diff --git a/simulator_SIC_XE/gui/qt/MachineController.cpp b/simulator_SIC_XE/gui/qt/MachineController.cpp
index 9861e0c..0ea4178 100644
--- a/simulator_SIC_XE/gui/qt/MachineController.cpp
+++ b/simulator_SIC_XE/gui/qt/MachineController.cpp
@@ -42,13 +42,8 @@ void MachineController::runLoop() {
         try {
             if (m_machine) {
                 m_machine->execute();
-                m_machine->tick(); 
+                m_machine->tick();
                 emit tick();
-                
-                if (m_machine->isStopped()) {
-                    m_running.store(false);
-                    break;
-                }
             }
         } catch (const std::exception &e) {
             emit error(QString::fromStdString(e.what()));
diff --git a/simulator_SIC_XE/gui/qt/mainwindow.cpp b/simulator_SIC_XE/gui/qt/mainwindow.cpp
index dcdb9bc..de0ca3c 100644
--- a/simulator_SIC_XE/gui/qt/mainwindow.cpp
+++ b/simulator_SIC_XE/gui/qt/mainwindow.cpp
@@ -17,9 +17,6 @@
 #include <QVBoxLayout>
 #include <QLabel>
 #include <QFont>
-#include <QFileDialog>
-#include <QMessageBox>
-#include <QScrollBar>
 
 class Loader;
 
@@ -72,8 +69,8 @@ MainWindow::MainWindow(QWidget *parent) :
     ui->regF_bin_field->setValidator(floatBinValidator);
 
 
-    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateRegisterDisplays, Qt::QueuedConnection);
-    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateMemoryDisplay, Qt::QueuedConnection);
+    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateRegisterDisplays);
+    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateMemoryDisplay);
     
     connectRegisterFields();
     
@@ -98,16 +95,15 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(ui->DisasmDec65536Btn, &QPushButton::clicked, this, &MainWindow::onDisassemblyDec256);
     connect(ui->DisasmGoToStart, &QPushButton::clicked, this, &MainWindow::onDisassemblyGoToStart);
     connect(ui->DisasmGoToEnd, &QPushButton::clicked, this, &MainWindow::onDisassemblyGoToEnd);
-    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateDisassemblyDisplay, Qt::QueuedConnection);
-    
-    // Connect menu actions
-    connect(ui->actionLoad_Object_File, &QAction::triggered, this, &MainWindow::loadObjectFile);
+    connect(m_controller.get(), &MachineController::tick, this, &MainWindow::updateDisassemblyDisplay);
     
     setupMemoryDisplay();
     setupDisassemblyDisplay();
 
     loadInstructionSet();
-    // Don't load any program by default - user will load via File menu
+    //loadDemoProgram();
+    Loader loader(m_machine, std::string(PATH_RESOURCES) + "print.obj");
+    loader.load();
     
     updateRegisterDisplays();
     updateMemoryDisplay();
@@ -699,18 +695,7 @@ MainWindow::DisassembledInstruction MainWindow::disassembleAt(int address)
                 QString reg1Str = (r1 < 10) ? regNames[r1] : "?";
                 QString reg2Str = (r2 < 10) ? regNames[r2] : "?";
                 
-                // Check if this is a single-operand Format 2 instruction
-                QString mnem = result.mnemonic.toUpper();
-                if (mnem == "CLEAR" || mnem == "TIXR") {
-                    result.operand = reg1Str;
-                } else if (mnem == "SVC") {
-                    result.operand = QString::number(r1);
-                } else if (mnem == "SHIFTL" || mnem == "SHIFTR") {
-                    result.operand = QString("%1, %2").arg(reg1Str).arg(r2);
-                } else {
-                    // Two register operands (ADDR, SUBR, COMPR, etc.)
-                    result.operand = QString("%1, %2").arg(reg1Str).arg(reg2Str);
-                }
+                result.operand = QString("%1, %2").arg(reg1Str).arg(reg2Str);
             }
             break;
         }
@@ -775,7 +760,7 @@ MainWindow::DisassembledInstruction MainWindow::disassembleAt(int address)
                     QString addrMode = "";
                     
                     if (p) {
-                        ea += (address + 3);
+                        ea += m_machine->getPC();
                         addrMode = " (PC)";
                     } else if (b) {
                         ea += m_machine->getB();
@@ -864,13 +849,7 @@ void MainWindow::updateDisassemblyDisplay()
     layout->addStretch();
     container->setLayout(layout);
     
