diff --git a/ass2/simulator/.qtcreator/CMakeLists.txt.user b/ass2/simulator/.qtcreator/CMakeLists.txt.user
index 282a626..b3e0eab 100644
--- a/ass2/simulator/.qtcreator/CMakeLists.txt.user
+++ b/ass2/simulator/.qtcreator/CMakeLists.txt.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 18.0.0, 2025-11-25T13:50:30. -->
+<!-- Written by QtCreator 18.0.0, 2025-11-27T14:56:33. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -105,16 +105,16 @@
     <value type="int" key="CMake.Configure.BaseEnvironment">2</value>
     <value type="bool" key="CMake.Configure.ClearSystemEnvironment">false</value>
     <valuelist type="QVariantList" key="CMake.Configure.UserEnvironmentChanges"/>
-    <value type="QString" key="CMake.Initial.Parameters">-DCMAKE_PREFIX_PATH:PATH=%{Qt:QT_INSTALL_PREFIX}
--DQT_QMAKE_EXECUTABLE:FILEPATH=%{Qt:qmakeExecutable}
+    <value type="QString" key="CMake.Initial.Parameters">-DQT_QMAKE_EXECUTABLE:FILEPATH=%{Qt:qmakeExecutable}
+-DCMAKE_C_COMPILER:FILEPATH=%{Compiler:Executable:C}
 -DCMAKE_BUILD_TYPE:STRING=Debug
+-DCMAKE_CXX_COMPILER:FILEPATH=%{Compiler:Executable:Cxx}
 -DCMAKE_COLOR_DIAGNOSTICS:BOOL=ON
 -DCMAKE_GENERATOR:STRING=Ninja
+-DCMAKE_CXX_FLAGS_INIT:STRING=%{Qt:QML_DEBUG_FLAG}
 -DQT_MAINTENANCE_TOOL:FILEPATH=/home/aljaz/Qt/MaintenanceTool
 -DCMAKE_PROJECT_INCLUDE_BEFORE:FILEPATH=%{BuildConfig:BuildDirectory:NativeFilePath}/.qtc/package-manager/auto-setup.cmake
--DCMAKE_CXX_COMPILER:FILEPATH=%{Compiler:Executable:Cxx}
--DCMAKE_C_COMPILER:FILEPATH=%{Compiler:Executable:C}
--DCMAKE_CXX_FLAGS_INIT:STRING=%{Qt:QML_DEBUG_FLAG}</value>
+-DCMAKE_PREFIX_PATH:PATH=%{Qt:QT_INSTALL_PREFIX}</value>
     <value type="int" key="EnableQmlDebugging">0</value>
     <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">/home/aljaz/Desktop/spo/ass2/simulator/build/Desktop_Qt_6_10_1-Debug</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
diff --git a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.cpp.FD5DF53B10242751.idx b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.cpp.FD5DF53B10242751.idx
index 2053dbc..d0731ff 100644
Binary files a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.cpp.FD5DF53B10242751.idx and b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.cpp.FD5DF53B10242751.idx differ
diff --git a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.h.D09D611E77E172BE.idx b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.h.D09D611E77E172BE.idx
index 86a7f4c..f8413d5 100644
Binary files a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.h.D09D611E77E172BE.idx and b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/machine.h.D09D611E77E172BE.idx differ
diff --git a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/opcode.h.2460D9A23E2279B0.idx b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/opcode.h.2460D9A23E2279B0.idx
index de57000..e12b481 100644
Binary files a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/opcode.h.2460D9A23E2279B0.idx and b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/.qtc_clangd/.cache/clangd/index/opcode.h.2460D9A23E2279B0.idx differ
diff --git a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/Testing/Temporary/LastTest.log b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/Testing/Temporary/LastTest.log
index b42501f..a10933d 100644
--- a/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/Testing/Temporary/LastTest.log
+++ b/ass2/simulator/build/Desktop_Qt_6_10_1-Debug/Testing/Temporary/LastTest.log
@@ -1,3 +1,3 @@
-Start testing: Nov 27 14:24 CET
+Start testing: Dec 04 13:01 CET
 ----------------------------------------------------------
-End testing: Nov 27 14:24 CET
+End testing: Dec 04 13:01 CET
diff --git a/ass2/simulator/machine.cpp b/ass2/simulator/machine.cpp
index c316ba3..f7d473b 100644
--- a/ass2/simulator/machine.cpp
+++ b/ass2/simulator/machine.cpp
@@ -1,5 +1,6 @@
 #include "machine.h"
 #include "device.h"
+#include "opcode.h"
 #include <stdexcept>
 
 using namespace std;
@@ -95,15 +96,55 @@ void Machine::setDevice(int num, Device* device) {
 
 
 void Machine::notImplemented(string mnemonic) {
-    throw std::runtime_error("Instruction: " + mnemonic + " is not yet implemented.");
+    std::cerr << "Instruction: " << mnemonic << " is not yet implemented." << endl;
 }
 
 void Machine::invalidOpcode(int opcode) {
-    throw std::runtime_error("Invalid opcode: " + to_string(opcode));
+    std::cerr << "Invalid opcode: " << to_string(opcode) << endl;
 }
 
 void Machine::invalidAddressing() {
-    throw std::runtime_error("Invalid addressing used.");
+    std::cerr << "Invalid addressing used." << endl;
+}
+
+// Nalozi in vrni en bajt z naslova PC
+// in ga poveca za 1
+int Machine::fetch() {
+    int address = getReg(8);
+    setReg(8, address + 1);
+    return readByte(address);
+}
+
+
+void Machine::execute() {
+    int opcode = fetch();
+    int operand;
+    switch (opcode) {
+    // Format 1
+    case Opcode::FIX:
+    case Opcode::FLOAT:
+    case Opcode::NORM:
+        execF1(opcode);
+        break;
+
+    // Format 2
+    case Opcode::ADDR:
+    case Opcode::CLEAR:
+    case Opcode::DIVR:
+    case Opcode::MULR:
+    case Opcode::RMO:
+    case Opcode::SHIFTL:
+    case Opcode::SHIFTR:
+    case Opcode::SUBR:
+        operand = fetch();
+        execF2(opcode, operand);
+        break;
+
+    // Format 3/4 (SIC/XE)
+    default:
+        decode_F3_F4(opcode);
+        break;
+    }
 }
 
 
@@ -113,3 +154,6 @@ void Machine::invalidAddressing() {
 
 
 
+
+
+
diff --git a/ass2/simulator/machine.h b/ass2/simulator/machine.h
index 5c86b08..869170f 100644
--- a/ass2/simulator/machine.h
+++ b/ass2/simulator/machine.h
@@ -53,11 +53,19 @@ public:
 
     void notImplemented(string mnemonic);
 
-    // Izvajalnik je naletel na operacijsko kodo ukaza, ki ni veljavna.
     void invalidOpcode(int opcode);
 
-    // Neveljavno naslavljanje.
     void invalidAddressing();
+
+    int fetch();
+
+    void execute();
+
+    bool execF1(int opcode);
+
+    bool execF2(int opcode, int operand);
+
+    bool execSICF3F4(int opcode, int ni, int operand);
 };
 
 #endif