Memory Area:gfx2
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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.
G-Stream G2020 (Oriental Soft Japan, 2002)
Memory Area:gstream_32bit_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFFF4194304RAM, Sharedworkram (// work ram)
0x4E000000-0x4E1FFFFF2097152ROM, Regionuser2,0 (// main game rom)
0x4F000000-0x4F0000034Writegstream_tilemap3_scrollx_w
0x4F200000-0x4F2000034Writegstream_tilemap3_scrolly_w
0x4F400000-0x4F406FFF28672RAM Device Write, Sharedpalette, palette_device, write, palette
0x4F800000-0x4F8000034Writegstream_tilemap1_scrollx_w
0x4FA00000-0x4FA000034Writegstream_tilemap1_scrolly_w
0x4FC00000-0x4FC000034Writegstream_tilemap2_scrollx_w
0x4FE00000-0x4FE000034Writegstream_tilemap2_scrolly_w
0x80000000-0x80003FFF16384RAM Write, Sharedgstream_vram_w, vram (// video ram)
0xFFC00000-0xFFC01FFF8192RAM, Sharednvram (// Backup RAM)
0xFFF80000-0xFFFFFFFF524288ROM, Regionuser1,0 (// boot rom)
Memory Area:gstream_io
Address RangeLengthFunctionDescription
0x4000-0x40034Read PortIN0
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Button 4Active Low
0x0100UnusedActive Low
0x0200Coin 1Active Low
0x0400Start 1Active Low
0x0800Service 1Active Low
0x7000UnusedActive Low
0x4010-0x40134Read PortIN1
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040Button 3Active Low
0x0080Button 4Active Low
0x0100UnusedActive Low
0x0200Coin 2Active Low
0x0400Start 2Active Low
0x0800Service 2Active Low
0x7000UnusedActive Low
0x8000SpecialActive Low
0x4020-0x40234Read PortIN2 (// extra coin switches etc)
0x004fSpecialActive Low
0xffb0UnusedActive Low
0x4030-0x40334Writegstream_oki_banking_w (// oki banking)
0x4040-0x40434Writegstream_oki_4040_w (// some clocking?)
0x4050-0x40534Device Read/Write 8-bitoki1, okim6295_device, read, write, 0x000000ff (// music and samples)
0x4060-0x40634Device Read/Write 8-bitoki2, okim6295_device, read, write, 0x000000ff (// music and samples)
 

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.   
0x0000-0x7FFFF524288gs_prg_01.u56CRC(0d0c6a38) (Fluke: 6636)
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152gs_gr_01.u120CRC(b82cfab8) (Fluke: 5483)
0x200000-0x3FFFFF2097152gs_gr_02.u121CRC(37e19cbd) (Fluke: C9B2)
Memory Area:gfx3
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152gs_gr_03.u125CRC(1a3b2b11) (Fluke: 29B3)
0x200000-0x3FFFFF2097152gs_gr_04.u126CRC(a4e8906c) (Fluke: 9E15)
Memory Area:gfx4
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFFF2097152gs_gr_05.u174CRC(ef283a73) (Fluke: A90B)
0x200000-0x3FFFFF2097152gs_gr_06.u175CRC(d4e3a2b2) (Fluke: C840)
Memory Area:nvram
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFF8192gstream.nvCRC(895d724b)
Memory Area:oki1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288gs_snd_01.u192CRC(79b64d3f) (Fluke: CA3C)
0x80000-0xFFFFF524288gs_snd_02.u194CRC(e49ed92c) (Fluke: 566D)
Memory Area:oki2
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288gs_snd_03.u191CRC(2bfff4ac) (Fluke: 9F7D)
0x80000-0xFFFFF524288gs_snd_04.u193CRC(b259de3b) (Fluke: AD99)
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