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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.
Cross Pang (F2 System, 1998)
Memory Area:crospang_base_map
Address RangeLengthFunctionDescription
0x0000-0xFFFFF1048576ROM, Write NOP(// writes to rom quite often)
0x120000-0x1207FF2048RAM Write, Sharedcrospang_fg_videoram_w, fg_videoram
0x122000-0x1227FF2048RAM Write, Sharedcrospang_bg_videoram_w, bg_videoram
0x200000-0x2005FF1536RAM Device Write, Sharedpalette, palette_device, write, palette
0x210000-0x2107FF2048RAM, Sharedspriteram
0x270000-0x2700012Writecrospang_soundlatch_w
0x270004-0x2700074Write NOP(// ??)
0x280000-0x2800012Read PortP1_P2
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080Start 1Active Low
0x0100Joystick UpActive Low
0x0200Joystick DownActive Low
0x0400Joystick LeftActive Low
0x0800Joystick RightActive Low
0x1000Button 1Active Low
0x2000Button 2Active Low
0x4000UnknownActive Low
0x8000Start 2Active Low
0x280002-0x2800032Read PortCOIN
0x00ffUnknownActive Low
0x0100Coin 1Active Low
0x0200Coin 2Active Low
0xfc00UnknownActive Low
0x280004-0x2800052Read PortDSW
0x0003CoinageActive High
0x00003C_1CActive High
0x00012C_1CActive High
0x00021C_1CActive High
0x00031C_2CActive High
0x000cDifficultyActive High
0x0008EasyActive High
0x000cMediumActive High
0x0000HardActive High
0x0004HardestActive High
0x00105k 20k 15k+Active High
0x00008k 23k 15k+Active High
0x00001Active High
0x00202Active High
0x00c01Active High
0x00802Active High
0x00403Active High
0x00004Active High
0x0300UnknownActive High
0x03006/7Active High
0x02007/8Active High
0x01008/9Active High
0x00009/10Active High
0x04003 Chain ReactionsActive High
0x00004 Chain ReactionsActive High
0x18003Active High
0x10004Active High
0x08005Active High
0x00006Active High
Memory Area:crospang_map
Address RangeLengthFunctionDescription
0x100000-0x1000012Write NOP
0x100002-0x1000032Writecrospang_fg_scrolly_w
0x100004-0x1000052Writecrospang_bg_scrollx_w
0x100006-0x1000072Writecrospang_bg_scrolly_w
0x100008-0x1000092Writecrospang_fg_scrollx_w
0x10000E-0x10000F2Write NOP
0x320000-0x32FFFF65536RAM
Memory Area:crospang_sound_io_map
Address RangeLengthFunctionDescription
0x0000-0x00012Device Read/Writeymsnd, ym3812_device, read, write
0x00021Device Read/Writeoki, okim6295_device, read, write
0x00061Device Readsoundlatch, generic_latch_8_device, read
Memory Area:crospang_sound_map
Address RangeLengthFunctionDescription
0x0000-0xBFFF49152ROM
0xC000-0xC7FF2048RAM
 

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
0x0000-0xFFFF65536s1.binCRC(d61a224c) (Fluke: C922)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF131072s2.binCRC(9f9ecd22) (Fluke: 7756)
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