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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.
Ikari III - The Rescue (SNK, 1989)
Memory Area:pow_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x40000-0x43FFF16384RAM
0x80000-0x800012Writesound_w
0x80000-0x800012Readcontrol_1_r
0xC0000-0xC00012Writepow_flipscreen_w (// + char bank)
0xC0000-0xC00012Read PortSYSTEM
0x0001Service 1Active Low
0x0002ServiceActive Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010Coin 1Active Low
0x0020Coin 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xE0000-0xE00012Read NOP(/* Watchdog or IRQ ack */)
0xE8000-0xE80012Read NOP(/* Watchdog or IRQ ack */)
0xF0000-0xF00012Read PortDSW1
0x00ffUnusedActive Low
0x0300LivesActive High
0x02002Active High
0x00003Active High
0x01004Active High
0x03005Active High
0x0800First 2 Coins/1 Credit then 1/1Active High
0x00001C_1CActive High
0x0400First 1 Coin/2 Credits then 1/1Active High
0x0c00Free_PlayActive High
0x1000UnknownActive High
0x0000OffActive High
0x1000OnActive High
0x00001st & 2nd onlyActive High
0x20001st & every 2ndActive High
0x4000OffActive High
0x0000OnActive High
0x8000Flip_ScreenActive High
0x0000OffActive High
0x8000OnActive High
0xF0008-0xF00092Read PortDSW2
0x00ffUnusedActive Low
0x0200Allow_ContinueActive High
0x0200NoActive High
0x0000YesActive High
0x0c00Bonus_LifeActive High
0x000020k 50kActive High
0x080040k 100kActive High
0x040060k 150kActive High
0x0c00NoneActive High
0x2000Demo Sounds OffActive High
0x0000Demo Sounds OnActive High
0x3000FreezeActive High
0x1000Infinite Lives (Cheat)Active High
0xc000DifficultyActive High
0x0000EasyActive High
0x8000NormalActive High
0x4000HardActive High
0xc000HardestActive High
0x100000-0x100FFF4096Read/Write, Mirror, Sharedpow_fg_videoram_r, pow_fg_videoram_w, 0x1000, pow_fg_videoram (// 8-bit)
0x200000-0x207FFF32768Device Read/Write, Sharedsprites, snk68_spr_device, spriteram_r, spriteram_w, spriteram (// only partially populated)
0x400000-0x400FFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
Memory Area:searchar_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x40000-0x43FFF16384RAM
0x80000-0x800012Writesound_w
0x80000-0x800056Readprotcontrols_r (/* Player 1 & 2 */)
0x80006-0x800072Writeprotection_w (/* top byte unknown, bottom is protection in ikari3 and streetsm */)
0xC0000-0xC00012Writesearchar_flipscreen_w
0xC0000-0xC00012Readrotary_1_r (/* Player 1 rotary */)
0xC8000-0xC80012Readrotary_2_r (/* Player 2 rotary */)
0xD0000-0xD00012Readrotary_lsb_r (/* Extra rotary bits */)
0xE0000-0xE00012Read NOP(/* Watchdog or IRQ ack */)
0xE8000-0xE80012Read NOP(/* Watchdog or IRQ ack */)
0xF0000-0xF00012Read PortDSW1
0x00ffUnusedActive Low
0x0300LivesActive High
0x02002Active High
0x00003Active High
0x01004Active High
0x03005Active High
0x0800First 2 Coins/1 Credit then 1/1Active High
0x00001C_1CActive High
0x0400First 1 Coin/2 Credits then 1/1Active High
0x0c00Free_PlayActive High
0x1000UnknownActive High
0x0000OffActive High
0x1000OnActive High
0x00001st & 2nd onlyActive High
0x20001st & every 2ndActive High
0x4000OffActive High
0x0000OnActive High
0x8000Flip_ScreenActive High
0x0000OffActive High
0x8000OnActive High
0xF0008-0xF00092Read PortDSW2
0x00ffUnusedActive Low
0x0200Allow_ContinueActive High
0x0200NoActive High
0x0000YesActive High
0x0c00Bonus_LifeActive High
0x000020k 50kActive High
0x080040k 100kActive High
0x040060k 150kActive High
0x0c00NoneActive High
0x2000Demo Sounds OffActive High
0x0000Demo Sounds OnActive High
0x3000FreezeActive High
0x1000Infinite Lives (Cheat)Active High
0xc000DifficultyActive High
0x0000EasyActive High
0x8000NormalActive High
0x4000HardActive High
0xc000HardestActive High
0xF8000-0xF80012Device Read 8-bitsoundlatch2, generic_latch_8_device, read, 0xff00
0x100000-0x107FFF32768Device Read/Write, Sharedsprites, snk68_spr_device, spriteram_r, spriteram_w, spriteram (// only partially populated)
0x200000-0x200FFF4096RAM Write, Mirror, Sharedsearchar_fg_videoram_w, 0x1000, pow_fg_videoram (/* Mirror is used by Ikari 3 */)
0x300000-0x33FFFF262144ROM, Regionuser1, 0 (/* Extra code bank */)
0x400000-0x400FFF4096RAM Device Write, Sharedpalette, palette_device, write, palette
Memory Area:sound_io_map
Address RangeLengthFunctionDescription
0x00001Device Read/Writeymsnd, ym3812_device, status_port_r, control_port_w
0x00201Device Writeymsnd, ym3812_device, write_port_w
0x00401WriteD7759_write_port_0_w
0x00801WriteD7759_upd_reset_w
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0xEFFF61440ROM
0xF000-0xF7FF2048RAM
0xF8001Device Read, Device Writesoundlatch, generic_latch_8_device, read, soundlatch2, generic_latch_8_device, write
 

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
0x0000-0x7FFF32768ik3-7.16lCRC(0b4804df) (Fluke: BEAF)
0x0000-0x7FFF32768ik3-7.16lCRC(0b4804df) (Fluke: BEAF)
0x8000-0xFFFF32768ik3-8.16mCRC(10ab4e50) (Fluke: C489)
0x8000-0xFFFF32768ik3-8.16mCRC(10ab4e50) (Fluke: C489)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0xFFFF65536ik3-5.16dCRC(ce6706fc) (Fluke: CC30)
Memory Area:upd
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072ik3-6.18eCRC(59d256a4) (Fluke: D882)
0x0000-0x1FFFF131072ik3-6.18eCRC(59d256a4) (Fluke: D882)
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