Memory Area:cpu4
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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.
Driver's Edge (Strata / Incredible Technologies, 1994)
Memory Area:drivedge_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144Mirror, RAM, Shared0x40000, , nvram
0x0100-0x03FF768Mirror, Read/Write0x40000, test1_r, test1_w
0x0C00-0x7FFF29696Mirror, Read/Write0x40000, test2_r, test2_w
0x80000-0x800034Read Port80000
0xffffUnknownActive High
0xff0000Pedal 3Active High
0x82000-0x820034Read Port82000
0xffffUnknownActive High
0xff0000Pedal 2Active High
0x84000-0x840034Read/Writesound_data32_r, sound_data32_w
0x88000-0x880034Readdrivedge_steering_r
0x8A000-0x8A0034Read, Write NOPdrivedge_gas_r,
0x8C000-0x8C0034Read Port8c000
0xffffUnknownActive High
0x10000Coin 1Active Low
0x20000Coin 2Active Low
0x40000Gear 1Active Low
0x80000Gear 2Active Low
0x100000Gear 3Active Low
0x200000Gear 4Active Low
0x800000UnusedActive Low
0x8E000-0x8E0034Read Port, Write NOP8e000,
0xffffUnknownActive High
0x10000FanActive Low
0x20000Tow TruckActive Low
0x40000HornActive Low
0x80000Turbo BoostActive Low
0x100000Network OnActive Low
0x200000KeyActive Low
0x400000Service 1Active Low
0x800000UnusedActive Low
0x100000-0x10000F16Write, Shareddrivedge_zbuf_control_w, drivedge_zctl
0x180000-0x1800034Writedrivedge_color0_w
0x1A0000-0x1BFFFF131072RAM Device Write, Sharedpalette, palette_device, write, palette
0x1C0000-0x1C00034Write NOP
0x1E0000-0x1E0113276Read/Write, Shareditech020_video_r, itech020_video_w, video
0x1E4000-0x1E40034Writetms_reset_assert_w
0x1EC000-0x1EC0034Writetms_reset_clear_w
0x200000-0x2000034Read Port200000
0xffffUnknownActive High
0x1000000UnknownActive Low
0x2000000Coin 3Active Low
0x4000000CustomActive Low
0x8000000SpecialActive Low
0x00001Active High
0x100000002Active High
0x200000003Active High
0x300000004Active High
0x400000005Active High
0x500000006Active High
0x600000007Active High
0x700000008Active High
0x280000-0x280FFF4096RAM Write, Sharedtms1_68k_ram_w, tms1_ram
0x300000-0x300FFF4096RAM Write, Sharedtms2_68k_ram_w, tms2_ram
0x380000-0x3800034Write NOP(// AM_DEVWRITE("watchdog", watchdog_timer_device, reset16_w))
0x600000-0x607FFF32768ROM, Region, Shareduser1, 0, main_rom
Memory Area:drivedge_tms1_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192RAM, Sharedtms1_boot
0x8000-0x83FF1024Mirror, RAM Write, Shared0x400, tms1_trigger_w, tms1_ram
0x80000-0xBFFFF262144RAM
Memory Area:drivedge_tms2_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024Mirror, RAM Write, Shared0x8400, tms2_trigger_w, tms2_ram
0x80000-0x8FFFF65536RAM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x00001Writesound_return_w
0x04001Readsound_data_r
0x0800-0x083F64Mirror, Device Read/Write0x80, ensoniq, es5506_device, read, write
0x0C001Writesound_bank_w
0x10001Write NOP(/* noisy */)
0x1400-0x140F16Device Read/Writevia6522_0, via6522_device, read, write
0x2000-0x3FFF8192RAM
0x4000-0x7FFF16384ROM Banksoundbank
0x8000-0xFFFF32768ROM
Memory Area:timekill_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384RAM, Sharednvram
0x40000-0x400012Read PortP1
0x48000-0x480012Read PortP2
0x50000-0x500012Read Port, WriteSYSTEM, timekill_intensity_w
0x58000-0x580012Read Port, Device WriteDIPS, watchdog, watchdog_timer_device, reset16_w
0x60000-0x600012Writetimekill_colora_w
0x68000-0x680012Writetimekill_colorbc_w
0x70000-0x700012Write NOP(/* noisy */)
0x78000-0x780012Writesound_data_w
0x80000-0x8007F128Read/Write, Shareditech32_video_r, itech32_video_w, video
0xA0000-0xA00012Writeint1_ack_w
0xC0000-0xC7FFF32768RAM Device Write, Sharedpalette, palette_device, write, palette
0x100000-0x17FFFF524288ROM, Region, Shareduser1, 0, main_rom
 

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.   
0x0000-0x7FFF32768de-u130.binCRC(873579b0) (Fluke: B990)
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF32768de-u7net.binCRC(dea8b9de) (Fluke: C85A)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x10000-0x27FFF98304desndu17.binCRC(6e8ca8bc) (Fluke: 06A8)
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