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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.
Welltris (Video System Co., 1991)
Memory Area:main_map
Address RangeLengthFunctionDescription
0x0000-0x3FFFF262144ROM
0x100000-0x17FFFF524288ROM
0x800000-0x81FFFF131072RAM, Sharedpixelram (/* Graph_1 & 2*/)
0xFF8000-0xFFBFFF16384RAM(/* work */)
0xFFC000-0xFFC3FF1024RAM, Sharedspriteram (/* Sprite */)
0xFFD000-0xFFDFFF4096RAM Write, Sharedcharvideoram_w, charvideoram (/* Char */)
0xFFE000-0xFFEFFF4096RAM Device Write, Sharedpalette, palette_device, write, palette (/* Palette */)
0xFFF000-0xFFF0012Read PortP1 (/* Bottom Controls */)
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xFFF000-0xFFF0012Writepalette_bank_w
0xFFF002-0xFFF0032Read PortP2 (/* Top Controls */)
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xFFF002-0xFFF0032Writegfxbank_w
0xFFF004-0xFFF0052Read PortP3 (/* Left Side Ctrls */)
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xFFF004-0xFFF0074Writescrollreg_w
0xFFF006-0xFFF0072Read PortP4 (/* Right Side Ctrls */)
0x0001Joystick UpActive Low
0x0002Joystick DownActive Low
0x0004Joystick LeftActive Low
0x0008Joystick RightActive Low
0x0010Button 1Active Low
0x0020Button 2Active Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xFFF008-0xFFF0092Read PortSYSTEM (/* Bit 5 Tested at start of irq 1 */)
0x0001Coin 1Active Low
0x0002Coin 2Active Low
0x0004Start 1Active Low
0x0008Start 2Active Low
0x0010Service 2Active Low
0x0020TiltActive Low
0x0040Service 1Active Low
0x0080SpecialActive High
0xFFF008-0xFFF0092Writesound_command_w
0xFFF00A-0xFFF00B2Read PortEXTRA (/* P3+P4 Coin + Start Buttons */)
0x0001Coin 3Active Low
0x0002Coin 4Active Low
0x0004Start 3Active Low
0x0008Start 4Active Low
0x0004UnknownActive Low
0x0008UnknownActive Low
0x0010UnknownActive Low
0x0020UnknownActive Low
0x0040UnknownActive Low
0x0080UnknownActive Low
0xFFF00C-0xFFF00D2Read PortDSW1
0x00065C_1CActive High
0x00074C_1CActive High
0x00083C_1CActive High
0x00092C_1CActive High
0x00042-1, 4-2, 5-3, 6-4Active High
0x00032-1, 4-3Active High
0x000f1C_1CActive High
0x00011-1, 2-2, 3-3, 4-5Active High
0x00021-1, 2-2, 3-3, 4-4, 5-6Active High
0x00001-1, 2-3Active High
0x00052C_3CActive High
0x000e1C_2CActive High
0x000d1C_3CActive High
0x000c1C_4CActive High
0x000b1C_5CActive High
0x000a1C_6CActive High
0x00605C_1CActive High
0x00704C_1CActive High
0x00803C_1CActive High
0x00902C_1CActive High
0x00402-1, 4-2, 5-3, 6-4Active High
0x00302-1, 4-3Active High
0x00f01C_1CActive High
0x00101-1, 2-2, 3-3, 4-5Active High
0x00201-1, 2-2, 3-3, 4-4, 5-6Active High
0x00001-1, 2-3Active High
0x00502C_3CActive High
0x00e01C_2CActive High
0x00d01C_3CActive High
0x00c01C_4CActive High
0x00b01C_5CActive High
0x00a01C_6CActive High
0xFFF00C-0xFFF00D2Write NOP(/* ?? */)
0xFFF00E-0xFFF00F2Write NOP(/* ?? */)
0xFFF00E-0xFFF00F2Read PortDSW2
0x0002EasyActive High
0x0003NormalActive High
0x0001HardActive High
0x0000HardestActive High
0x0004Mono PlayerActive High
0x0000Many PlayerActive High
0x0000OffActive High
0x0008OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0010OffActive High
0x0000OnActive High
0x0020OffActive High
0x0000OnActive High
0x0040OffActive High
0x0000OnActive High
Memory Area:sound_map
Address RangeLengthFunctionDescription
0x0000-0x77FF30720ROM
0x7800-0x7FFF2048RAM
0x8000-0xFFFF32768ROM Banksoundbank
 

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
0x0000-0x1FFFF1310723.144CRC(ae8f763e) (Fluke: 60F8)
0x0000-0x1FFFF1310723.144CRC(ae8f763e) (Fluke: 60F8)
Memory Area:gfx1
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288lh534j12.77CRC(b61a8b74) (Fluke: 244E)
0x0000-0x7FFFF524288lh534j12.77CRC(b61a8b74) (Fluke: 244E)
Memory Area:gfx2
Address RangeLengthLabel/LocationDescription
0x0000-0x3FFFF262144046.93CRC(31d96d77) (Fluke: 9575)
0x0000-0x3FFFF262144046.93CRC(31d96d77) (Fluke: 9575)
0x40000-0x7FFFF262144048.94CRC(bb4643da) (Fluke: 8294)
0x40000-0x7FFFF262144048.94CRC(bb4643da) (Fluke: 8294)
Memory Area:ymsnd
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288lh534j09.123CRC(6c2ce9a5) (Fluke: AC6B)
0x0000-0x7FFFF524288lh534j09.123CRC(6c2ce9a5) (Fluke: AC6B)
0x80000-0xFFFFF524288lh534j10.124CRC(e3682221) (Fluke: C1C9)
0x80000-0xFFFFF524288lh534j10.124CRC(e3682221) (Fluke: C1C9)
Memory Area:ymsnd.deltat
Address RangeLengthLabel/LocationDescription
0x0000-0x7FFFF524288lh534j11.126CRC(bf85fb0d) (Fluke: 8EF7)
0x0000-0x7FFFF524288lh534j11.126CRC(bf85fb0d) (Fluke: 8EF7)
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