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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.
Alien Challenge (IGS, 1994)
Memory Area:aliencha_map
Address RangeLengthFunctionDescription
0x0000-0x1FFFFF2097152ROM
0x200000-0x20FFFF65536RAM
0x210000-0x21FFFF65536RAM, Sharedpriority_ram (// PRIORITY)
0x300000-0x30FFFF65536RAM Write, Sharedlordgun_vram_0_w, vram.0 (// BACKGROUND 1)
0x310000-0x313FFF16384RAM Write, Sharedlordgun_vram_1_w, vram.1 (// BACKGROUND 2)
0x314000-0x314FFF4096RAM Write, Sharedlordgun_vram_2_w, vram.2 (// BACKGROUND 3)
0x315000-0x317FFF12288RAM(//)
0x318000-0x319FFF8192RAM Write, Sharedlordgun_vram_3_w, vram.3 (// TEXT)
0x31C000-0x31C7FF2048RAM, Sharedscrollram (// LINE OFFSET)
0x400000-0x4007FF2048RAM, Sharedspriteram (// ANIMATE)
0x500000-0x500FFF4096RAM Write, Sharedlordgun_paletteram_w, paletteram
0x502000-0x5020012Write Only, Sharedscroll_x.0
0x502200-0x5022012Write Only, Sharedscroll_x.1
0x502400-0x5024012Write Only, Sharedscroll_x.2
0x502600-0x5026012Write Only, Sharedscroll_x.3
0x502800-0x5028012Write Only, Sharedscroll_y.0
0x502A00-0x502A012Write Only, Sharedscroll_y.1
0x502C00-0x502C012Write Only, Sharedscroll_y.2
0x502E00-0x502E012Write Only, Sharedscroll_y.3
0x503000-0x5030012Writelordgun_priority_w
0x504000-0x5040012Writelordgun_soundlatch_w
0x506000-0x5060078Device Read/Write 8-bitppi8255_0, i8255_device, read, write, 0x00ff
0x0001SpecialActive High
0x0002Service 1Active Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x508000-0x5080078Device Read/Write 8-bitppi8255_1, i8255_device, read, write, 0x00ff
0x0001Start 1Active Low
0x0002Joystick UpActive Low
0x0004Joystick DownActive Low
0x0008Joystick LeftActive Low
0x0010Joystick RightActive Low
0x0020Button 1Active Low
0x0040Button 2Active Low
0x0080Button 3Active Low
0x50B900-0x50B9FF256Read/Writealiencha_protection_r, aliencha_protection_w
Memory Area:aliencha_soundio_map
Address RangeLengthFunctionDescription
0x30001Device Readsoundlatch2, generic_latch_8_device, read
0x40001Device Readsoundlatch, generic_latch_8_device, read
0x50001Write NOP(// writes 03 then 07 at end of NMI)
0x7000-0x70056Device Writeymf, ymf278b_device, write
0x70001Device Readymf, ymf278b_device, read
0x74001Device Read/Writeoki, okim6295_device, read, write
0x78001Device Read/Writeoki2, okim6295_device, read, write
Memory Area:lordgun_soundmem_map
Address RangeLengthFunctionDescription
0x0000-0xEFFF61440ROM
0xF000-0xFFFF4096RAM
 

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
0x0000-0x1FFFFF2097152igsc0102.u81CRC(e3432be3)
0x0000-0x1FFFFF2097152igsc0102.u81CRC(e3432be3)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144hfh_g.u65CRC(ec469b57) (Fluke: 0F1C)
0x0000-0x3FFFF262144hfh_g.u65CRC(ec469b57) (Fluke: 0F1C)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144hfh_g.u66CRC(7cfcd98e) (Fluke: FEF9)
0x0000-0x3FFFF262144hfh_g.u66CRC(7cfcd98e) (Fluke: FEF9)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536hfh_s.u86CRC(5728a9ed) (Fluke: A5E6)
0x0000-0xFFFF65536hfh_s.u86CRC(5728a9ed) (Fluke: A5E6)
Memory Area:sprites
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFFF4194304igsa0101.u3CRC(374d07c4)
0x0000-0x3FFFFF4194304igsa0101.u3CRC(374d07c4)
0x400000-0x7FFFFF4194304igsa0102.u2CRC(dbeee7ac)
0x400000-0x7FFFFF4194304igsa0102.u2CRC(dbeee7ac)
0x800000-0xBFFFFF4194304igsa0103.u1CRC(e5f19041)
0x800000-0xBFFFFF4194304igsa0103.u1CRC(e5f19041)
Memory Area:tiles0
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFFF1048576igst0101.u9CRC(2ce12d7b)
0x0000-0xFFFFF1048576igst0101.u9CRC(2ce12d7b)
0x100000-0x1FFFFF1048576igst0102.u10CRC(542a76a0)
0x100000-0x1FFFFF1048576igst0102.u10CRC(542a76a0)
0x200000-0x2FFFFF1048576igst0103.u11CRC(adf5698a)
0x200000-0x2FFFFF1048576igst0103.u11CRC(adf5698a)
Memory Area:tiles1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152igsb0101.u8CRC(5c995f7e)
0x0000-0x1FFFFF2097152igsb0101.u8CRC(5c995f7e)
0x200000-0x3FFFFF2097152igsb0102.u7CRC(a2ae9baf)
0x200000-0x3FFFFF2097152igsb0102.u7CRC(a2ae9baf)
0x400000-0x5FFFFF2097152igsb0103.u6CRC(11b927af)
0x400000-0x5FFFFF2097152igsb0103.u6CRC(11b927af)
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