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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.
Taxi Driver (Graphic Techno, 1984)
Memory Area:cpu2_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x6000-0x67FF2048RAM
0x8000-0x87FF2048RAM
0xA000-0xA0034Device Read/Writeppi8255_1, i8255_device, read, write
0xE0001Read PortDSW0
0x000d4C_1CActive High
0x000a3C_1CActive High
0x000e4C_2CActive High
0x00072C_1CActive High
0x000b3C_2CActive High
0x00001C_1CActive High
0x000c3C_4CActive High
0x00082C_3CActive High
0x00011C_2CActive High
0x00092C_5CActive High
0x00021C_3CActive High
0x00031C_4CActive High
0x00041C_5CActive High
0x00051C_6CActive High
0x00061C_7CActive High
0x000fFree_PlayActive High
0x00d04C_1CActive High
0x00a03C_1CActive High
0x00e04C_2CActive High
0x00702C_1CActive High
0x00b03C_2CActive High
0x00001C_1CActive High
0x00c03C_4CActive High
0x00802C_3CActive High
0x00101C_2CActive High
0x00902C_5CActive High
0x00201C_3CActive High
0x00301C_4CActive High
0x00401C_5CActive High
0x00501C_6CActive High
0x00601C_7CActive High
0x00f0Free_PlayActive High
0xE0011Read PortDSW1
0x00003Active High
0x00014Active High
0x00025Active High
0x0003255 (Cheat)Active High
0x0004UprightActive High
0x0000CocktailActive High
0x00001Active High
0x00082Active High
0x00103Active High
0x00184Active High
0x00205Active High
0x00286Active High
0x00307Active High
0x00388Active High
0x00000Active High
0x00401Active High
0x0000OffActive High
0x0080OnActive High
0xE0021Read PortDSW2
0x0000SlowestActive High
0x00012Active High
0x00023Active High
0x00034Active High
0x00045Active High
0x00056Active High
0x00067Active High
0x0007FastestActive High
0x00001Active High
0x00082Active High
0x00103Active High
0x00184Active High
0x00205Active High
0x00286Active High
0x00307Active High
0x00388Active High
0x000040/30Active High
0x004030/20Active High
0x008020/15Active High
0x00c010/10Active High
0xE0031Read PortP1
0x0001Coin 1Active High
0x0002Button 1Active High
0x0004Button 2Active High
0x0008Start 1Active High
0x0010Joystick UpActive High
0x0020Joystick DownActive High
0x0040Joystick RightActive High
0x0080Joystick LeftActive High
0xE0041Read PortP2
0x0001Coin 2Active High
0x0002Button 1Active High
0x0004Button 2Active High
0x0008Start 2Active High
0x0010Joystick UpActive High
0x0020Joystick DownActive High
0x0040Joystick RightActive High
0x0080Joystick LeftActive High
Memory Area:cpu3_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM
0x20001Read NOP(/* irq ack? */)
0xFC00-0xFFFF1024RAM
Memory Area:cpu3_port_map
Address RangeLengthFunctionDescription
0x0000-0x00012Device Writeay1, ay8910_device, address_data_w
0x00011Device Readay1, ay8910_device, data_r
0x0002-0x00032Device Writeay2, ay8910_device, address_data_w
0x00031Device Readay2, ay8910_device, data_r
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x8FFF4096RAM(/* ??? */)
0x9000-0x9FFF4096RAM(/* ??? */)
0xA000-0xAFFF4096RAM(/* ??? */)
0xB000-0xBFFF4096RAM(/* ??? */)
0xC000-0xC7FF2048RAM, Sharedvram4 (/* radar bitmap */)
0xC800-0xCFFF2048Write Only, Sharedvram5 (/* "sprite1" bitmap */)
0xD000-0xD7FF2048Write Only, Sharedvram6 (/* "sprite2" bitmap */)
0xD800-0xDFFF2048RAM, Sharedvram7 (/* "sprite3" bitmap */)
0xE000-0xF3FF5120Read Only
0xE000-0xE3FF1024Write Only, Sharedvram1 (/* car tilemap */)
0xE400-0xEBFF2048Write Only, Sharedvram2 (/* bg1 tilemap */)
0xEC00-0xEFFF1024Write Only, Sharedvram0 (/* fg tilemap */)
0xF000-0xF3FF1024Write Only, Sharedvram3 (/* bg2 tilemap */)
0xF400-0xF4034Device Read/Writeppi8255_0, i8255_device, read, write
0xF480-0xF4834Device Read/Writeppi8255_2, i8255_device, read, write (/* "sprite1" placement */)
0xF500-0xF5034Device Read/Writeppi8255_3, i8255_device, read, write (/* "sprite2" placement */)
0xF580-0xF5834Device Read/Writeppi8255_4, i8255_device, read, write (/* "sprite3" placement */)
0xF782-0xF7876Write Only, Sharedscroll (/* bg scroll (three copies always identical) */)
0xF800-0xFFFF2048RAM
 

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
0x0000-0x1FFF81927.ic14CRC(2b4cbfe6) (Fluke: 295F)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81925.m.ic68CRC(a3aa5f2f) (Fluke: 8963)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81926.1.ic35CRC(bfddd550) (Fluke: F16E)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819211.30.ic87CRC(7485eaea) (Fluke: 207E)
0x2000-0x3FFF819214.31.ic110CRC(0d99a33e) (Fluke: 49B2)
0x4000-0x5FFF819215.32.ic111CRC(410fdf7c) (Fluke: 4216)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819210.40.ic99CRC(c370b177) (Fluke: ACD4)
Memory Area:gfx5
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819212.21.ic88CRC(684b7bb0) (Fluke: 41EC)
0x2000-0x3FFF819213.20.ic89CRC(d1ef110e) (Fluke: 52CD)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921.ic87CRC(6b2424e9) (Fluke: 0FEF)
0x2000-0x3FFF81922.ic86CRC(15111229) (Fluke: F041)
0x4000-0x5FFF81923.ic85CRC(a7782eee) (Fluke: 6099)
0x6000-0x7FFF81924.ic84CRC(8eb0b16b) (Fluke: 5AD7)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32tbp18s030.ic2CRC(c366a9c5)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81928.ic4CRC(9f9a3865) (Fluke: C3A6)
0x2000-0x3FFF81929.ic5CRC(b28b766c) (Fluke: BE9E)
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