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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.
Megadon (Epos Corporation (Photar Industries license), 1982)
Memory Area:epos_map
Address RangeLengthFunctionDescription
0x0000-0x77FF30720ROM
0x7800-0x7FFF2048RAM
0x8000-0xFFFF32768RAM, Sharedvideoram
Memory Area:io_map
Address RangeLengthFunctionDescription
0x00001Read Port, Device WriteDSW, watchdog, watchdog_timer_device, reset_w
0x0001CoinageActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x0050LivesActive High
0x00003Active High
0x00104Active High
0x00405Active High
0x00506Active High
0x0000SlowActive High
0x0002FastActive High
0x0020SlowActive High
0x0000FastActive High
0x0004SlowActive High
0x0000FastActive High
0x0008EasyActive High
0x0000HardActive High
0x0000ArcadeActive High
0x0080ContestActive High
0x00011Read Port, WriteSYSTEM, port_1_w
0x0001Coin 1Active High
0x0002UnknownActive Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0020UnknownActive Low
0x0040SpecialActive Low
0x0080SpecialActive Low
0x00021Read Port, Device WriteINPUTS, aysnd, ay8910_device, data_w
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Button 1Active Low
0x0008Button 2Active Low
0x00f0UnknownActive Low
0x00031Read PortUNK
0x00ffUnknownActive High
0x00061Device Writeaysnd, ay8910_device, address_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:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x0FFF40962732u10b.binCRC(af8fbe80) (Fluke: 3CE2)
0x1000-0x1FFF40962732u09b.binCRC(097d1e73) (Fluke: 8BCF)
0x2000-0x2FFF40962732u08b.binCRC(526784da) (Fluke: 60AA)
0x3000-0x3FFF40962732u07b.binCRC(5b060910) (Fluke: 0B89)
0x4000-0x4FFF40962732u06b.binCRC(8ac8af6d) (Fluke: D455)
0x5000-0x5FFF40962732u05b.binCRC(052bb603) (Fluke: 7E5E)
0x6000-0x6FFF40962732u04b.binCRC(9b8b7e92) (Fluke: A303)
0x7000-0x77FF20482716u11b.binCRC(599b8b61) (Fluke: 1C96)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F3274s288.binCRC(c779ea99) (Fluke: 46BE)
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