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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.
Dragon Unit / Castle of Dragon (Seta, 1989)
Memory Area:drgnunit_map
Address RangeLengthFunctionDescription
0x0000-0xBFFFF786432ROM(// ROM)
0x100000-0x103FFF16384Device Read/Writex1snd, x1_010_device, word_r, word_w (// Sound)
0x200000-0x2000012Write NOP(// Watchdog)
0x300000-0x3000012Write NOP(// ? IRQ Ack)
0x500000-0x5000012RAM Write, Sharedseta_vregs_w, vregs (// Coin Lockout + Video Registers)
0x600000-0x6000034Readseta_dsw_r (// DSW)
0x700000-0x7003FF1024RAM, Sharedpaletteram (// Palette)
0x800000-0x8000056RAM, Sharedvctrl_0 (// VRAM Ctrl)
0x900000-0x903FFF16384RAM Write, Sharedseta_vram_0_w, vram_0 (// VRAM)
0x904000-0x90FFFF49152Write NOP(// unused (qzkklogy))
0xB00000-0xB000012Read PortP1 (// P1)
0xB00002-0xB000032Read PortP2 (// P2)
0xB00004-0xB000052Read PortCOINS (// Coins)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008TiltActive Low
0x0010Coin Mode 1Active High
0x0000Coin Mode 2Active High
0x0020Dragon UnitActive High
0x0000Castle of DragonActive High
0x00c0Athena (Japan)Active High
0x0080Athena / Taito (Japan)Active High
0x0040Seta USA / Taito AmericaActive High
0x0000Seta USA / RomstarActive High
0xB00006-0xB000072Read NOP(// unused (qzkklogy))
0xD00600-0xD006078RAM, Device Read/Writespritegen, seta001_device, spritectrl_r16, spritectrl_w16
0xE00000-0xE03FFF16384RAM, Device Read/Writespritegen, seta001_device, spritecode_r16, spritecode_w16 (// Sprites Code + X + Attr)
0xF00000-0xF0FFFF65536RAM(// RAM (qzkklogy))
0xFFC000-0xFFFFFF16384RAM(// RAM (drgnunit,stg))
 

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:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072scr-1o.binCRC(671525db) (Fluke: 5BE1)
0x20000-0x3FFFF131072scr-2o.binCRC(2a3f2ed8) (Fluke: C6EE)
0x40000-0x5FFFF131072scr-3o.binCRC(4d33a92d) (Fluke: A871)
0x60000-0x7FFFF131072scr-4o.binCRC(79a0aa61) (Fluke: F33C)
0x80000-0x9FFFF131072scr-1e.binCRC(dc9cd8c9) (Fluke: 68DE)
0xA0000-0xBFFFF131072scr-2e.binCRC(b6126b41) (Fluke: 82DC)
0xC0000-0xDFFFF131072scr-3e.binCRC(1592b8c2) (Fluke: 4ADD)
0xE0000-0xFFFFF131072scr-4e.binCRC(8201681c) (Fluke: 5750)
Memory Area:x1snd
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072snd-1.binCRC(8f47bd0d) (Fluke: 9C05)
0x20000-0x3FFFF131072snd-2.binCRC(65c40ef5) (Fluke: 775A)
0x40000-0x5FFFF131072snd-3.binCRC(71fbd54e) (Fluke: 498C)
0x60000-0x7FFFF131072snd-4.binCRC(ac50133f) (Fluke: C4AE)
0x80000-0x9FFFF131072snd-5.binCRC(70652f2c) (Fluke: 9B25)
0xA0000-0xBFFFF131072snd-6.binCRC(10a1039d) (Fluke: 340C)
0xC0000-0xDFFFF131072snd-7.binCRC(decbc8b0) (Fluke: 9CEE)
0xE0000-0xFFFFF131072snd-8.binCRC(3ac51bee) (Fluke: E100)
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