-    // Save scroll position before updating
-    int scrollPos = ui->DisasemblyScrollArea->verticalScrollBar()->value();
-    
     ui->DisasemblyScrollArea->setWidget(container);
-    
-    // Restore scroll position after updating
-    ui->DisasemblyScrollArea->verticalScrollBar()->setValue(scrollPos);
 }
 
 void MainWindow::updateMemoryDisplay()
@@ -937,44 +916,5 @@ void MainWindow::updateMemoryDisplay()
     layout->addStretch();
     container->setLayout(layout);
     
-    int scrollPos = ui->MemoryScrollArea->verticalScrollBar()->value();
-    
     ui->MemoryScrollArea->setWidget(container);
-    
-    ui->MemoryScrollArea->verticalScrollBar()->setValue(scrollPos);
-}
-
-void MainWindow::loadObjectFile()
-{
-    QString fileName = QFileDialog::getOpenFileName(this,
-        tr("Load Object File"), 
-        QString(),
-        tr("Object Files (*.obj);;All Files (*)"));
-    
-    if (fileName.isEmpty()) {
-        return;
-    }
-    
-    try {
-        // Stop execution if running
-        m_controller->stop();
-        
-        // Reset machine state
-        m_machine->reset();
-        
-        // Load the object file
-        Loader loader(m_machine, fileName.toStdString());
-        loader.load();
-        
-        // Update displays
-        updateRegisterDisplays();
-        updateMemoryDisplay();
-        updateDisassemblyDisplay();
-        
-        QMessageBox::information(this, tr("Success"), 
-            tr("Object file loaded successfully"));
-    } catch (const std::exception &e) {
-        QMessageBox::critical(this, tr("Error"), 
-            tr("Failed to load object file: %1").arg(e.what()));
-    }
 }
diff --git a/simulator_SIC_XE/gui/qt/mainwindow.h b/simulator_SIC_XE/gui/qt/mainwindow.h
index caa9550..1e39a7d 100644
--- a/simulator_SIC_XE/gui/qt/mainwindow.h
+++ b/simulator_SIC_XE/gui/qt/mainwindow.h
@@ -50,7 +50,6 @@ private slots:
     void onDisassemblyDec256();
     void onDisassemblyGoToStart();
     void onDisassemblyGoToEnd();
-    void loadObjectFile();
 
 private:
     Ui::MainWindow *ui;
diff --git a/simulator_SIC_XE/gui/qt/mainwindow.ui b/simulator_SIC_XE/gui/qt/mainwindow.ui
index e9084bd..2fad622 100644
--- a/simulator_SIC_XE/gui/qt/mainwindow.ui
+++ b/simulator_SIC_XE/gui/qt/mainwindow.ui
@@ -866,18 +866,6 @@
     </widget>
    </widget>
   </widget>
-  <widget class="QStatusBar" name="statusbar"/>
-  <widget class="QToolBar" name="toolBar">
-   <property name="windowTitle">
-    <string>toolBar</string>
-   </property>
-   <attribute name="toolBarArea">
-    <enum>TopToolBarArea</enum>
-   </attribute>
-   <attribute name="toolBarBreak">
-    <bool>false</bool>
-   </attribute>
-  </widget>
   <widget class="QMenuBar" name="menubar">
    <property name="geometry">
     <rect>
@@ -887,43 +875,8 @@
      <height>20</height>
     </rect>
    </property>
-   <widget class="QMenu" name="menuFile">
-    <property name="title">
-     <string>File</string>
-    </property>
-    <addaction name="actionLoad_Object_File"/>
-   </widget>
-   <widget class="QMenu" name="menuMachine">
-    <property name="title">
-     <string>Machine</string>
-    </property>
-    <addaction name="actionFrequency"/>
-   </widget>
-   <widget class="QMenu" name="menuHelp">
-    <property name="title">
-     <string>Help</string>
-    </property>
-    <addaction name="actionAbout"/>
-   </widget>
-   <addaction name="menuFile"/>
-   <addaction name="menuMachine"/>
-   <addaction name="menuHelp"/>
   </widget>
-  <action name="actionLoad_Object_File">
-   <property name="text">
-    <string>Load Object File</string>
-   </property>
-  </action>
-  <action name="actionFrequency">
-   <property name="text">
-    <string>Frequency</string>
-   </property>
-  </action>
-  <action name="actionAbout">
-   <property name="text">
-    <string>About</string>
-   </property>
-  </action>
+  <widget class="QStatusBar" name="statusbar"/>
  </widget>
  <resources/>
  <connections/>
diff --git a/simulator_SIC_XE/include/file_device.h b/simulator_SIC_XE/include/file_device.h
index 01b433c..a08e2ac 100644
--- a/simulator_SIC_XE/include/file_device.h
+++ b/simulator_SIC_XE/include/file_device.h
@@ -17,7 +17,6 @@ private:
     std::fstream fileStream;
     std::string filename;
     bool fileCreated;
-    std::streampos readPosition;
 };
 
