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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.
Extreme Downhill (Sammy Industries Japan, 1995)
Memory Area:extdwnhl_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM(// ROM)
0x200000-0x20FFFF65536RAM(// RAM)
0x210000-0x21FFFF65536RAM(// RAM)
0x220000-0x23FFFF131072RAM(// RAM (sokonuke))
0x400000-0x4000012Read PortP1 (// P1)
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080Start 1Active Low
0x400002-0x4000032Read PortP2 (// P2)
0x0001Joystick LeftActive Low
0x0002Joystick RightActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080Start 2Active Low
0x400004-0x4000052Read PortCOINS (// Coins)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008ServiceActive Low
0x0030WorldActive High
0x0020WorldActive High
0x0010USAActive High
0x0000JapanActive High
0x0040OffActive High
0x0000OnActive High
0x0080OffActive High
0x0000OnActive High
0x400008-0x40000B4Readseta_dsw_r (// DSW)
0x40000C-0x40000D2Device Read/Writewatchdog, watchdog_timer_device, reset16_r, reset16_w (// Watchdog (extdwnhl (R) & sokonuke (W) MUST RETURN $FFFF))
0x500000-0x5000034RAM Write, Sharedseta_vregs_w, vregs (// Coin Lockout + Video Registers)
0x500004-0x5000074Read/Write NOP(// IRQ Ack (extdwnhl (R) & sokonuke (W)))
0x600400-0x600FFF3072RAM, Sharedpaletteram (// Palette)
0x601000-0x610BFF64512RAM(//)
0x800000-0x803FFF16384RAM Write, Sharedseta_vram_0_w, vram_0 (// VRAM 0&1)
0x804000-0x80FFFF49152RAM(//)
0x880000-0x883FFF16384RAM Write, Sharedseta_vram_2_w, vram_2 (// VRAM 2&3)
0x884000-0x88FFFF49152RAM(//)
0xA00600-0xA006078RAM, Device Read/Writespritegen, seta001_device, spritectrl_r16, spritectrl_w16
0xB00000-0xB03FFF16384RAM, Device Read/Writespritegen, seta001_device, spritecode_r16, spritecode_w16 (// Sprites Code + X + Attr)
0xB04000-0xB13FFF65536RAM(//)
0xE00000-0xE03FFF16384Device Read/Writex1snd, x1_010_device, word_r, word_w (// Sound)
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152fw001003.202CRC(ac9b31d5) (Fluke: A0A1)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152fw001006.152CRC(d00e8ddd) (Fluke: AF83)
Memory Area:x1snd
Address RangeLengthLabel/LocationDescription
0x80000-0xFFFFF524288fw001007.026CRC(16d84d7a) (Fluke: 4DFB)
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