diff --git a/BizHawk.Emulation.Cores/Computers/MSX/LibMSX.cs b/BizHawk.Emulation.Cores/Computers/MSX/LibMSX.cs
index 3137f4e5aa..648ddcc81d 100644
--- a/BizHawk.Emulation.Cores/Computers/MSX/LibMSX.cs
+++ b/BizHawk.Emulation.Cores/Computers/MSX/LibMSX.cs
@@ -6,7 +6,7 @@ using System.Text;
 namespace BizHawk.Emulation.Cores.Computers.MSX
 {
 	/// <summary>
-	/// static bindings into MSXHAWK.dll
+	/// static bindings into MSXHawk.dll
 	/// </summary>
 	public static class LibMSX
 	{
diff --git a/BizHawk.Emulation.Cores/Computers/MSX/MSX.IEmulator.cs b/BizHawk.Emulation.Cores/Computers/MSX/MSX.IEmulator.cs
index 821df02750..2331e539aa 100644
--- a/BizHawk.Emulation.Cores/Computers/MSX/MSX.IEmulator.cs
+++ b/BizHawk.Emulation.Cores/Computers/MSX/MSX.IEmulator.cs
@@ -157,10 +157,10 @@ namespace BizHawk.Emulation.Cores.Computers.MSX
 			return _vidbuffer;
 		}
 
-		public int VirtualWidth => 160;
-		public int VirtualHeight => 144;
-		public int BufferWidth => 160;
-		public int BufferHeight => 144;
+		public int VirtualWidth => 256;
+		public int VirtualHeight => 192;
+		public int BufferWidth => 256;
+		public int BufferHeight => 192;
 		public int BackgroundColor => unchecked((int)0xFF000000);
 		public int VsyncNumerator => _frameHz;
 		public int VsyncDenominator => 1;
diff --git a/BizHawk.Emulation.Cores/Computers/MSX/MSX.cs b/BizHawk.Emulation.Cores/Computers/MSX/MSX.cs
index 4f72453bae..f747c6afec 100644
--- a/BizHawk.Emulation.Cores/Computers/MSX/MSX.cs
+++ b/BizHawk.Emulation.Cores/Computers/MSX/MSX.cs
@@ -27,8 +27,6 @@ namespace BizHawk.Emulation.Cores.Computers.MSX
 				Array.Resize(ref RomData, ((RomData.Length / BankSize) + 1) * BankSize);
 			}
 
-			byte[] Bios = null;
-			byte[] Basic = null;
 			Bios = comm.CoreFileProvider.GetFirmware("MSX", "bios", true, "BIOS Not Found, Cannot Load");
 			Basic = comm.CoreFileProvider.GetFirmware("MSX", "basic", true, "BIOS Not Found, Cannot Load");
 
@@ -68,8 +66,8 @@ namespace BizHawk.Emulation.Cores.Computers.MSX
 
 		IntPtr MSX_Pntr { get; set; } = IntPtr.Zero;
 		byte[] MSX_core = new byte[0x20000];
-		public byte[] _bios;
-		public byte[] _basic;
+		public static byte[] Bios;
+		public static byte[] Basic;
 
 		// Constants
 		private const int BankSize = 16384;
diff --git a/libHawk/MSXHawk/MSXHawk/MSXHawk.cpp b/libHawk/MSXHawk/MSXHawk/MSXHawk.cpp
index a7753893df..e7432bbcfa 100644
--- a/libHawk/MSXHawk/MSXHawk/MSXHawk.cpp
+++ b/libHawk/MSXHawk/MSXHawk/MSXHawk.cpp
@@ -21,6 +21,10 @@ MSXHawk_EXPORT MSXCore* MSX_create()
 // free the memory from the core pointer
 MSXHawk_EXPORT void MSX_destroy(MSXCore* p)
 {
+	delete p->MemMap.bios_rom;
+	delete p->MemMap.basic_rom;
+	delete p->MemMap.rom_1;
+	delete p->MemMap.rom_2;
 	std::free(p);
 }
 
diff --git a/libHawk/MSXHawk/MSXHawk/Memory.h b/libHawk/MSXHawk/MSXHawk/Memory.h
index 83dbf9089b..f296ff7f23 100644
--- a/libHawk/MSXHawk/MSXHawk/Memory.h
+++ b/libHawk/MSXHawk/MSXHawk/Memory.h
@@ -52,18 +52,27 @@ namespace MSXHawk
 
 		void remap();
 
+		// NOTE: only called from source when both are available and of correct size (0x4000)
 		void Load_BIOS(uint8_t* bios, uint8_t* basic) 
 		{
-			bios_rom = bios;
-			basic_rom = basic;
+			bios_rom = new uint8_t[0x4000];
+			basic_rom = new uint8_t[0x4000];
+			
+			memcpy(bios_rom, bios, 0x4000);
+			memcpy(basic_rom, basic, 0x4000);
 		}
 
 		void Load_ROM(uint8_t* ext_rom_1, uint32_t ext_rom_size_1, uint32_t ext_rom_mapper_1, uint8_t* ext_rom_2, uint32_t ext_rom_size_2, uint32_t ext_rom_mapper_2)
 		{
-			rom_1 = ext_rom_1;
+			rom_1 = new uint8_t[ext_rom_size_1];
+			rom_2 = new uint8_t[ext_rom_size_2];
+
+			memcpy(rom_1, ext_rom_1, ext_rom_size_1);
+			memcpy(rom_2, ext_rom_2, ext_rom_size_2);
+
 			rom_size_1 = ext_rom_size_1 / 0x4000;
 			rom_mapper_1 = ext_rom_mapper_1;
-			rom_2 = ext_rom_2;
+
 			rom_size_2 = ext_rom_size_2 / 0x4000;
 			rom_mapper_2 = ext_rom_mapper_2;