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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.
Main Event (SNK, 1984)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0xBFFF49152ROM
0xC0001Read PortIN0
0x0001Coin 1Active High
0x0002Coin 2Active High
0x0004Service 1Active High
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020SpecialActive High
0x0040UnknownActive Low
0x0080ServiceActive Low
0xC1001Read PortIN1
0x0001Joystickleft UpActive Low
0x0002Joystickleft DownActive Low
0x0004Joystickleft LeftActive Low
0x0008Joystickleft RightActive Low
0x0010Joystickright UpActive Low
0x0020Joystickright DownActive Low
0x0040Joystickright LeftActive Low
0x0080Joystickright RightActive Low
0xC2001Read PortIN2
0x0001Joystickleft UpActive Low
0x0002Joystickleft DownActive Low
0x0004Joystickleft LeftActive Low
0x0008Joystickleft RightActive Low
0x0010Joystickright UpActive Low
0x0020Joystickright DownActive Low
0x0040Joystickright LeftActive Low
0x0080Joystickright RightActive Low
0xC3001Read PortIN3
0x0001Button 1Active Low
0x0002Button 2Active Low
0x0004Button 3Active Low
0x0008Button 4Active Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Button 4Active Low
0xC4001Read PortDSW1
0x0001UnknownActive High
0x0001OffActive High
0x0000OnActive High
0x0002UnknownActive High
0x0002OffActive High
0x0000OnActive High
0x0004UnknownActive High
0x0004OffActive High
0x0000OnActive High
0x0008UnknownActive High
0x0008OffActive High
0x0000OnActive High
0x0010UnknownActive High
0x0010OffActive High
0x0000OnActive High
0x0020UnknownActive High
0x0020OffActive High
0x0000OnActive High
0x0040UnknownActive High
0x0040OffActive High
0x0000OnActive High
0x0080UnknownActive High
0x0080OffActive High
0x0000OnActive High
0xC5001Read PortDSW2
0x0007CoinageActive High
0x00043C_1CActive High
0x00023C_1CActive High
0x00013C_1CActive High
0x00062C_1CActive High
0x00071C_1CActive High
0x00031C_2CActive High
0x00051C_3CActive High
0x0000Free_PlayActive High
0x0008DifficultyActive High
0x0008EasyActive High
0x0000HardActive High
0x0010NormalActive High
0x0000ShortActive High
0x0060Demo Sounds OffActive High
0x0020Demo Sounds OnActive High
0x0000FreezeActive High
0x0040Endless Game (Cheat)Active High
0x00801 CreditActive High
0x00002 CreditsActive High
0xC6001Writec600_w
0xC7001Writesound_command_w
0xD800-0xDBFF1024RAM Write, Sharedbgram_w, bgram
0xDC00-0xE7FF3072RAM
0xE800-0xEFFF2048RAM, Sharedspriteram
0xF000-0xF7FF2048RAM Write, Sharedfgram_w, fgram (// + work RAM)
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0xA0001Device Readsoundlatch, generic_latch_8_device, read
0xC0001Readsound_ack_r
0xE000-0xE0012Device Writeay1, ay8910_device, address_data_w
0xE002-0xE0032Write NOP(// ? always FFFF, snkwave leftover?)
0xE008-0xE0092Device Writeay2, ay8910_device, address_data_w
Memory Area:sound_portmap
Address RangeLengthFunctionDescription
0x00001Read NOP
 

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
0x0000-0x3FFF16384snk.p07CRC(4208391e) (Fluke: 88F1)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192snk.p12CRC(ecf87eb7) (Fluke: B0E7)
0x2000-0x3FFF8192snk.p11CRC(3f6bc5ba) (Fluke: 68F8)
0x4000-0x5FFF8192snk.p10CRC(b5147a96) (Fluke: AEE3)
0x6000-0x7FFF8192snk.p09CRC(0ebcf837) (Fluke: 2D72)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192snk.p13CRC(2eb624a4) (Fluke: E1E5)
0x2000-0x3FFF8192snk.p16CRC(dc502869) (Fluke: 5CF4)
0x4000-0x5FFF8192snk.p19CRC(58d566a1) (Fluke: CE95)
0x6000-0x7FFF8192snk.p14CRC(bb927d82) (Fluke: 9A10)
0x8000-0x9FFF8192snk.p17CRC(66f60c32) (Fluke: F46C)
0xA000-0xBFFF8192snk.p20CRC(d12c6333) (Fluke: 0105)
0xC000-0xDFFF8192snk.p15CRC(d242486d) (Fluke: 3999)
0xE000-0xFFFF8192snk.p18CRC(838b12a3) (Fluke: 4E2E)
0x10000-0x11FFF8192snk.p21CRC(8961a51e) (Fluke: C24F)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192snk.p01CRC(00db1ca2) (Fluke: 323B)
0x2000-0x3FFF8192snk.p02CRC(df5c86b5) (Fluke: C744)
0x4000-0x5FFF8192snk.p03CRC(5c2b7bca) (Fluke: D6F6)
0x6000-0x7FFF8192snk.p04CRC(68b4b2a1) (Fluke: 29AD)
0x8000-0x9FFF8192snk.p05CRC(580a29b4) (Fluke: DC5F)
0xA000-0xBFFF8192snk.p06CRC(5f8a60a2) (Fluke: F267)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048main3.binCRC(78b29dde) (Fluke: 33E3)
0x0400-0x0BFF2048main2.binCRC(7c314c93) (Fluke: 0140)
0x0800-0x0FFF2048main1.binCRC(deb895c4) (Fluke: 9384)
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