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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.
Top Racer (bootleg (EMT Germany), 1984)
Memory Area:drivfrcg
Address RangeLengthFunctionDescription
0x0000-0x0FFF4096ROM
0x1480-0x14BF64Mirror, Write, Shared0x6000, galaxold_attributesram_w, attributesram
0x14C0-0x14FF64Mirror, Write Only, Shared0x6000, , spriteram
0x15001Mirror, Read Port0x6000, IN0
0x15031Mirror, Write0x6000, galaxold_coin_counter_w
0x15801Mirror, Read Port0x6000, IN1
0x1580-0x15823Mirror, Device Write0x6000, cust, galaxian_sound_device, background_enable_w
0x15831Mirror, Write NOP0x6000,
0x15851Mirror, Write NOP0x6000,
0x1586-0x15872Mirror, Device Write0x6000, cust, galaxian_sound_device, lfo_freq_w
0x16001Mirror, Read Port, Device Write0x6000, DSW0, cust, galaxian_sound_device, pitch_w
0x17001Mirror, Read Port, Write NOP0x6000, DSW1,
0x17011Mirror, Write NOP0x6000,
0x1704-0x17074Mirror, Device Write0x6000, cust, galaxian_sound_device, vol_w
0x1800-0x1BFF1024Mirror, Write, Shared0x6000, galaxold_videoram_w, videoram
0x1C00-0x1FFF1024Mirror, RAM0x6000,
0x2000-0x2FFF4096ROM
0x4000-0x4FFF4096ROM
0x6000-0x6FFF4096ROM
Memory Area:drivfrcg_io
Address RangeLengthFunctionDescription
0x00001Read Port, Write NOPSENSE,
0x00001Readdrivfrcg_port0_r
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x1000-0x1FFF409601.binCRC(300a6750)
0x3000-0x3FFF409602.binCRC(f04e14c4)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x2800-0x2BFF102403.binCRC(9ab604cb)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32tbp18s030.02CRC(3110ddae) (Fluke: EA76)
0x0020-0x003F32tbp18s030.01CRC(0f0782af) (Fluke: 962E)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256tbp24s10.binCRC(8c0d886d)
0x0100-0x02FF512tbp28s42.binCRC(9b8f310a)
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