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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.
DownTown / Mokugeki (Seta, 1989)
Memory Area:downtown_map
Address RangeLengthFunctionDescription
0x0000-0x9FFFF655360ROM(// ROM)
0x100000-0x103FFF16384Device Read/Writex1snd, x1_010_device, word_r, word_w (// Sound)
0x200000-0x2000012Read/Write NOP(// watchdog? (twineagl))
0x300000-0x3000012Write NOP(// IRQ enable/acknowledge?)
0x400000-0x4000078Writetwineagl_tilebank_w (// special tile banking to animate water in twineagl)
0x500000-0x5000012Write NOP(// ?)
0x600000-0x6000034Readseta_dsw_r (// DSW)
0x700000-0x7003FF1024RAM, Sharedpaletteram (// Palette)
0x800000-0x8000056Write Only, Sharedvctrl_0 (// VRAM Ctrl)
0x900000-0x903FFF16384RAM Write, Sharedseta_vram_0_w, vram_0 (// VRAM)
0xA00000-0xA000078Writesub_ctrl_w (// Sub CPU Control?)
0xB00000-0xB00FFF4096Read/Writesharedram_68000_r,sharedram_68000_w (// Shared RAM)
0xC00000-0xC000012Write NOP(// ? $4000)
0xD00000-0xD005FF1536RAM, Device Read/Writespritegen, seta001_device, spriteylow_r16, spriteylow_w16 (// Sprites Y)
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)
0xF00000-0xFFFFFF1048576RAM(// RAM)
Memory Area:downtown_sub_map
Address RangeLengthFunctionDescription
0x0000-0x01FF512RAM(// RAM)
0x08001Device Readsoundlatch, generic_latch_8_device, read (//)
0x08011Device Readsoundlatch2, generic_latch_8_device, read (//)
0x10001Writesub_bankswitch_lockout_w (// ROM Bank + Coin Lockout)
0x1000-0x10078Readdowntown_ip_r (// Input Ports)
0x5000-0x57FF2048RAM, Sharedsharedram (// Shared RAM)
0x7000-0x7FFF4096ROM(// ROM)
0x8000-0xBFFF16384ROM Bankbank1 (// Banked ROM)
0xC000-0xFFFF16384ROM(// ROM)
 

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
0x0000-0x7FFFF524288ud2-001-009-t05.8nCRC(aee6c581),32 pin MASK rom (Fluke: EA65)
0x0000-0x7FFFF524288ud2-001-009-t05.8nCRC(aee6c581),32 pin MASK rom (Fluke: EA65)
0x0000-0x7FFFF524288ud2-001-009-t05.8nCRC(aee6c581),32 pin MASK rom (Fluke: EA65)
0x0000-0x7FFFF524288ud2-001-009-t05.8nCRC(aee6c581),32 pin MASK rom (Fluke: EA65)
0x80000-0xFFFFF524288ud2-001-010-t06.9nCRC(3d399d54),32 pin MASK rom (Fluke: 2A0C)
0x80000-0xFFFFF524288ud2-001-010-t06.9nCRC(3d399d54),32 pin MASK rom (Fluke: 2A0C)
0x80000-0xFFFFF524288ud2-001-010-t06.9nCRC(3d399d54),32 pin MASK rom (Fluke: 2A0C)
0x80000-0xFFFFF524288ud2-001-010-t06.9nCRC(3d399d54),32 pin MASK rom (Fluke: 2A0C)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x4000-0x43FFF262144ud2-002-004.17cCRC(bbd538b1),40 pin MASK rom (Fluke: D42A)
0x4000-0x43FFF262144ud2-002-004.17cCRC(bbd538b1),40 pin MASK rom (Fluke: D42A)
0x4000-0x43FFF262144ud2-002-004.17cCRC(bbd538b1),40 pin MASK rom (Fluke: D42A)
0x4000-0x43FFF262144ud2-002-004.17cCRC(bbd538b1),40 pin MASK rom (Fluke: D42A)
Memory Area:x1snd
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288ud2-001-011-t07.14nCRC(9c9ff69f),32 pin MASK rom (Fluke: 3566)
0x0000-0x7FFFF524288ud2-001-011-t07.14nCRC(9c9ff69f),32 pin MASK rom (Fluke: 3566)
0x0000-0x7FFFF524288ud2-001-011-t07.14nCRC(9c9ff69f),32 pin MASK rom (Fluke: 3566)
0x0000-0x7FFFF524288ud2-001-011-t07.14nCRC(9c9ff69f),32 pin MASK rom (Fluke: 3566)
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