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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.
Aliens (Konami, 1990)
Memory Area:aliens_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024Devicebank0000, address_map_bank_device, amap8
0x0400-0x1FFF7168RAM
0x2000-0x3FFF8192ROM Bankrombank (/* banked ROM */)
0x4000-0x7FFF16384Read/Writek052109_051960_r, k052109_051960_w
0x5F801Read PortDSW3
0x0001Flip_ScreenActive High
0x0001OffActive High
0x0000OnActive High
0x0010Service 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x5F811Read PortP1
0x5F821Read PortP2
0x5F831Read PortDSW2
0x0003LivesActive High
0x00031Active High
0x00022Active High
0x00013Active High
0x00005Active High
0x0060DifficultyActive High
0x0060EasyActive High
0x0040NormalActive High
0x0020HardActive High
0x0000Very_HardActive High
0x0080Demo_SoundsActive High
0x0080OffActive High
0x0000OnActive High
0x5F841Read PortDSW1
0x5F881Device Read, Writewatchdog, watchdog_timer_device, reset_r, aliens_coin_counter_w (/* coin counters */)
0x5F8C1Writealiens_sh_irqtrigger_w (/* cause interrupt on audio CPU */)
0x8000-0xFFFF32768ROM, Regionmaincpu, 0x28000 (/* ROM e24_j02.bin */)
Memory Area:aliens_sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM(/* ROM g04_b03.bin */)
0x8000-0x87FF2048RAM(/* RAM */)
0xA000-0xA0012Device Read/Writeymsnd, ym2151_device, read, write
0xC0001Device Readsoundlatch, generic_latch_8_device, read
0xE000-0xE00D14Device Read/Writek007232, k007232_device, read, write
Memory Area:bank0000_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x0400-0x07FF1024RAM Device Write, Sharedpalette, palette_device, write, palette
 

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
0x0000-0x7FFF32768875_b03.g04CRC(1ac4d283) (Fluke: A97D)
0x0000-0x7FFF32768875_b03.g04CRC(1ac4d283) (Fluke: A97D)
0x0000-0x7FFF32768875_b03.g04CRC(1ac4d283) (Fluke: A97D)
0x0000-0x7FFF32768875_b03.g04CRC(1ac4d283) (Fluke: A97D)
Memory Area:k007232
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
0x0000-0x3FFFF262144875b04.e05CRC(4e209ac8) (Fluke: CE60)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072875_j01.c24CRC(6a529cd6) (Fluke: D406)
0x20000-0x2FFFF65536875_j02.e24CRC(56c20971) (Fluke: A771)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
0x0000-0x00FF256821a08.h14CRC(7da55800),priority encoder (not used) (Fluke: 366A)
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