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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.
Satan of Saturn (SNK, 1981)
Memory Area:sasuke_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x0400-0x07FF1024RAM Write, Sharedvideoram2_w, videoram2
0x0800-0x0BFF1024RAM Write, Sharedvideoram_w, videoram
0x0C00-0x0FFF1024RAM Write, Sharedcolorram_w, colorram
0x1000-0x1FFF4096RAM Write, Sharedcharram_w, charram
0x30001Device Writecrtc, mc6845_device, address_w
0x30011Device Writecrtc, mc6845_device, register_w
0x4000-0x8FFF20480ROM
0xB000-0xB0012Device Writesnk6502, snk6502_sound_device, sasuke_sound_w
0xB0021Writesatansat_b002_w (/* flip screen & irq enable */)
0xB0031Writesatansat_backcolor_w
0xB0041Read PortIN0
0x0001Joystick LeftActive High
0x0002Joystick RightActive High
0x0004Button 1Active High
0x0008Joystick LeftActive High
0x0010Joystick RightActive High
0x0020Button 1Active High
0x0040Button 2Active High
0x0080Button 2Active High
0xB0051Read PortIN1
0x0001Start 1Active High
0x0002Start 2Active High
0x007cUnknownActive High
0x0080SpecialActive High
0xB0061Read PortDSW
0x0001CabinetActive High
0x0001UprightActive High
0x0000CocktailActive High
0x000aCoinageActive High
0x0004Bonus_LifeActive High
0x0030LivesActive High
0x00303Active High
0xB0071Read PortIN2
0x0001Coin 1Active High
0x000eUnknownActive High
0x00f0SpecialActive High
0xF800-0xFFFF2048ROM
Memory Area:satansat_map
Address RangeLengthFunctionDescription
0x0000-0x03FF1024RAM
0x0400-0x07FF1024RAM Write, Sharedvideoram2_w, videoram2
0x0800-0x0BFF1024RAM Write, Sharedvideoram_w, videoram
0x0C00-0x0FFF1024RAM Write, Sharedcolorram_w, colorram
0x1000-0x1FFF4096RAM Write, Sharedcharram_w, charram
0x30001Device Writecrtc, mc6845_device, address_w
0x30011Device Writecrtc, mc6845_device, register_w
0x4000-0x9FFF24576ROM
0xB000-0xB0012Device Writesnk6502, snk6502_sound_device, satansat_sound_w
0xB0021Writesatansat_b002_w (/* flip screen & irq enable */)
0xB0031Writesatansat_backcolor_w
0xB0041Read PortIN0
0x0001Joystick LeftActive High
0x0002Joystick RightActive High
0x0004Button 1Active High
0x0008Joystick LeftActive High
0x0010Joystick RightActive High
0x0020Button 1Active High
0x0040Button 2Active High
0x0080Button 2Active High
0xB0051Read PortIN1
0x0001Start 1Active High
0x0002Start 2Active High
0x007cUnknownActive High
0x0080SpecialActive High
0xB0061Read PortDSW
0x0001CabinetActive High
0x0001UprightActive High
0x0000CocktailActive High
0x000aCoinageActive High
0x0004Bonus_LifeActive High
0x0030LivesActive High
0x00303Active High
0xB0071Read PortIN2
0x0001Coin 1Active High
0x000eUnknownActive High
0x00f0SpecialActive High
0xF800-0xFFFF2048ROM
 

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:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048zarz135.73CRC(e837c62b) (Fluke: BF0D)
0x0800-0x0FFF2048zarz136.75CRC(83f61623) (Fluke: F5D7)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x4000-0x47FF2048ss1CRC(549dd13a) (Fluke: 6C8C)
0x4800-0x4FFF2048ss2CRC(04972fa8) (Fluke: C886)
0x5000-0x57FF2048ss3CRC(9caf9057) (Fluke: 2C8F)
0x5800-0x5FFF2048ss4CRC(e1bdcfe1) (Fluke: 10C9)
0x6000-0x67FF2048ss5CRC(d454de19) (Fluke: F002)
0x6800-0x6FFF2048ss6CRC(7fbd5d30) (Fluke: AF1C)
0x7000-0x77FF2048zarz128.15CRC(93ea2df9) (Fluke: CA27)
0x7800-0x7FFF2048zarz129.16CRC(e67ec873) (Fluke: 6178)
0x8000-0x87FF2048zarz130.22CRC(22c44650) (Fluke: 8F45)
0x8800-0x8FFF2048ss10CRC(8f1b313a) (Fluke: FD81)
0x9000-0x97FF2048ss11CRC(e74f98e0) (Fluke: 5113)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0000-0x001F32zarz138.03CRC(5dd6933a) (Fluke: 323E)
0x0000-0x001F32zarz138.03CRC(5dd6933a) (Fluke: 323E)
Memory Area:snk6502
Address RangeLengthLabel/LocationDescription
0x0000-0x07FF2048ss12CRC(dee01f24) (Fluke: DDE2)
0x0800-0x0FFF2048zarz134.54CRC(580934d2) (Fluke: ED76)
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