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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.
Big Run (Jaleco, 1989)
Memory Area:bigrun_map
Address RangeLengthFunctionDescription
0x0000-0x7FFFF524288ROM(// ROM)
0x80000-0x800012Read Port, WriteIN1, leds_out_w (// Coins)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0010Start 1Active Low
0x0020Start 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x80002-0x800032Read Port, WriteIN2, unknown_out_w (// Buttons)
0x0001P1 BrakeActive Low
0x0002P1 Gear ShiftActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080P1 HornActive Low
0x80004-0x800052Read Port, WriteIN3, motor_out_w (// Motor Limit Switches)
0x0001OffActive High
0x0000OnActive High
0x0002OffActive High
0x0000OnActive High
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x80006-0x800072Read Port, WriteIN4, wheel_out_w (// DSW 1 & 2)
0x0003UnusedActive High
0x00011C_5CActive High
0x00021C_6CActive High
0x00001C_7CActive High
0x0001UnusedActive High
0x0002UnusedActive High
0x0000UnusedActive High
0x0004Allow_ContinueActive High
0x0004NoActive High
0x0000YesActive High
0x0008RegionActive High
0x0008JapaneseActive High
0x0000EnglishActive High
0x0000NoActive High
0x0010YesActive High
0x0060DifficultyActive High
0x0000EasyActive High
0x0060NormalActive High
0x0020HardActive High
0x0040HardestActive High
0x0000NoActive High
0x0080After 15 SecondsActive High
0x0100OffActive High
0x0000OnActive High
0x0200Demo_SoundsActive High
0x0000OffActive High
0x0200OnActive High
0x1c00Coin_BActive High
0x10004C_1CActive High
0x08003C_1CActive High
0x18002C_1CActive High
0x1c001C_1CActive High
0x0c001C_2CActive High
0x14001C_3CActive High
0x04001C_4CActive High
0x0000Free_PlayActive High
0x1c00UnusedActive High
0x0000Free_PlayActive High
0xe000Coin_AActive High
0x80004C_1CActive High
0x40003C_1CActive High
0xc0002C_1CActive High
0xe0001C_1CActive High
0x60001C_2CActive High
0xa0001C_3CActive High
0x20001C_4CActive High
0x0000Free_PlayActive High
0x80008-0x800092Device Readsoundlatch2, generic_latch_16_device, read (// From sound cpu)
0x8000A-0x8000B2Device Writesoundlatch, generic_latch_16_device, write (// To sound cpu)
0x8000C-0x8000D2Write NOP(// ??)
0x80010-0x800112Read/Writebigrun_ip_select_r, ip_select_w
0x80012-0x800132Writeip_select_plus1_w
0x82000-0x820056Device Read/Writescroll0, megasys1_tilemap_device, scroll_r, scroll_w
0x82008-0x8200D6Device Read/Writescroll1, megasys1_tilemap_device, scroll_r, scroll_w
0x82100-0x821056Device Read/Writescroll2, megasys1_tilemap_device, scroll_r, scroll_w
0x82108-0x821092Read/Write NOP(// ? written with 0 only)
0x82200-0x822012Read PortIN5 (// DSW 3 (4 bits))
0x0000Master UnitActive High
0x0001Other UnitsActive High
0x00001 (Blue-White Car)Active High
0x00022 (Green-White Car)Active High
0x00043 (Red-White Car)Active High
0x00064 (Yellow Car)Active High
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x82208-0x822092Read/Write NOP(// watchdog reset)
0x82308-0x823092Writecischeat_comms_w
0x82400-0x824012Writeactive_layers_w
0x84000-0x847FF2048RAM(// Linking with other units)
0x88000-0x8BFFF16384RAM, Sharedshare2 (// Sharedram with sub CPU#2)
0x8C000-0x8FFFF16384RAM, Sharedshare1 (// Sharedram with sub CPU#1)
0x90000-0x93FFF16384RAM Device Write, Sharedscroll0, megasys1_tilemap_device, write, scroll0 (// Scroll ram 0)
0x94000-0x97FFF16384RAM Device Write, Sharedscroll1, megasys1_tilemap_device, write, scroll1 (// Scroll ram 1)
0x98000-0x9BFFF16384RAM Device Write, Sharedscroll2, megasys1_tilemap_device, write, scroll2 (// Scroll ram 2)
0x9C000-0x9FFFF16384RAM Device Write, Sharedpalette, palette_device, write, palette (// Palettes)
0xF0000-0xFFFFF65536RAM, Sharedram (// RAM)
0x100000-0x13FFFF262144ROM, Regionuser1,0 (// ROM)
Memory Area:bigrun_map2
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM(// ROM)
0x40000-0x47FFF32768RAM, Sharedshare1 (// Shared RAM (with Main CPU))
0x80000-0x807FF2048RAM, Sharedroadram.0 (// Road RAM)
0xC0000-0xC3FFF16384RAM(// RAM)
Memory Area:bigrun_map3
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM(// ROM)
0x40000-0x47FFF32768RAM, Sharedshare2 (// Shared RAM (with Main CPU))
0x80000-0x807FF2048RAM, Sharedroadram.1 (// Road RAM)
0xC0000-0xC3FFF16384RAM(// RAM)
Memory Area:bigrun_sound_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM(// ROM)
0x40000-0x400012Device Read, Writesoundlatch, generic_latch_16_device, read, bigrun_soundbank_w (// From Main CPU)
0x60000-0x600012Device Writesoundlatch2, generic_latch_16_device, write (// To Main CPU)
0x80000-0x800034Device Read/Write 8-bitymsnd, ym2151_device, read, write, 0x00ff
0xA0000-0xA00034Device Read/Write 8-bitoki1, okim6295_device, read, write, 0x00ff
0xC0000-0xC00034Device Read/Write 8-bitoki2, okim6295_device, read, write, 0x00ff
0xF0000-0xFFFFF65536RAM(// RAM)
 

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:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072mb88004l.t50CRC(6b11fb10) (Fluke: F98E)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072mb88004m.t51CRC(ee52f04d) (Fluke: 1232)
Memory Area:road0
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mr88004g.t45CRC(bb397bae) (Fluke: A937)
0x0000-0x7FFFF524288mr88004g.t45CRC(bb397bae) (Fluke: A937)
0x80000-0xFFFFF524288mb88004h.t46CRC(6b31a1ba) (Fluke: 4771)
0x80000-0xFFFFF524288mb88004h.t46CRC(6b31a1ba) (Fluke: 4771)
Memory Area:road1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288mr88004g.t45CRC(bb397bae) (Fluke: A937)
0x0000-0x7FFFF524288mr88004g.t45CRC(bb397bae) (Fluke: A937)
0x80000-0xFFFFF524288mb88004h.t46CRC(6b31a1ba) (Fluke: 4771)
0x80000-0xFFFFF524288mb88004h.t46CRC(6b31a1ba) (Fluke: 4771)
Memory Area:scroll0
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072br8950b.5CRC(0530764e) (Fluke: F726)
0x20000-0x3FFFF131072br8950b.6CRC(cf40ecfa) (Fluke: C79F)
Memory Area:scroll1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072br8950b.7CRC(bd5fd061) (Fluke: C5B2)
0x20000-0x3FFFF131072br8950b.8CRC(7d66f418) (Fluke: 53D0)
Memory Area:scroll2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072br8950b.9CRC(be0864c4) (Fluke: 3032)
Memory Area:user2
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536br8951b.23CRC(b9474fec) (Fluke: ECFF)
0x0000-0x1FFFF131072br8951b.22CRC(c112a803) (Fluke: D427)
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