 #endif // FILE_DEVICE_H
\ No newline at end of file
diff --git a/simulator_SIC_XE/include/machine.h b/simulator_SIC_XE/include/machine.h
index cd14f74..8e80669 100644
--- a/simulator_SIC_XE/include/machine.h
+++ b/simulator_SIC_XE/include/machine.h
@@ -26,7 +26,7 @@ using std::cout;
 class Machine {
 public:
     Machine();
-    Machine(int speedHz) : Machine() { this->speedHz = speedHz; _instructionsTable = instructions; }
+    Machine(int speedkHz) : Machine() { this->speedkHz = speedkHz; _instructionsTable = instructions; }
     ~Machine();
 
     int getA() const { return A; }
@@ -84,13 +84,11 @@ public:
 
     // Execution and speed control
     int getSpeed() const;
-    void setSpeed(int Hz);
+    void setSpeed(int kHz);
     void start();
     void stop();
     void tick();
     void halt();
-    bool isStopped() const { return _stopped; }
-    void reset();
 
     // error handling methods
     void notImplemented(string mnemonic);
@@ -130,7 +128,7 @@ private:
 
     // Execution control
     std::atomic<bool> running{false};
-    std::atomic<int> speedHz{10};  // Default 10 Hz
+    std::atomic<int> speedkHz{1};  // Default 1 kHz
 
     bool execF1(int opcode);
     bool execF2(int opcode, int operand);
diff --git a/simulator_SIC_XE/src/file_device.cpp b/simulator_SIC_XE/src/file_device.cpp
index 781a9b6..8ca554f 100644
--- a/simulator_SIC_XE/src/file_device.cpp
+++ b/simulator_SIC_XE/src/file_device.cpp
@@ -3,8 +3,9 @@
 #include <fstream>
 
 FileDevice::FileDevice(const std::string &filename)
-    : filename(filename), fileCreated(false), readPosition(0)
+    : filename(filename), fileCreated(false)
 {
+    // Don't create the file yet - wait until first write
 }
 
 FileDevice::~FileDevice()
@@ -17,16 +18,9 @@ FileDevice::~FileDevice()
 void FileDevice::ensureFileOpen()
 {
     if (!fileStream.is_open()) {
-        // Check if file exists
-        std::ifstream checkFile(filename);
-        bool fileExists = checkFile.good();
-        checkFile.close();
-        
-        if (fileExists) {
-            fileStream.open(filename, std::ios::in | std::ios::out | std::ios::ate);
-            fileCreated = true;
+        if (fileCreated) {
+            fileStream.open(filename, std::ios::in | std::ios::out);
         } else {
-            // Create new file
             std::ofstream create(filename);
             if (!create) {
                 throw std::runtime_error("Failed to create file: " + filename);
@@ -47,11 +41,9 @@ unsigned char FileDevice::read()
     unsigned char value = 0;
     ensureFileOpen();
     if (fileStream.is_open()) {
-        fileStream.seekg(readPosition);
         char ch;
         if (fileStream.get(ch)) {
             value = static_cast<unsigned char>(ch);
-            readPosition = fileStream.tellg();
         }
     }
     return value;
@@ -61,7 +53,6 @@ void FileDevice::write(unsigned char value)
 {
     ensureFileOpen();
     if (fileStream.is_open()) {
-        fileStream.seekp(0, std::ios::end);
         fileStream.put(static_cast<char>(value));
         fileStream.flush();
     }
diff --git a/simulator_SIC_XE/src/loader.cpp b/simulator_SIC_XE/src/loader.cpp
index 8d3aa17..9b3d293 100644
--- a/simulator_SIC_XE/src/loader.cpp
+++ b/simulator_SIC_XE/src/loader.cpp
@@ -1,10 +1,8 @@
 #include "loader.h"
 #include "file_reader.h"
-#include "string_reader.h"
 #include "machine.h"
 #include "constants.h"
 #include <algorithm>
-#include <cstdio>
 
