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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 II (Midway, 1980)
Memory Area:invad2ct_io_map
Address RangeLengthFunctionDescription
0x00001Mirror, Read Port0x04, IN0
0x0002UnusedActive High
0x0004UnusedActive Low
0x0008UnusedActive High
0x0010UnusedActive Low
0x0020UnusedActive Low
0x0040UnusedActive Low
0x0080UnusedActive Low
0x00011Mirror, Read Port0x04, IN1
0x0001SpecialActive High
0x0002Start 2Active High
0x0004Start 1Active High
0x0008UnusedActive High
0x0010Button 1Active High
0x0020Joystick RightActive High
0x0040Joystick LeftActive High
0x0080UnusedActive Low
0x00011Writeinvad2ct_audio_3_w
0x00021Mirror, Read Port0x04, IN2
0x0003CoinageActive High
0x00022C_1CActive High
0x00032C_2CActive High
0x00001C_1CActive High
0x00011C_2CActive High
0x0004UnusedActive Low
0x0008CabinetActive High
0x0008UprightActive High
0x0000CocktailActive High
0x0010Button 1Active High
0x0020Joystick LeftActive High
0x0040Joystick RightActive High
0x0080Bonus_LifeActive High
0x00801500Active High
0x00002000Active High
0x00021Device Writemb14241, mb14241_device, shift_count_w
0x00031Mirror, Device Read0x04, mb14241, mb14241_device, shift_result_r
0x00031Writeinvad2ct_audio_1_w
0x00041Device Writemb14241, mb14241_device, shift_data_w
0x00051Writeinvad2ct_audio_2_w
0x00061Device Writewatchdog, watchdog_timer_device, reset_w
0x00071Writeinvad2ct_audio_4_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
0x0000-0x07FF2048invad2ct.hCRC(51d02a71) (Fluke: B4EA)
0x0800-0x0FFF2048invad2ct.gCRC(533ac770) (Fluke: DE6F)
0x1000-0x17FF2048invad2ct.fCRC(d1799f39) (Fluke: 1D0F)
0x1800-0x1FFF2048invad2ct.eCRC(291c1418) (Fluke: 6A54)
0x5000-0x57FF2048invad2ct.bCRC(8d9a07c4) (Fluke: 9BB9)
0x5800-0x5FFF2048invad2ct.aCRC(efdabb03) (Fluke: 9ABD)
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