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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.
Mad Alien (Data East Corporation, 1980)
Memory Area:audio_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024Mirror, RAM0x1c00,
0x6000-0x60034Mirror, RAM0x1ffc, (/* unknown device in an epoxy block, might be tilt detection */)
0x80001Mirror, Read0x1ffc, madalien_sound_command_r
0x8000-0x80012Mirror, Device Write0x1ffc, aysnd, ay8910_device, address_data_w
0x80021Mirror, Device Write0x1ffc, soundlatch2, generic_latch_8_device, write
0xF800-0xFFFF2048ROM
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x6000-0x63FF1024RAM Write, Sharedmadalien_videoram_w, videoram
0x6400-0x67FF1024RAM
0x6800-0x7FFF6144RAM Write, Sharedmadalien_charram_w, charram
0x80001Mirror, Device Write0x0ff0, crtc, mc6845_device, address_w
0x80011Mirror, Device Read/Write0x0ff0, crtc, mc6845_device, register_r, register_w
0x80041Mirror, Write Only, Shared0x0ff0, , video_control
0x80051Mirror, Write0x0ff0, madalien_output_w
0x80061Mirror, Device Read, Write0x0ff0, soundlatch2, generic_latch_8_device, read, madalien_sound_command_w
0x80081Mirror, RAM Read, Shared0x07f0, shift_r, shift_hi
0x80091Mirror, RAM Read, Shared0x07f0, shift_rev_r, shift_lo
0x800B1Mirror, Write Only, Shared0x07f0, , video_flags
0x800C1Mirror, Write Only, Shared0x07f0, , headlight_pos
0x800D1Mirror, Write Only, Shared0x07f0, , edge1_pos
0x800E1Mirror, Write Only, Shared0x07f0, , edge2_pos
0x800F1Mirror, Write Only, Shared0x07f0, , scroll
0x90001Mirror, Read Port0x0ff0, PLAYER1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Start 1Active Low
0x0040Start 2Active Low
0x0080UnusedActive Low
0x90011Mirror, Read Port0x0ff0, DSW
0x0003LivesActive High
0x00003Active High
0x00014Active High
0x00025Active High
0x00036Active High
0x000cCoinageActive High
0x000c2C_1CActive High
0x00001C_1CActive High
0x00041C_2CActive High
0x0030Bonus_LifeActive High
0x00003000Active High
0x00105000Active High
0x00207000Active High
0x0030neverActive High
0x0040CabinetActive High
0x0000UprightActive High
0x0040CocktailActive High
0x0080CustomActive High
0x90021Mirror, Read Port0x0ff0, PLAYER2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020UnusedActive Low
0x0040UnusedActive Low
0x0080Coin 1Active Low
0xA000-0xFFFF24576ROM
 

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
0xF800-0xFBFF1024m8.4deCRC(cfd19dab) (Fluke: AE1E)
0xFC00-0xFFFF1024m9.3deCRC(48f30f24) (Fluke: C5C6)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024mc.3kCRC(2daadfb7) (Fluke: 0418)
0x0000-0x03FF1024mc.3kCRC(2daadfb7)
0x0400-0x07FF1024md.3lCRC(3ee1287a) (Fluke: 7486)
0x0800-0x0BFF1024me.3mCRC(45a5c201) (Fluke: A23F)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024ma-.2bcCRC(aab16446) (Fluke: F432)
0x0000-0x03FF1024ma-.2bcCRC(aab16446) (Fluke: F432)
0x0000-0x03FF1024ma-.2bcCRC(aab16446) (Fluke: F432)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0xC000-0xC7FF2048m7.3fCRC(4d12f89d) (Fluke: BCF3)
0xC800-0xCFFF2048m6.3hjCRC(1bc4a57b) (Fluke: 1334)
0xD000-0xD7FF2048m5.3kCRC(8db99572) (Fluke: 33C3)
0xD800-0xDFFF2048m4.3lCRC(fba671af) (Fluke: 580B)
0xE000-0xE7FF2048m3.4fCRC(1aad640d) (Fluke: 3BAE)
0xE800-0xEFFF2048m2.4hjCRC(cbd533a0) (Fluke: 6DE8)
0xF000-0xF7FF2048m1.4kCRC(ad654b1d) (Fluke: D776)
0xF800-0xFFFF2048m0.4lCRC(cf7aa787) (Fluke: 1B0B)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32mg.7eCRC(3395b31f) (Fluke: FAA4)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF1024mf.4hCRC(e9cba773) (Fluke: 162D)
0x0000-0x03FF1024mf.4hCRC(e9cba773)
Memory Area:user2
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048mb-.5cdCRC(cb801e49) (Fluke: CED7)
0x0000-0x07FF2048mb-.5cdCRC(cb801e49) (Fluke: CED7)
0x0000-0x07FF2048mb-.5cdCRC(cb801e49) (Fluke: CED7)
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