Fix VRAM lookup

src/BizHawk.Emulation.Cores/Consoles/Watara/SuperVision/ASIC.cs

@@ -184,9 +184,6 @@ namespace BizHawk.Emulation.Cores.Consoles.SuperVision
 						{
 							_vramStartAddress = 0;
 						}
-
-						// setup for the next scanline
-						_vramPointer = _vramStartAddress + (_regs[R_X_SCROLL] >> 2);
 					}					
 				}
 			}

src/BizHawk.Emulation.Cores/Consoles/Watara/SuperVision/Memory.cs

@@ -143,7 +143,7 @@ namespace BizHawk.Emulation.Cores.Consoles.SuperVision
 		/// </summary>
 		public byte ReadVRAM(ushort address)
 		{
-			return VRAM[address & 0x0FFF];
+			return VRAM[address & 0x1FFF];
 		}
 	}
 }