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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.
Mexico 86 (bootleg, 1986)
Memory Area:mexico86_m68705_map
Address RangeLengthFunctionDescription
0x00001Read/Writemexico86_68705_port_a_r,mexico86_68705_port_a_w
0x00011Read/Writemexico86_68705_port_b_r,mexico86_68705_port_b_w
0x00021Read PortIN0 (/* COIN */)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x00041Writemexico86_68705_ddr_a_w
0x00051Writemexico86_68705_ddr_b_w
0x000A1Write NOP(/* looks like a bug in the code, writes to */)
0x0010-0x007F112RAM
0x0080-0x07FF1920ROM
Memory Area:mexico86_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xBFFF16384ROM Bankbank1 (/* banked roms */)
0xC000-0xE7FF10240RAM, Sharedshare1 (/* shared with sound cpu */)
0xC000-0xD4FF5376RAM, Sharedvideoram
0xD500-0xD7FF768RAM, Sharedobjectram
0xE800-0xE8FF256RAM, Sharedprotection_ram (/* shared with mcu */)
0xE900-0xEFFF1792RAM
0xF0001Writemexico86_bankswitch_w (/* program and gfx ROM banks */)
0xF0081Writemexico86_f008_w (/* cpu reset lines + other unknown stuff */)
0xF0101Read PortIN3
0x0001Service 1Active Low
0x0002UnknownActive Low
0x0004TiltActive Low
0x0008Start 1Active Low
0x0010Start 2Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xF0181Write NOP(/* watchdog? */)
0xF800-0xFFFF2048RAM, Sharedshare2 (/* communication ram - to connect 4 players's subboard */)
Memory Area:mexico86_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0xA7FF10240RAM, Sharedshare1
0xA800-0xBFFF6144RAM
0xC000-0xC0012Read, Device Writekiki_ym2203_r, ymsnd, ym2203_device, write
Memory Area:mexico86_sub_cpu_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x47FF2048RAM(/* sub cpu ram */)
0x8000-0x87FF2048RAM, Sharedshare2 (/* shared with main */)
0xC0001Read PortIN4
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 2Active Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xC0011Read PortIN5
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 2Active Low
0x0020Button 1Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xC0021Read PortIN6
0x0001Coin 3Active High
0x0002UnknownActive Low
0x0004Start 3Active Low
0x00f8UnknownActive Low
0xC0031Read PortIN7
0x0001Coin 4Active High
0x0002UnknownActive Low
0x0004Start 4Active Low
0x00f8UnknownActive Low
0xC0041Writemexico86_sub_output_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
0x0000-0x7FFF32768a87-06.f6CRC(1625b587) (Fluke: 334C)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x8000-0xFFFF327684_d.binCRC(57cfdbca) (Fluke: C8AC)
0x10000-0x17FFF327685_c.binCRC(e42fa143) (Fluke: 8BE0)
0x28000-0x2FFFF327686_b.binCRC(a4607989) (Fluke: A940)
0x30000-0x37FFF327687_a.binCRC(245036b1) (Fluke: 6A3D)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x8000-0x17FFF655361_f.binCRC(0b93e68e),banked at 0x8000 (Fluke: 2749)
Memory Area:mcu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF204868_h.binCRC(ff92f816) (Fluke: 7E0B)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256a87-10.g15CRC(be6eb1f0),all proms are 63S141AN or compatible type (Fluke: 700D)
0x0100-0x01FF256a87-12.g12CRC(3e953444) (Fluke: 1C48)
0x0200-0x02FF256a87-11.g14CRC(14f6c28d) (Fluke: 87C9)
Memory Area:sub
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFF16384a87-09-1CRC(6a2ad32f) (Fluke: 4D7E)
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