diff --git a/Cart_Reader/7800.ino b/Cart_Reader/7800.ino
index ef4058e6..428974ba 100644
--- a/Cart_Reader/7800.ino
+++ b/Cart_Reader/7800.ino
@@ -77,13 +77,18 @@ byte a7800size;
 // 07 MAPPER
 // 08 ROM SIZE
 
+bool enable_clockgen = false;
+bool clockgen_selected = false;
+
 //******************************************
 //  Menu
 //******************************************
 // Base Menu
 static const char* const menuOptions7800[] PROGMEM = { FSTRING_SELECT_CART, FSTRING_READ_ROM, FSTRING_SET_SIZE, FSTRING_RESET };
+// Clock Gen Menu
+static const char* const menuClockGen7800[] PROGMEM = { FSTRING_CLKGEN_OFF, FSTRING_CLKGEN_ON };
 
-void setup_7800() {
+void setup_7800(bool display_status) {
   // Request 5V
   setVoltage(VOLTS_SET_5V);
 
@@ -131,34 +136,68 @@ void setup_7800() {
   // Set Eeprom clock to 1Mhz
   clockgen.set_freq(200000000ULL, SI5351_CLK1);
 
-  // Start outputting Eeprom clock
-  clockgen.output_enable(SI5351_CLK1, 1);  // Eeprom clock
+  if (enable_clockgen) {
+    // Start outputting Eeprom clock
+    clockgen.output_enable(SI5351_CLK1, 1);  // Eeprom clock
+  } else {
+    clockgen.output_enable(SI5351_CLK1, 0); // SI5351_CLK_DISABLE = 0
+    clockgen.set_clock_disable(SI5351_CLK1, 2); // SI5351_CLK_DISABLE_HI_Z = 2
+  }
 
   // Wait for clock generator
   clockgen.update_status();
-
-#else
-  // Set CLK(PH1) to Output
-  DDRH |= (1 << 1);
-  // Output a high signal CLK(PH1)
-  PORTH |= (1 << 1);
 #endif
 
-  checkStatus_7800();
+  if (!enable_clockgen) {
+    // Set CLK(PH1) to Output
+    DDRH |= (1 << 1);
+    // Output a high signal CLK(PH1)
+    PORTH |= (1 << 1);
+  }
+
+  if (display_status) {
+    checkStatus_7800();
+  }
+  
   strcpy(romName, "ATARI");
 
   mode = CORE_7800;
 }
 
 void a7800Menu() {
+  uint8_t mainMenu;
+
+#ifdef ENABLE_CLOCKGEN
+  if (!clockgen_selected) {
+    convertPgm(menuClockGen7800, 2);
+    mainMenu = question_box(F("ATARI 7800 MENU"), menuOptions, 2, 0);
+
+    switch (mainMenu) {
+      case 0:
+        // Disable Clock Gen
+        enable_clockgen = false;
+        break;
+
+      case 1:
+        // Enable Clock Gen
+        enable_clockgen = true;
+        break;
+    }
+
+    setup_7800(true);
+
+    clockgen_selected = true;
+  }
+#endif
+
   convertPgm(menuOptions7800, 4);
-  uint8_t mainMenu = question_box(F("ATARI 7800 MENU"), menuOptions, 4, 0);
+  mainMenu = question_box(F("ATARI 7800 MENU"), menuOptions, 4, 0);
 
   switch (mainMenu) {
     case 0:
       // Select Cart
       setCart_7800();
-      setup_7800();
+      setup_7800(true);
       break;
 
     case 1:
@@ -579,6 +618,7 @@ void checkStatus_7800() {
   print_Msg(FS(FSTRING_ROM_SIZE));
   print_Msg(a7800[a7800size]);
   println_Msg(F("K"));
+  println_Msg(enable_clockgen ? FS(FSTRING_CLKGEN_ON) : FS(FSTRING_CLKGEN_OFF));
   display_Update();
   wait();
 #else
@@ -605,7 +645,8 @@ void checkStatus_7800() {
   Serial.print(FS(FSTRING_ROM_SIZE));
   Serial.print(A7800[a7800size]);
   Serial.println(F("K"));
-  Serial.println(FS(FSTRING_EMPTY));
+  Serial.println(F("K"));
+  Serial.println(enable_clockgen ? FS(FSTRING_CLKGEN_ON) : FS(FSTRING_CLKGEN_OFF));
 #endif
 }
 
diff --git a/Cart_Reader/Cart_Reader.ino b/Cart_Reader/Cart_Reader.ino
index 619126ed..17857444 100644
--- a/Cart_Reader/Cart_Reader.ino
+++ b/Cart_Reader/Cart_Reader.ino
@@ -1455,7 +1455,7 @@ void mainMenu() {
 
 #ifdef ENABLE_7800
     case SYSTEM_MENU_7800:
-      setup_7800();
+      setup_7800(false);
       return a7800Menu();
       break;
 #endif
diff --git a/Cart_Reader/OSCR.cpp b/Cart_Reader/OSCR.cpp
index 6a8a8ee0..2961b586 100644
--- a/Cart_Reader/OSCR.cpp
+++ b/Cart_Reader/OSCR.cpp
@@ -80,6 +80,8 @@ constexpr char PROGMEM FSTRING_CHECKSUM[] = "Checksum: ";
 constexpr char PROGMEM FSTRING_ROM_SIZE[] = "ROM Size: ";
 constexpr char PROGMEM FSTRING_REVISION[] = "Revision: ";
 constexpr char PROGMEM FSTRING_SERIAL[] = "Serial: ";
+constexpr char PROGMEM FSTRING_CLKGEN_ON[] = "Enable Clock Gen";
+constexpr char PROGMEM FSTRING_CLKGEN_OFF[] = "Disable Clock Gen";
 
 /*==== /CONSTANTS =================================================*/
 
diff --git a/Cart_Reader/OSCR.h b/Cart_Reader/OSCR.h
index 7e6b87a3..efdacb4a 100644
--- a/Cart_Reader/OSCR.h
+++ b/Cart_Reader/OSCR.h
@@ -130,6 +130,8 @@ extern const char PROGMEM FSTRING_NAME[];
 extern const char PROGMEM FSTRING_CHECKSUM[];
 extern const char PROGMEM FSTRING_REVISION[];
 extern const char PROGMEM FSTRING_SERIAL[];
+extern const char PROGMEM FSTRING_CLKGEN_ON[];
+extern const char PROGMEM FSTRING_CLKGEN_OFF[];
 
 #define FS(pmem_string) (reinterpret_cast<const __FlashStringHelper *>(pmem_string))