diff --git a/src/c0vm.js b/src/c0vm.js
index 9cb7e30..237cf44 100755
--- a/src/c0vm.js
+++ b/src/c0vm.js
@@ -16,6 +16,21 @@ function c0_memory_error(val) {
     throw ("c0 memory error: " + val);
 }
 
+function i32_to_array(i32) {
+    return [(i32 & 0xFF),
+            ((i32 >> 8) & 0xFF),
+            ((i32 >> 16) & 0xFF),
+            ((i32 >> 24) & 0xFF)];
+            
+}
+
+function array_to_i32(array) {
+    return array[0] +
+        (array[1] << 8) +
+        (array[2] << 16) +
+        (array[3] << 24);
+}
+
 var StackFrame = function(file, f) {
     log("Creating stack frame");
     this.stack = [];
@@ -375,13 +390,49 @@ ProgramState.prototype.step = function() {
     case op.IMLOAD:
         var addr = this.pop();
         // Get int32 from bytes
-        var val = this.heapdsfjsldkfjsd
-        this.push(this.heap[addr]);
+        var c1 = this.heap[addr];
+        var c2 = this.heap[addr+1];
+        var c3 = this.heap[addr+2];
+        var c4 = this.heap[addr+3];
+        var combined = array_to_i32([c1, c2, c3, c4]);
+        this.push(combined);
         this.frame.pc++;
         break;
 
     case op.IMSTORE:
-        
+        var value = this.pop();
+        var addr = this.pop();
+        var array = i32_to_array(value);
+
+        for (var i = 0; i < 4; i++)
+            this.heap[addr + i] = array[i];
+        this.frame.pc++;
+
+    case op.AMLOAD:
+        var addr = this.pop();
+        this.push(this.heap[addr]);
+        this.frame.pc++;
+        break;
+
+    case op.AMSTORE:
+        var value = this.pop();
+        var addr = this.pop();
+        this.heap[addr] = value;
+        this.frame.pc++;
+        break;
+
+    case op.CMLOAD:
+        var addr = this.pop();
+        this.push(this.heap[addr]);
+        this.frame.pc++;
+        break;
+
+    case op.CMSTORE:
+        var value = this.pop();
+        var addr = this.pop();
+        this.heap[addr] = value;
+        this.frame.pc++;
+        break;
 
     default:
         var opcode_name;
diff --git a/src/index.js b/src/index.js
index 94d2a1d..09a1678 100644
--- a/src/index.js
+++ b/src/index.js
@@ -14,10 +14,12 @@ callbacks = {};
 callbacks[c0ffi.NATIVE_PRINT] = function(args) {
     console.log("Print function says: " + args[0]);
 }
-callbacks["printint"] = function(args) {
+callbacks[c0ffi.NATIVE_PRINTINT] = function(args) {
     console.log("Printint function says: " + args[0]);
 }
 
-var file = parser.parse("../test/sample2.5.c0.bc0");
+console.log(callbacks);
+
+var file = parser.parse("../test/structs.c0.bc0");
 console.log("Result is " + c0vm.execute(file, callbacks));
 
diff --git a/test/structs.c0.bc0 b/test/structs.c0.bc0
index 1a94959..6183a15 100644
--- a/test/structs.c0.bc0
+++ b/test/structs.c0.bc0
@@ -49,6 +49,6 @@ B0       # return          #
 
 00 02             # native count
 # native pool
-00 01 00 06       # print
-00 01 00 09       # printint
+00 01 00 10       # print
+00 01 00 13       # printint
 
diff --git a/test/tests.js b/test/tests.js
index ce060b1..c77ee49 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -65,7 +65,7 @@ exports.testArrays = function(test) {
 exports.testStructs = function(test) {
     printout = "";
     var result = c0vm.execute(parser.parse("structs.c0.bc0"), callbacks, false);
-    test.ok(printout == "expected result here",
+    test.ok(printout == "potato chip123",
             "structs.c0.bc0 - Did not print to screen correctly, result was " + 
             printout);
     test.done();