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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.
American Speedway (Enerdyne Technologies Inc., 1987)
Memory Area:amspdwy_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x801F32Device Write, Sharedpalette, palette_device, write, palette
0x9000-0x93FF1024Mirror, RAM Write, Shared0x0400, amspdwy_videoram_w, videoram
0x9800-0x9BFF1024RAM Write, Sharedamspdwy_colorram_w, colorram
0x9C00-0x9FFF1024RAM(// unused?)
0xA0001Read PortDSW1
0x0000OffActive High
0x0001OnActive High
0x0000OffActive High
0x0002OnActive High
0x0004Demo_SoundsActive High
0x0000OffActive High
0x0004OnActive High
0x0000OffActive High
0x0010OnActive High
0xA4001Read Port, WriteDSW2, amspdwy_flipscreen_w
0x0003CoinageActive High
0x00032C_1CActive High
0x00021C_1CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x000cDifficultyActive High
0x0000EasyActive High
0x0004NormalActive High
0x0008HardActive High
0x000cHardestActive High
0x003020 secActive High
0x002030 secActive High
0x001045 secActive High
0x000060 secActive High
0xA8001Readamspdwy_wheel_0_r
0xAC001Readamspdwy_wheel_1_r
0xB0001Write NOP(// irq ack?)
0xB4001Read/Writeamspdwy_sound_r, amspdwy_sound_w
0xC000-0xC0FF256RAM, Sharedspriteram
0xE000-0xE7FF2048RAM
Memory Area:amspdwy_portmap
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM, Regiontracks, 0
Memory Area:amspdwy_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x90001Device Readsoundlatch, generic_latch_8_device, read
0xA000-0xA0012Device Read/Writeymsnd, ym2151_device, read, write
0xC000-0xDFFF8192RAM
0xFFFF1Read NOP(// ??? IY = FFFF at the start ?)
 

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
0x0000-0x7FFF32768audi9463.u2CRC(61b0467e) (Fluke: 2F6B)
0x0000-0x7FFF32768audi9463.u2CRC(61b0467e) (Fluke: 2F6B)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF4096hilo9b3c.5aCRC(f50f864c) (Fluke: 39EF)
0x0000-0x0FFF4096hilo9b3c.5aCRC(f50f864c) (Fluke: 39EF)
0x1000-0x1FFF4096hihie12a.4aCRC(3d7497f3) (Fluke: D970)
0x1000-0x1FFF4096hihie12a.4aCRC(3d7497f3) (Fluke: D970)
0x2000-0x2FFF4096lolo1d51.1aCRC(58701c1c) (Fluke: 1071)
0x2000-0x2FFF4096lolo1d51.1aCRC(58701c1c) (Fluke: 1071)
0x3000-0x3FFF4096lohi4644.2aCRC(a1d802b1) (Fluke: 6565)
0x3000-0x3FFF4096lohi4644.2aCRC(a1d802b1) (Fluke: 6565)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768game5807.u33CRC(88233b59) (Fluke: 7892)
Memory Area:tracks
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768trks6092.u34CRC(74a4e7b7) (Fluke: E940)
0x0000-0x7FFF32768trks6092.u34CRC(74a4e7b7) (Fluke: E940)
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