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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.
U.S. Championship V'ball (Technos Japan, 1988)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x07FF2048RAM
0x0800-0x08FF256RAM, Sharedspriteram
0x10001Read PortP1
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080Start 1Active Low
0x10011Read PortP2
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080Start 2Active Low
0x10021Read PortSYSTEM
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Service 1Active Low
0x0008CustomActive High
0x0010UnusedActive Low
0x0020UnusedActive Low
0x0040UnusedActive Low
0x0080UnusedActive Low
0x10031Read PortDSW1
0x0003DifficultyActive High
0x0002EasyActive High
0x0003MediumActive High
0x0001HardActive High
0x0000Very_HardActive High
0x00001:15Active High
0x00041:30Active High
0x000c1:45Active High
0x00082:00Active High
0x0000NormalActive High
0x0020Button AActive High
0x0010Button BActive High
0x0030NormalActive High
0x0040NormalActive High
0x0000Rotate 90Active High
0x00802 PlayersActive High
0x00004 PlayersActive High
0x10041Read PortDSW2
0x0007Coin_AActive High
0x00004C_1CActive High
0x00013C_1CActive High
0x00022C_1CActive High
0x00071C_1CActive High
0x00061C_2CActive High
0x00051C_3CActive High
0x00041C_4CActive High
0x00031C_5CActive High
0x0038Coin_BActive High
0x00004C_1CActive High
0x00083C_1CActive High
0x00102C_1CActive High
0x00381C_1CActive High
0x00301C_2CActive High
0x00281C_3CActive High
0x00201C_4CActive High
0x00181C_5CActive High
0x0040Flip_ScreenActive High
0x0000OffActive High
0x0040OnActive High
0x0080Demo_SoundsActive High
0x0000OffActive High
0x0080OnActive High
0x10051Read PortP3
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080Start 3Active Low
0x10061Read PortP4
0x0001Joystick RightActive Low
0x0002Joystick LeftActive Low
0x0004Joystick UpActive Low
0x0008Joystick DownActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080Start 4Active Low
0x10081Writescrollx_hi_w
0x10091Writebankswitch_w
0x100A-0x100B2Writeirq_ack_w (/* is there a scanline counter here? */)
0x100C1Writescrollx_lo_w
0x100D1Writecpu_sound_command_w
0x100E1Write Only, Sharedscrolly_lo
0x2000-0x2FFF4096Write, Sharedvideoram_w, videoram
0x3000-0x3FFF4096Write, Sharedattrib_w, attribram
0x4000-0x7FFF16384ROM Bankmainbank
0x8000-0xFFFF32768ROM
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x7FFF32768ROM
0x8000-0x87FF2048RAM
0x8800-0x88012Device Read/Writeymsnd, ym2151_device, read, write
0x9800-0x98034Device Read/Writeoki, okim6295_device, read, write
0xA0001Device Readsoundlatch, generic_latch_8_device, read
 

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:fg_tiles
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288trj-101.96CRC(f343eee4) (Fluke: 8019)
0x0000-0x7FFFF524288trj-101.96CRC(f343eee4) (Fluke: 8019)
Memory Area:maincpu
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFF3276825j1-0.47CRC(10ca79ad) (Fluke: 9495)
0x0000-0x7FFF3276825j1-0.47CRC(10ca79ad) (Fluke: 9495)
Memory Area:oki
Address RangeLengthLabel/LocationDescription
0x0000-0x1FFFF13107225j0-0.78CRC(8e04bdbf) (Fluke: BE96)
0x0000-0x1FFFF13107225j0-0.78CRC(8e04bdbf) (Fluke: BE96)
Memory Area:proms
Address RangeLengthLabel/LocationDescription
0x0800-0x0FFF204825j7-0.160CRC(2ffb68b3) (Fluke: 2097)
0x0800-0x0FFF204825j7-0.160CRC(2ffb68b3) (Fluke: 2097)
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