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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.
The Main Event (Konami, 1988)
Memory Area:mainevt_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384Read/Writek052109_051960_r, k052109_051960_w
0x1F801Writemainevt_bankswitch_w
0x1F841Device Writesoundlatch, generic_latch_8_device, write (/* probably */)
0x1F881Writemainevt_sh_irqtrigger_w (/* probably */)
0x1F8C-0x1F8D2Write NOP(/* ??? */)
0x1F901Writemainevt_coin_w (/* coin counters + lamps */)
0x1F941Read PortSYSTEM
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Coin 3Active Low
0x0008Coin 4Active Low
0x0010Service 1Active Low
0x0020Service 2Active Low
0x0040Service 3Active Low
0x0080Service 4Active Low
0x1F951Read PortP1
0x1F961Read PortP2
0x1F971Read PortDSW1
0x000fCoinageActive High
0x00024C_1CActive High
0x00053C_1CActive High
0x00082C_1CActive High
0x00043C_2CActive High
0x00014C_3CActive High
0x000f1C_1CActive High
0x00004C_5CActive High
0x00033C_4CActive High
0x00072C_3CActive High
0x000e1C_2CActive High
0x00062C_5CActive High
0x000d1C_3CActive High
0x000c1C_4CActive High
0x000b1C_5CActive High
0x000a1C_6CActive High
0x00091C_7CActive High
0x1F981Read PortDSW3
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x00f0UnusedActive Low
0x1F991Read PortP3
0x1F9A1Read PortP4
0x1F9B1Read PortDSW2
0x000060Active High
0x000870Active High
0x001080Active High
0x001890Active High
0x0060DifficultyActive High
0x0060EasyActive High
0x0040NormalActive High
0x0020HardActive High
0x0000Very_HardActive High
0x0080Demo_SoundsActive High
0x0080OffActive High
0x0000OnActive High
0x4000-0x5DFF7680RAM
0x5E00-0x5FFF512RAM Device Write, Sharedpalette, palette_device, write, palette
0x6000-0x7FFF8192ROM Bankrombank
0x8000-0xFFFF32768ROM
Memory Area:mainevt_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x83FF1024RAM
0x90001Device Writeupd, upd7759_device, port_w
0xA0001Device Readsoundlatch, generic_latch_8_device, read
0xB000-0xB00D14Device Read/Writek007232, k007232_device, read, write
0xD0001Readmainevt_sh_busy_r
0xE0001Writemainevt_sh_irqcontrol_w
0xF0001Writemainevt_sh_bankswitch_w
 

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
0x0000-0x7FFF32768799c01.f7CRC(447c4c5c) (Fluke: 0968)
0x0000-0x7FFF32768799c01.f7CRC(447c4c5c) (Fluke: 0968)
0x0000-0x7FFF32768799c01.f7CRC(447c4c5c) (Fluke: 0968)
Memory Area:k007232
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288799b03.d4CRC(f1cfd342) (Fluke: 3DFA)
0x0000-0x7FFFF524288799b03.d4CRC(f1cfd342) (Fluke: 3DFA)
0x0000-0x7FFFF524288799b03.d4CRC(f1cfd342) (Fluke: 3DFA)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536799y02.k11CRC(e2e7dbd5) (Fluke: A00F)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF25663s141n.k14CRC(61f6c8d1),priority encoder (not used) (Fluke: 8F88)
0x0000-0x00FF25663s141n.k14CRC(61f6c8d1),priority encoder (not used) (Fluke: 8F88)
0x0000-0x00FF25663s141n.k14CRC(61f6c8d1),priority encoder (not used) (Fluke: 8F88)
Memory Area:upd
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288799b06.c22CRC(2c8c47d7) (Fluke: 1E59)
0x0000-0x7FFFF524288799b06.c22CRC(2c8c47d7) (Fluke: 1E59)
0x0000-0x7FFFF524288799b06.c22CRC(2c8c47d7) (Fluke: 1E59)
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