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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.
Space Invaders / Space Invaders M (Taito / Midway, 1978)
Memory Area:invaders_io_map
Address RangeLengthFunctionDescription
0x00001Mirror, Read Port0x04, IN0
0x0001UnknownActive High
0x0000OffActive High
0x0001OnActive High
0x0006SpecialActive High
0x0008UnusedActive Low
0x0070SpecialActive High
0x0080SpecialActive High
0x00011Mirror, Read Port0x04, IN1
0x0001SpecialActive High
0x0002Start 2Active High
0x0004Start 1Active High
0x0008UnusedActive Low
0x0070SpecialActive High
0x0080UnusedActive High
0x00021Mirror, Read Port0x04, IN2
0x0003LivesActive High
0x00003Active High
0x00014Active High
0x00025Active High
0x00036Active High
0x0004UnusedActive High
0x0008Bonus_LifeActive High
0x00081000Active High
0x00001500Active High
0x0070SpecialActive High
0x0080OffActive High
0x0000OnActive High
0x00021Device Writemb14241, mb14241_device, shift_count_w
0x00031Writeinvaders_audio_1_w
0x00031Mirror, Device Read0x04, mb14241, mb14241_device, shift_result_r
0x00041Device Writemb14241, mb14241_device, shift_data_w
0x00051Writeinvaders_audio_2_w
0x00061Device Writewatchdog, watchdog_timer_device, reset_w
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x1FFF8192ROM, Write NOP
0x2000-0x3FFF8192Mirror, RAM, Shared0x4000, , main_ram
0x4000-0x5FFF8192ROM, Write NOP
 

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
0x0000-0x07FF2048invaders.hCRC(734f5ad8) (Fluke: E04E)
0x0800-0x0FFF2048invaders.gCRC(6bfaca4a) (Fluke: D8C2)
0x1000-0x17FF2048invaders.fCRC(0ccead96) (Fluke: 5804)
0x1800-0x1FFF2048invaders.eCRC(14e538b0) (Fluke: C5AF)
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