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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.
Road Riot 4WD (Atari Games, 1991)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x80001524290ROM
0xE00000-0xE000012Read PortIN0
0x00ffUnusedActive Low
0x0100Start 1Active Low
0x0200Button 3Active Low
0x0400Button 2Active Low
0xf800UnusedActive Low
0xE00002-0xE000032Read PortIN1
0xffffUnusedActive Low
0xE00010-0xE000112Readspecial_port2_r
0xE00012-0xE000132Read Portjsa:JSAIII
0xE00020-0xE000278Read/Writea2d_data_r, a2d_select_w
0xE00030-0xE000312Device Read 8-bitjsa, atari_jsa_iii_device, main_response_r, 0x00ff
0xE00040-0xE000412Device Write 8-bitjsa, atari_jsa_iii_device, main_command_w, 0x00ff
0xE00050-0xE000512Writeio_latch_w
0xE00060-0xE000612Device Writeeeprom, atari_eeprom_device, unlock_write
0xE03000-0xE030012Writevideo_int_ack_w
0xE03800-0xE038012Device Writewatchdog, watchdog_timer_device, reset16_w
0xE80000-0xE80FFF4096RAM
0xF40000-0xF400012Device Readasic65, asic65_device, io_r
0xF60000-0xF600012Device Readasic65, asic65_device, read
0xF80000-0xF800034Device Writeasic65, asic65_device, data_w
0xFA0000-0xFA0FFF4096Device Read/Write 8-biteeprom, atari_eeprom_device, read, write, 0x00ff
0xFC0000-0xFC0FFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
0xFF0000-0xFFFFFF65536RAM
0xFF0000-0xFF0FFF4096RAM, Sharedrle
0xFF2000-0xFF5FFF16384Device Write, Sharedplayfield, tilemap_device, write, playfield
0xFF6000-0xFF6FFF4096Device Write, Sharedalpha, tilemap_device, write, alpha
0xFF7000-0xFF70012Write, Sharedmo_command_w, mo_command
 

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:asic65:asic65cpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0A7F2688136089-1012.3fCRC(7c5498e7) (Fluke: 177F)
0x0000-0x0A7F2688136089-1012.3fCRC(7c5498e7) (Fluke: 177F)
0x0000-0x0A7F2688136089-1012.3fCRC(7c5498e7) (Fluke: 177F)
Memory Area:eeprom:eeprom
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048roadriot-eeprom.5cCRC(8d9b957d)
0x0000-0x07FF2048roadriot-eeprom.5cCRC(8d9b957d)
0x0000-0x07FF2048roadriot-eeprom.5cCRC(8d9b957d)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x20000-0x3FFFF131072136089-1038.22cCRC(90f3c6ee) (Fluke: 3789)
0x20000-0x3FFFF131072136089-1038.22cCRC(90f3c6ee) (Fluke: 3789)
0x20000-0x3FFFF131072136089-1038.22cCRC(90f3c6ee) (Fluke: 3789)
0x60000-0x7FFFF131072136089-1039.2021cCRC(a7e836b1) (Fluke: AF4B)
0x60000-0x7FFFF131072136089-1039.2021cCRC(a7e836b1) (Fluke: AF4B)
0x60000-0x7FFFF131072136089-1039.2021cCRC(a7e836b1) (Fluke: AF4B)
0xA0000-0xBFFFF131072136089-1042.20cCRC(b8a6d15a) (Fluke: 4694)
0xA0000-0xBFFFF131072136089-1042.20cCRC(b8a6d15a) (Fluke: 4694)
0xA0000-0xBFFFF131072136089-1042.20cCRC(b8a6d15a) (Fluke: 4694)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072136089-1046.22jCRC(0005bab0),alphanumerics (Fluke: D165)
0x0000-0x1FFFF131072136089-1046.22jCRC(0005bab0),alphanumerics (Fluke: D165)
0x0000-0x1FFFF131072136089-1046.22jCRC(0005bab0),alphanumerics (Fluke: D165)
Memory Area:jsa:cpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536136089-1047.12cCRC(849dd26c) (Fluke: 871D)
0x0000-0xFFFF65536136089-1047.12cCRC(849dd26c) (Fluke: 871D)
0x0000-0xFFFF65536136089-1047.12cCRC(849dd26c) (Fluke: 871D)
Memory Area:jsa:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072136089-1048.19eCRC(2db638a7) (Fluke: F8C7)
0x0000-0x1FFFF131072136089-1048.19eCRC(2db638a7) (Fluke: F8C7)
0x0000-0x1FFFF131072136089-1048.19eCRC(2db638a7) (Fluke: F8C7)
0x20000-0x3FFFF131072136089-1049.17eCRC(e1dd7f9e) (Fluke: CF7A)
0x20000-0x3FFFF131072136089-1049.17eCRC(e1dd7f9e) (Fluke: CF7A)
0x20000-0x3FFFF131072136089-1049.17eCRC(e1dd7f9e) (Fluke: CF7A)
0x40000-0x5FFFF131072136089-1050.15eCRC(64d410bb) (Fluke: B6C1)
0x40000-0x5FFFF131072136089-1050.15eCRC(64d410bb) (Fluke: B6C1)
0x40000-0x5FFFF131072136089-1050.15eCRC(64d410bb) (Fluke: B6C1)
0x60000-0x7FFFF131072136089-1051.12eCRC(bffd01c8) (Fluke: 1D2C)
0x60000-0x7FFFF131072136089-1051.12eCRC(bffd01c8) (Fluke: 1D2C)
0x60000-0x7FFFF131072136089-1051.12eCRC(bffd01c8) (Fluke: 1D2C)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x01FF512136089-1001.20pCRC(5836cb5a) (Fluke: 2499)
0x0000-0x01FF512136089-1001.20pCRC(5836cb5a) (Fluke: 2499)
0x0000-0x01FF512136089-1001.20pCRC(5836cb5a) (Fluke: 2499)
0x0200-0x03FF512136089-1002.22pCRC(44288753) (Fluke: 6822)
0x0200-0x03FF512136089-1002.22pCRC(44288753) (Fluke: 6822)
0x0200-0x03FF512136089-1002.22pCRC(44288753) (Fluke: 6822)
0x0400-0x05FF512136089-1003.21pCRC(1f571706) (Fluke: 7D26)
0x0400-0x05FF512136089-1003.21pCRC(1f571706) (Fluke: 7D26)
0x0400-0x05FF512136089-1003.21pCRC(1f571706) (Fluke: 7D26)
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