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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.
Lethal Crash Race (Video System Co., 1993)
Memory Area:crshrace_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM
0x300000-0x3FFFFF1048576ROM, Regionuser1, 0
0x400000-0x4FFFFF1048576ROM, Region, Mirroruser2, 0, 0x100000
0xA00000-0xA0FFFF65536RAM, Sharedspriteram2
0xD00000-0xD01FFF8192RAM Write, Sharedcrshrace_videoram1_w, videoram1
0xE00000-0xE01FFF8192RAM, Sharedspriteram
0xFE0000-0xFEFFFF65536RAM
0xFFC000-0xFFC0012Writecrshrace_roz_bank_w
0xFFD000-0xFFDFFF4096RAM Write, Sharedcrshrace_videoram2_w, videoram2
0xFFE000-0xFFEFFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
0xFFF000-0xFFF0012Read Port, WriteP1, crshrace_gfxctrl_w
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080UnknownActive Low
0x0100Coin 1Active Low
0x0200Coin 2Active Low
0x0400Coin 3Active Low
0x0800Start 1Active Low
0x1000Start 2Active Low
0x2000Service 2Active Low
0x4000TiltActive Low
0x8000Service 1Active Low
0xFFF002-0xFFF0032Read PortP2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080UnknownActive Low
0xFFF004-0xFFF0052Read PortDSW0
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0002Demo_SoundsActive High
0x0000OffActive High
0x0002OnActive High
0x0004Free_PlayActive High
0x0004OffActive High
0x0000OnActive High
0x00c0DifficultyActive High
0x0080EasyActive High
0x00c0NormalActive High
0x0040HardActive High
0x0000HardestActive High
0x0100SameActive High
0x0000IndividualActive High
0x0e00Coin_AActive High
0x0a003C_1CActive High
0x0c002C_1CActive High
0x0e001C_1CActive High
0x08001C_2CActive High
0x06001C_3CActive High
0x04001C_4CActive High
0x02001C_5CActive High
0x00001C_6CActive High
0x7000Coin_BActive High
0x50003C_1CActive High
0x60002C_1CActive High
0x70001C_1CActive High
0x40001C_2CActive High
0x30001C_3CActive High
0x20001C_4CActive High
0x10001C_5CActive High
0x00001C_6CActive High
0x0e00CoinageActive High
0x0a003C_1CActive High
0x0c002C_1CActive High
0x0e001C_1CActive High
0x08001C_2CActive High
0x06001C_3CActive High
0x04001C_4CActive High
0x02001C_5CActive High
0x00001C_6CActive High
0x8000OffActive High
0x0000OnActive High
0xFFF006-0xFFF0072Read PortDSW2
0x0100WorldActive High
0x0800USA & CanadaActive High
0x0000JapanActive High
0x0200KoreaActive High
0x0400Hong Kong & TaiwanActive High
0x03005Active High
0x05005Active High
0x06005Active High
0x07005Active High
0x09005Active High
0x0a005Active High
0x0b005Active High
0x0c005Active High
0x0d005Active High
0x0e005Active High
0x0f005Active High
0x8000SpecialActive High
0xFFF008-0xFFF0092Writesound_command_w
0xFFF00A-0xFFF00B2Read PortDSW1
0x00012Active High
0x00003Active High
0x000a3C_1CActive High
0x000c2C_1CActive High
0x000e1C_1CActive High
0x00081C_2CActive High
0x00061C_3CActive High
0x00041C_4CActive High
0x00021C_5CActive High
0x00001C_6CActive High
0x0000NoActive High
0x0080YesActive High
0xFFF00E-0xFFF00F2Read PortP3
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Start 3Active Low
0xFFF020-0xFFF03F32Device Writek053936, k053936_device, ctrl_w
0xFFF044-0xFFF0474Write Only(// ??? moves during race)
Memory Area:sound_io_map
Address RangeLengthFunctionDescription
0x00001Writecrshrace_sh_bankswitch_w
0x00041Device Read, Writesoundlatch, generic_latch_8_device, read, pending_command_clear_w
0x0008-0x000B4Device Read/Writeymsnd, ym2610_device, read, write
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x77FF30720ROM
0x7800-0x7FFF2048RAM
0x8000-0xFFFF32768ROM Bankbank1
 

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
0x0000-0x1FFFF1310722CRC(e70a900f) (Fluke: 2D7D)
0x0000-0x1FFFF1310722CRC(e70a900f) (Fluke: 2D7D)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576h895CRC(36ad93c3) (Fluke: DE5C)
0x0000-0xFFFFF1048576h895CRC(36ad93c3) (Fluke: DE5C)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576w18CRC(b15df90d) (Fluke: 3E8B)
0x0000-0xFFFFF1048576w18CRC(b15df90d) (Fluke: 3E8B)
0x100000-0x1FFFFF1048576w19CRC(28326b93) (Fluke: 9236)
0x100000-0x1FFFFF1048576w19CRC(28326b93) (Fluke: 9236)
0x200000-0x2FFFFF1048576w20CRC(d4056ad1) (Fluke: AC3D)
0x200000-0x2FFFFF1048576w20CRC(d4056ad1) (Fluke: AC3D)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152h897CRC(e3230128) (Fluke: CB62)
0x0000-0x1FFFFF2097152h897CRC(e3230128) (Fluke: CB62)
0x200000-0x3FFFFF2097152h896CRC(fff60233) (Fluke: 1375)
0x200000-0x3FFFFF2097152h896CRC(fff60233) (Fluke: 1375)
Memory Area:ymsnd
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576h893CRC(32513b63) (Fluke: 9CD8)
0x0000-0xFFFFF1048576h893CRC(32513b63) (Fluke: 9CD8)
Memory Area:ymsnd.deltat
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576h894CRC(d53300c1) (Fluke: D1B0)
0x0000-0xFFFFF1048576h894CRC(d53300c1) (Fluke: D1B0)
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