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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.
Cosmic Alien (Universal, 1979)
Memory Area:cosmica_map
Address RangeLengthFunctionDescription
0x0000-0x3FFF16384ROM
0x4000-0x5FFF8192RAM, Sharedvideoram
0x6000-0x601F32Write Only, Sharedspriteram
0x68001Read PortP1
0x0001Button 1Active Low
0x0002Joystick RightActive Low
0x0004Joystick LeftActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x68011Read PortP2
0x0001Button 1Active Low
0x0002Joystick RightActive Low
0x0004Joystick LeftActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x68021Read PortDSW
0x0001CabinetActive High
0x0000UprightActive High
0x0001CocktailActive High
0x0002LivesActive High
0x00023Active High
0x00005Active High
0x000cCoinageActive High
0x00082C_1CActive High
0x000c1C_1CActive High
0x00041C_2CActive High
0x00001C_1CActive High
0x0030Bonus_LifeActive High
0x00305000Active High
0x002010000Active High
0x001015000Active High
0x0000NoneActive High
0x0040Start 2Active Low
0x0080Start 1Active Low
0x68031Readcosmica_pixel_clock_r
0x7000-0x700B12Writecosmica_sound_output_w
0x700C-0x700D2Writecosmic_color_register_w
0x700F1Writeflip_screen_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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048ii-7.n2CRC(aa6c6079) (Fluke: 58D6)
0x0800-0x0FFF2048ii-6.n1CRC(431e866c) (Fluke: F96F)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048ii-1.e3CRC(535ee0c5),tms2516 (Fluke: 385C)
0x0800-0x0FFF2048ii-2.e4CRC(ed3cf8f7),tms2516; has an & stamped on the chip (Fluke: BBD1)
0x1000-0x17FF2048ii-3.e5CRC(6a111e5e),tms2516 (Fluke: 84CF)
0x1800-0x1FFF2048ii-4.e6CRC(c9b5ca2a),tms2516 (Fluke: 5560)
0x2000-0x27FF2048ii-5.e7CRC(43666d68),tms2516; has an & stamped on the chip (Fluke: EB79)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32u7910.d9CRC(dfb60f19) (Fluke: A3E0)
0x0000-0x001F32u7910.d9CRC(dfb60f19) (Fluke: A3E0)
0x0000-0x001F32u7910.d9CRC(dfb60f19) (Fluke: A3E0)
Memory Area:user1
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF10249.e2CRC(ea4ee931),2708 (Fluke: 9581)
0x0000-0x03FF10249.e2CRC(ea4ee931),2708 (Fluke: 9581)
Memory Area:user2
Address RangeLengthLabel/LocationDescription
0x0000-0x03FF10248.k3CRC(acbd4e98) (Fluke: E07F)
0x0000-0x03FF10248.k3CRC(acbd4e98) (Fluke: E07F)
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