 Loader::~Loader()
 {
@@ -84,24 +82,20 @@ Loader::TextRecord Loader::readTextRecord()
     if(FILE_CONTAINS_WHITE_SPACES) _file_reader->readByte();
 
     // Read length (1 byte, 2 hex digits)
-    std::string lengthStr = _file_reader->readString(2);
-    int length = std::stoi(lengthStr, nullptr, 16);
-    
-    // Read the rest of the line (data bytes with spaces)
-    std::string dataLine = _file_reader->readLine();
-    
-    // Remove all whitespace from the data line
-    dataLine.erase(std::remove_if(dataLine.begin(), dataLine.end(), ::isspace), dataLine.end());
-    
-    // Now use StringReader to parse the hex bytes
-    StringReader stringReader(dataLine);
+    int length = std::stoi(_file_reader->readString(2), nullptr, 16);
+    if(FILE_CONTAINS_WHITE_SPACES) _file_reader->readByte();
+
     record.data.resize(length);
-    
+
+    int index = 0;
+    string byteStr = _file_reader->readLine();
+    // Remove spaces, newlines, and other whitespace characters
+    byteStr.erase(std::remove_if(byteStr.begin(), byteStr.end(), ::isspace), byteStr.end());
+
     for (int i = 0; i < length; ++i) {
-        std::string byteHex = stringReader.readString(2);
+        std::string byteHex = byteStr.substr(i * 2, 2);
         record.data[i] = static_cast<uint8_t>(std::stoi(byteHex, nullptr, 16));
     }
-    
     return record;
 }
 
diff --git a/simulator_SIC_XE/src/machine.cpp b/simulator_SIC_XE/src/machine.cpp
index d8d0356..e15e6c1 100644
--- a/simulator_SIC_XE/src/machine.cpp
+++ b/simulator_SIC_XE/src/machine.cpp
@@ -14,17 +14,6 @@ string prefix = "Machine error: ";
 
 Machine::Machine()
 {
-    // Initialize registers and memory to zero
-    A = B = X = L = S = T = PC = SW = 0;
-    F = 0.0;
-    for (int i = 0; i < MEMORY_SIZE; i++) {
-        memory[i] = 0;
-    }
-    for (int i = 0; i < VECTOR_REG_SIZE; i++) {
-        VA[i] = VS[i] = VT[i] = 0;
-    }
-    _stopped = false;
-    
     devices.resize(NUM_DEVICES);
     // device 0: standard input
     devices[0] = make_shared<InputDevice>(std::cin);
@@ -56,12 +45,12 @@ Machine::~Machine()
 
 int Machine::getSpeed() const
 {
-    return speedHz.load();
+    return speedkHz.load();
 }
 
-void Machine::setSpeed(int Hz)
+void Machine::setSpeed(int kHz)
 {
-    speedHz.store(Hz);
+    speedkHz.store(kHz);
 }
 
 // TODO: implement errors
@@ -149,10 +138,10 @@ void Machine::setVT(const int *values)
 
 void Machine::tick()
 {
-    const int speed = speedHz.load();
+    const int speed = speedkHz.load();
     if (speed <= 0) throw std::runtime_error("Invalid speed setting in Machine::tick"); 
     
-    const auto delay = std::chrono::milliseconds(1000 / speed);
+    const auto delay = std::chrono::microseconds(1000 / speed);
     std::this_thread::sleep_for(delay);
 }
 
@@ -161,27 +150,6 @@ void Machine::halt()
     _stopped = true;
 }
 
-void Machine::reset()
-{
-    // Reset all registers
-    A = B = X = L = S = T = PC = SW = 0;
-    F = 0.0;
-    
-    // Clear memory
-    for (int i = 0; i < MEMORY_SIZE; i++) {
-        memory[i] = 0;
-    }
-    
-    // Reset execution state
-    _stopped = false;
-    running.store(false);
-    
-    // Reset vector registers
-    for (int i = 0; i < VECTOR_REG_SIZE; i++) {
-        VA[i] = VS[i] = VT[i] = 0;
-    }
-}
-
 int Machine::getReg(int regNum) const
 {
     switch (regNum) {