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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.
Snow Bros. - Nick & Tom (Toaplan, 1990)
Memory Area:snowbros_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x100000-0x103FFF16384RAM
0x200000-0x2000012Device Writewatchdog, watchdog_timer_device, reset16_w
0x300000-0x3000012Read/Writesnowbros_68000_sound_r,snowbros_68000_sound_w
0x400000-0x4000012Writesnowbros_flipscreen_w
0x500000-0x5000012Read PortDSW1
0x0001RegionActive High
0x0000EuropeActive High
0x0001America (Romstar license)Active High
0x0002Flip_ScreenActive High
0x0002OffActive High
0x0000OnActive High
0x0008Demo_SoundsActive High
0x0000OffActive High
0x0008OnActive High
0x0030Coin_AActive High
0x00004C_1CActive High
0x00103C_1CActive High
0x00202C_1CActive High
0x00102C_1CActive High
0x00301C_1CActive High
0x00002C_3CActive High
0x00201C_2CActive High
0x00c0Coin_BActive High
0x00402C_1CActive High
0x00c01C_1CActive High
0x00002C_3CActive High
0x00801C_2CActive High
0x00c01C_2CActive High
0x00801C_3CActive High
0x00401C_4CActive High
0x00001C_6CActive High
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000UnknownActive High
0x500002-0x5000032Read PortDSW2
0x0003DifficultyActive High
0x0002EasyActive High
0x0003NormalActive High
0x0001HardActive High
0x0000HardestActive High
0x000cBonus_LifeActive High
0x0004100k and every 200kActive High
0x000c100k OnlyActive High
0x0008200k OnlyActive High
0x0000NoneActive High
0x0030LivesActive High
0x00201Active High
0x00002Active High
0x00303Active High
0x00104Active High
0x0040OffActive High
0x0000OnActive High
0x0080Allow_ContinueActive High
0x0000NoActive High
0x0080YesActive High
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000Button 3Active Low
0x8000UnknownActive High
0x500004-0x5000052Read PortSYSTEM
0x0100Start 1Active Low
0x0200Start 2Active Low
0x0400Coin 1Active Low
0x0800Coin 2Active Low
0x1000UnknownActive Low
0x2000TiltActive Low
0x4000Coin 3Active Low
0x8000UnknownActive Low
0x600000-0x6001FF512RAM Device Write, Sharedpalette, palette_device, write, palette
0x700000-0x701FFF8192Device Read/Writepandora, kaneko_pandora_device, spriteram_LSB_r, spriteram_LSB_w
0x800000-0x8000012Writesnowbros_irq4_ack_w (/* IRQ 4 acknowledge */)
0x900000-0x9000012Writesnowbros_irq3_ack_w (/* IRQ 3 acknowledge */)
0xA00000-0xA000012Writesnowbros_irq2_ack_w (/* IRQ 2 acknowledge */)
Memory Area:sound_io_map
Address RangeLengthFunctionDescription
0x0002-0x00032Device Read/Writeymsnd, ym3812_device, read, write
0x00041Device Read/Writesoundlatch, generic_latch_8_device, read, write (/* goes back to the main CPU, checked during boot */)
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
 

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
0x0000-0x7FFFF524288sbros-1.41CRC(16f06b3a) (Fluke: AFA0)
0x0000-0x7FFFF524288sbros-1.41CRC(16f06b3a) (Fluke: AFA0)
0x0000-0x7FFFF524288sbros-1.41CRC(16f06b3a) (Fluke: AFA0)
0x0000-0x7FFFF524288sbros-1.41CRC(16f06b3a) (Fluke: AFA0)
0x0000-0x7FFFF524288sbros-1.41CRC(16f06b3a) (Fluke: AFA0)
Memory Area:soundcpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF32768sbros-4.29CRC(e6eab4e4) (Fluke: A374)
0x0000-0x7FFF32768sbros-4.29CRC(e6eab4e4) (Fluke: A374)
0x0000-0x7FFF32768sbros-4.29CRC(e6eab4e4) (Fluke: A374)
0x0000-0x7FFF32768sbros-4.29CRC(e6eab4e4) (Fluke: A374)
0x0000-0x7FFF32768sbros-4.29CRC(e6eab4e4) (Fluke: A374)
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