_registers_r, ddragon_hd63701_internal_registers_w
0x001F-0x0FFF4065RAM
0x8000-0x81FF512RAM, Sharedcomram
0xC000-0xFFFF16384ROM
 

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:adpcm
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF6553621j-6CRC(34755de3)
0x10000-0x1FFFF6553621j-7CRC(904de6f8)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF3276821j-5CRC(7a8b8db4),chars
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF6553621j-aCRC(574face3),sprites
0x10000-0x1FFFF6553621j-bCRC(40507a76)
0x20000-0x2FFFF6553621j-cCRC(bb0bc76f)
0x30000-0x3FFFF6553621j-dCRC(cb4f231b)
0x40000-0x4FFFF6553621j-eCRC(a0a0c261)
0x50000-0x5FFFF6553621j-fCRC(6ba152f6)
0x60000-0x6FFFF6553621j-gCRC(3220a0b6)
0x70000-0x7FFFF6553621j-hCRC(65c7517d)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF6553621j-8CRC(7c435887),tiles
0x10000-0x1FFFF6553621j-9CRC(c6640aed)
0x20000-0x2FFFF6553621j-iCRC(5effb0a0)
0x30000-0x3FFFF6553621j-jCRC(5fb42e7c)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF3276821j-1-5.26CRC(42045dfd)
0x10000-0x17FFF3276821j-2-3.25CRC(5779705e),banked at 0x4000-0x8000
0x18000-0x1FFFF3276821j-3.24CRC(3bdea613),banked at 0x4000-0x8000
0x20000-0x27FFF3276821j-4-1.23CRC(728f87b9),banked at 0x4000-0x8000
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF25621j-k-0CRC(fdb130a9),unknown
0x0100-0x02FF51221j-l-0CRC(46339529),Layer priority
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF3276821j-0-1CRC(9efa95bb)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0xC000-0xFFFF1638421jm-0.ic55CRC(f5232d03),63701Y0P MCU
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