-Loaded EROM / GROM.

-Fixed disassembly for JMP:
--Now it uses the parameter pc, not RegisterPC.
--I was loading both the second and third value from the second's address.
--Casting the calculated addresses to bytes when addresses are 16-bit was a bad idea.
--Removed a closing parenthesis I accidentally stuck in the formatting.

It seems that I've gotten far enough to use the Executive ROM as a test case! Now to go instruction by instruction and see if they work as planned and hope this will all eventually make something.

BizHawk.Emulation/CPUs/CP1610/Disassembler.cs

@@ -15,7 +15,7 @@ namespace BizHawk.Emulation.CPUs.CP1610
 			byte register;
 			int second, third, op1, op2;
 			string result = "";
-			int opcode = ReadMemory(RegisterPC) & 0x3FF;
+			int opcode = ReadMemory(pc) & 0x3FF;
 			switch (opcode)
 			{
 				case 0x000:
@@ -28,8 +28,8 @@ namespace BizHawk.Emulation.CPUs.CP1610
 					return "DIS";
 				case 0x004:
 					// 0000:0000:0000:0100    0000:00rr:aaaa:aaff    0000:00aa:aaaa:aaaa
-					second = ReadMemory((byte)(RegisterPC + 1));
-					third = ReadMemory((byte)(RegisterPC + 1));
+					second = ReadMemory((ushort)(pc + 1));
+					third = ReadMemory((ushort)(pc + 2));
 					// rr indicates the register into which to store the return address
 					register = (byte)(((second >> 8) & 0x3) + 4);
 					// ff indicates how to affect the Interrupt (I) flag in the CP1610
@@ -53,7 +53,7 @@ namespace BizHawk.Emulation.CPUs.CP1610
 					}
 					if (register != 0x3)
 						result += " R" + register + ",";
-					result += string.Format(" ${0:X4})", op2);
+					result += string.Format(" ${0:X4}", op2);
 					bytesToAdvance = 3;
 					return result;
 				case 0x005:

BizHawk.Emulation/Consoles/Intellivision/Intellivision.cs

@@ -12,10 +12,36 @@ namespace BizHawk.Emulation.Consoles.Intellivision
 
 		CP1610 Cpu;
 
+		public void LoadExecutive_ROM()
+		{
+			FileStream fs = new FileStream("C:/erom.int", FileMode.Open, FileAccess.Read);
+			BinaryReader r = new BinaryReader(fs);
+			byte[] erom = r.ReadBytes(8192);
+			int index = 0;
+			// Combine every two bytes into a word.
+			while (index + 1 < erom.Length)
+				Executive_ROM[index / 2] = (ushort)((erom[index++] << 8) | erom[index++]);
+			r.Close();
+			fs.Close();
+		}
+
+		public void LoadGraphics_ROM()
+		{
+			FileStream fs = new FileStream("C:/grom.int", FileMode.Open, FileAccess.Read);
+			BinaryReader r = new BinaryReader(fs);
+			byte[] grom = r.ReadBytes(2048);
+			for (int index = 0; index < grom.Length; index++)
+				Graphics_ROM[index] = grom[index];
+			r.Close();
+			fs.Close();
+		}
+
 		public Intellivision(GameInfo game, byte[] rom)
 		{
 			Rom = rom;
 			Game = game;
+			LoadExecutive_ROM();
+			LoadGraphics_ROM();
 			Parse();
 
 			Cpu = new CP1610();