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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.
Head On (bootleg (EFG Sanremo), 1979)
Memory Area:headonb_io_map
Address RangeLengthFunctionDescription
0x00011Read PortIN0
0x0001Joystick DownActive Low
0x0002Joystick RightActive Low
0x0004Joystick UpActive Low
0x0008Joystick LeftActive Low
0x0010Button 1Active Low
0x0020Start 1Active Low
0x0040UnknownActive High
0x0080Coin 1Active Low
0x00041Read PortIN1
Memory Area:headonb_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM, Mirror0x4000
0xE000-0xE3FF1024RAM Write, Sharedvideo_ram_w, video_ram
0xFF00-0xFFFF256RAM
 

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
0x0000-0x03FF102410.binCRC(198f4671)
0x0400-0x07FF10249.binCRC(2b4d3afe)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF10241.binCRC(11586f44)
0x0400-0x07FF10242.binCRC(c3449b99)
0x0800-0x0BFF10243.binCRC(9c80b99e)
0x0C00-0x0FFF10244.binCRC(ed5ecc4e)
0x2000-0x23FF10245.binCRC(13cdb6da)
0x2400-0x27FF10246.binCRC(e498d21b)
0x2800-0x2BFF10247.binCRC(ce2ef8d9)
0x2C00-0x2FFF10248.binCRC(85f216e0)
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