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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.
Itazura Tenshi (Nichibutsu / Alice, 1984)
Memory Area:itaten_main_map
Address RangeLengthFunctionDescription
0x0000-0x9FFF40960ROM
0xA000-0xB7FF6144RAM
Memory Area:itaten_snd_io_map
Address RangeLengthFunctionDescription
0x00001Device Read/Writesoundlatch, generic_latch_8_device, read, clear_w
0x0086-0x00872Device Writeay1, ay8910_device, data_address_w
0x008A-0x008B2Device Writeay2, ay8910_device, data_address_w
0x008E-0x008F2Device Writeay3, ay8910_device, data_address_w
Memory Area:itaten_snd_map
Address RangeLengthFunctionDescription
0x0000-0x2FFF12288ROM
0xE000-0xE7FF2048RAM
Memory Area:main_io_map
Address RangeLengthFunctionDescription
0x00001Read PortP1
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x00011Read PortP2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x00021Read PortSYSTEM
0x0001Start 1Active Low
0x0002Start 2Active Low
0x0004Service 1Active Low
0x0010Coin 1Active Low
0x0020Coin 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0x00031Read PortDSWA
0x0003Coin_AActive High
0x00012C_1CActive High
0x00031C_1CActive High
0x00021C_2CActive High
0x0000Free_PlayActive High
0x000cCoin_BActive High
0x00003C_1CActive High
0x00042C_3CActive High
0x000c1C_3CActive High
0x00081C_6CActive High
0x00f0UnknownActive Low
0x00041Read PortDSWB
0x0003DifficultyActive High
0x0003EasyActive High
0x0002MediumActive High
0x0001HardActive High
0x0000HardestActive High
0x000cLivesActive High
0x000c3Active High
0x00084Active High
0x00045Active High
0x00006Active High
0x0030Bonus_LifeActive High
0x003030k then every 50kActive High
0x002060k then every 50kActive High
0x001030k then every 90kActive High
0x000060k then every 90kActive High
0x0040Demo_SoundsActive High
0x0040OffActive High
0x0000OnActive High
0x0080CabinetActive High
0x0000UprightActive High
0x0080CocktailActive High
0x00051Read NOP(// watchdog in itaten)
0x00201Writecoins_w
0x00211Writebg_bank_w
0x00221Writebg_scroll_x_w
0x00231Writebg_scroll_y_w
0x00241Writemain_irq_ack_w
0x00271Writesnd_w
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8800-0x97FF4096RAM
0xC000-0xC3FF1024Mirror, RAM Write, Shared0x400, background_w, bgvideoram
0xD000-0xD3FF1024RAM Write, Sharedforeground_w, fgvideoram
0xE000-0xE0FF256RAM, Sharedspriteram
Memory Area:snd_io_map
Address RangeLengthFunctionDescription
0x00001Device Read/Writesoundlatch, generic_latch_8_device, read, clear_w
0x00041Writemusic_irq_w
0x00081Writesnd_irq_w
0x000C1Writesnd_ack_w
0x00801Writeadpcm_w
0x0086-0x00872Device Writeay1, ay8910_device, data_address_w
0x008A-0x008B2Device Writeay2, ay8910_device, data_address_w
0x008E-0x008F2Device Writeay3, ay8910_device, data_address_w
Memory Area:snd_map
Address RangeLengthFunctionDescription
0x0000-0x5FFF24576ROM
0xD000-0xE7FF6144RAM
 

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
0x0000-0x1FFF81926.6gCRC(dfcb1a3e)
0x2000-0x2FFF40967.6hCRC(844e78d6)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819216.12jCRC(8af2bfb8)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819211.13aCRC(ed3279d5)
0x2000-0x3FFF819210.12aCRC(d2b60e5d)
0x4000-0x5FFF81929.11aCRC(919cac5e)
0x6000-0x7FFF81928.10aCRC(c32b0859)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF819213.2dCRC(d32559f5)
0x2000-0x3FFF819212.1dCRC(f0f64636)
0x4000-0x5FFF819214.3dCRC(8c532c74)
0x6000-0x7FFF819215.4dCRC(d119b483)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF81921.5kCRC(84c8a010)
0x2000-0x3FFF81922.5lCRC(19946038)
0x4000-0x5FFF81923.5mCRC(4f9e26fd)
0x6000-0x7FFF81924.1fCRC(35f85aeb)
0x8000-0x9FFF81925.1eCRC(6cf30924)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32af-3.13dCRC(875429ba)
0x0020-0x003F32af-2.1hCRC(e1cac297)
0x0040-0x005F32af-1.3nCRC(5638e485)
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