diff --git a/SVM/Instructions/CALL.cs b/SVM/Instructions/CALL.cs
index af0dd03..e0965da 100644
--- a/SVM/Instructions/CALL.cs
+++ b/SVM/Instructions/CALL.cs
@@ -44,7 +44,8 @@ namespace SVM.Instructions
             Debug.Assert(vm.SP < VM.STACKDEPTH);
 
             vm.STACK[vm.SP++] = vm.PC;
-            vm.PC = (ushort)((vars[0] << 8) + vars[1]);
+            var jmp = (ushort)((vars[0] << 8) + vars[1]);
+            vm.PC = jmp;
         }
 
         public override string ToASM(byte[] vars)
diff --git a/SVM/Instructions/MUL.cs b/SVM/Instructions/MUL.cs
index a6f18e5..23a00a7 100644
--- a/SVM/Instructions/MUL.cs
+++ b/SVM/Instructions/MUL.cs
@@ -6,7 +6,7 @@ namespace SVM.Instructions
 {
     class MUL : ADD
     {
-        public override string ASM => "SUB";
+        public override string ASM => "MUL";
 
         public override byte OP => 0x24;
         
diff --git a/SVM/Instructions/RET.cs b/SVM/Instructions/RET.cs
index a632f02..f87116d 100644
--- a/SVM/Instructions/RET.cs
+++ b/SVM/Instructions/RET.cs
@@ -19,10 +19,11 @@ namespace SVM.Instructions
         public override void Exec(VM vm, byte[] vars)
         {
             Debug.Assert(vars.Length == 0);
-            Debug.Assert(vm.SP >= 0);
+            Debug.Assert(vm.SP > 0);
 
+            vm.SP--;
             vm.PC = vm.STACK[vm.SP];
-            vm.STACK[vm.SP--] = 0;
+            vm.STACK[vm.SP] = 0;
         }
 
         public override string ToASM(byte[] vars)
diff --git a/SVM/PGM/CALL.txt b/SVM/PGM/CALL.txt
new file mode 100644
index 0000000..89d79c2
--- /dev/null
+++ b/SVM/PGM/CALL.txt
@@ -0,0 +1,29 @@
+ORIGIN 0
+JMP :PGM
+
+:WRITESTR
+SETI A
+:WRITESTR_LOOP
+LOADI A
+JZ A :WRITESTR_RET
+SAVE A P 0
+INCI
+JMP :WRITESTR_LOOP
+:WRITESTR_RET
+RET
+
+:WRITENL
+LOAD A L 13
+SAVE A P 0
+LOAD A L 10
+SAVE A P 0
+RET
+
+:PGM
+LOAD A L 0x100
+CALL :WRITESTR
+CALL :WRITENL
+HALT
+
+MEMORY
+0x100	"CALL/RET Test"
\ No newline at end of file
diff --git a/SVM/PGM/A.txt b/SVM/PGM/HELLO.txt
similarity index 100%
rename from SVM/PGM/A.txt
rename to SVM/PGM/HELLO.txt
diff --git a/SVM/Program.cs b/SVM/Program.cs
index 00a412b..fcd80d5 100644
--- a/SVM/Program.cs
+++ b/SVM/Program.cs
@@ -7,8 +7,18 @@ namespace SVM
     {
         static void Main(string[] args)
         {
+            if (args.Length == 0)
+            {
+                Console.WriteLine("Usage: dotnet SVN.dll [Filename]");
+                return;
+            }
             var file = Path.Combine(Environment.CurrentDirectory, args[0]);
 
+            if (!File.Exists(file))
+            {
+                Console.WriteLine("Error: File Not Found");
+            }
+
             var content = File.ReadAllText(file);
 
             Console.WriteLine("Assembling {0}", file);
@@ -16,7 +26,8 @@ namespace SVM
             var asm = new Assembler();
 
             var mem = asm.Compile(content);
-
+            Console.WriteLine("Compiled to {0} bytes", mem.Length);
+            
             var vm = new VM();
             vm.CycleDelay = 25;
             vm.Load(mem, 0);
diff --git a/SVM/SVM.csproj b/SVM/SVM.csproj
index 96924e4..998612e 100644
--- a/SVM/SVM.csproj
+++ b/SVM/SVM.csproj
@@ -3,14 +3,20 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.0</TargetFramework>
+    <StartupObject></StartupObject>
+    <ApplicationIcon />
   </PropertyGroup>
 
   <ItemGroup>
-    <None Remove="PGM\A.txt" />
+    <None Remove="PGM\CALL.txt" />
+    <None Remove="PGM\HELLO.txt" />
   </ItemGroup>
 
   <ItemGroup>
-    <Content Include="PGM\A.txt">
+    <Content Include="PGM\CALL.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="PGM\HELLO.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
diff --git a/SVM/VM.cs b/SVM/VM.cs
index 93e1d07..5e82eee 100644
--- a/SVM/VM.cs
+++ b/SVM/VM.cs
@@ -69,14 +69,13 @@ namespace SVM
         {
             if (RUN)
             {
-                //Get op
                 var pc = PC;
                 var instr = instructions[MEM[PC++]];
                 byte[] decoded = instr.Decode(this);
-                Console.WriteLine("A{0} B{1} C{2} D{3}", R[0], R[1], R[2], R[3]);
-                Console.WriteLine("0x{0:X4} {1}", pc, instr.ToASM(decoded));
+                //Console.WriteLine("A{0} B{1} C{2} D{3}", R[0], R[1], R[2], R[3]);
+                //Console.WriteLine("0x{0:X4} {1}", pc, instr.ToASM(decoded));
                 instr.Exec(this, decoded);
-                Console.ReadKey(true);
+                //Console.ReadKey(true);
             }
         }
     }