diff --git a/Cart_Reader/Cart_Reader.ino b/Cart_Reader/Cart_Reader.ino
index 11b4940c..28eeb48d 100644
--- a/Cart_Reader/Cart_Reader.ino
+++ b/Cart_Reader/Cart_Reader.ino
@@ -66,7 +66,6 @@
  *****************************************/
 
 // SD Card
-#include "SdFat.h"
 SdFs sd;
 FsFile myFile;
 #ifdef global_log
@@ -2117,83 +2116,92 @@ int32_t initializeClockOffset() {
    Setup
  *****************************************/
 void setup() {
-#if !defined(enable_serial) && defined(ENABLE_UPDATER)
-  ClockedSerial.begin(UPD_BAUD);
-#endif
-
   // Set Button Pin PG2 to Input
   DDRG &= ~(1 << 2);
-#if defined(HW5) && !defined(ENABLE_VSELECT)
-  // HW5 has status LED connected to PD7
-  // Set LED Pin PD7 to Output
+# if defined(HW5) && !defined(ENABLE_VSELECT)
+  /**
+   * HW5 has status LED connected to PD7
+   * Set LED Pin PD7 to Output
+   **/
   DDRD |= (1 << 7);
   PORTD |= (1 << 7);
-#elif defined(ENABLE_VSELECT)
+# elif defined(ENABLE_VSELECT)
+  /**
+   * VSELECT uses pin PD7
+   * Set LED Pin PD7 to Output
+   **/
   DDRD |= (1 << 7);
-#else
-  // HW1/2/3 have button connected to PD7
-  // Set Button Pin PD7 to Input
+# else /* !defined(HW5) && !defined(HW5) */
+  /**
+   * HW1-3 have button connected to PD7
+   * Set pin PD7 to input for button
+   **/
   DDRD &= ~(1 << 7);
-#endif
-  // Activate Internal Pullup Resistors
-  //PORTG |= (1 << 2);
-  //PORTD |= (1 << 7);
+# endif /* HW5 &| ENABLE_VSELECT */
+
+  // Set power to low to protect carts
+  setVoltage(VOLTS_SET_3V3);
+
+# if defined(ENABLE_3V3FIX)
+  // Set clock high during setup
+  setClockScale(CLKSCALE_16MHZ);
+  delay(10);
+# endif /* ENABLE_3V3FIX */
 
+# if !defined(enable_serial) && defined(ENABLE_UPDATER)
+  ClockedSerial.begin(UPD_BAUD);
+  printVersionToSerial();
+  ClockedSerial.flush();
+# endif /* ENABLE_UPDATER */
 
-  // Read current folder number out of eeprom
+  // Read current folder number out of the EEPROM
   EEPROM_readAnything(0, foldern);
   if (foldern < 0) foldern = 0;
 
-#ifdef enable_LCD
+# ifdef enable_LCD
   display.begin();
   display.setContrast(40);
   display.setFont(u8g2_font_haxrcorp4089_tr);
-#endif
+# endif /* enable_LCD */
 
-#ifdef enable_neopixel
-#if defined(ENABLE_3V3FIX)
-  // Set power high for neopixel
-  setVoltage(VOLTS_SET_5V);
-  delay(10);
-#endif
+# ifdef enable_neopixel
   pixels.begin();
-  pixels.clear();
-  pixels.setPixelColor(0, pixels.Color(background_color));
-  pixels.setPixelColor(1, pixels.Color(0, 0, 100));
-  pixels.setPixelColor(2, pixels.Color(0, 0, 100));
-  pixels.show();
+  setColor_RGB(0, 0, 100);
 
   // Set TX0 LED Pin(PE1) to Output for status indication during flashing for HW4
-#if !(defined(enable_serial) || defined(HW5))
+#   if !(defined(enable_serial) || defined(HW5))
   DDRE |= (1 << 1);
-#endif
-#else
-#ifndef enable_LCD
-#ifdef CA_LED
+#   endif /* enable_serial */
+# else /* enable_neopixel */
+#   ifndef enable_LCD
+#     ifdef CA_LED
   // Turn LED off
   digitalWrite(12, 1);
   digitalWrite(11, 1);
   digitalWrite(10, 1);
-#endif
+#     endif /* CA_LED */
   // Configure 4 Pin RGB LED pins as output
   DDRB |= (1 << DDB6);  // Red LED (pin 12)
   DDRB |= (1 << DDB5);  // Green LED (pin 11)
   DDRB |= (1 << DDB4);  // Blue LED (pin 10)
-#endif
-#endif
+#   endif /* enable_LCD */
+# endif /* enable_neopixel */
 
-#ifdef ENABLE_VSELECT
-  // Set power to low to protect carts
-  setVoltage(VOLTS_SET_3V3);
-#endif
+# ifdef RTC_installed
+  // Start RTC
+  RTCStart();
 
-#ifdef enable_OLED
+  // Set Date/Time Callback Funtion
+  SdFile::dateTimeCallback(dateTime);
+# endif /* RTC_installed */
+
+# ifdef enable_OLED
   display.begin();
   //isplay.setContrast(40);
   display.setFont(u8g2_font_haxrcorp4089_tr);
-#endif
+# endif /* enable_OLED */
 
-#ifdef enable_serial
+# ifdef enable_serial
   // Serial Begin
   Serial.begin(9600);
   Serial.println("");
@@ -2201,52 +2209,73 @@ void setup() {
   Serial.println(F("2023 github.com/sanni"));
   // LED Error
   setColor_RGB(0, 0, 255);
-#endif
+# endif /* enable_serial */
 
   // Init SD card
   if (!sd.begin(SS)) {
     display_Clear();
+# ifdef ENABLE_VSELECT
+    print_STR(sd_error_STR, 1);
+    println_Msg(F(""));
+    println_Msg(F("Press button to enable 5V for"));
+    println_Msg(F("  updating firmware..."));
+    display_Update();
+    wait();
+    display_Clear();
+    setVoltage(VOLTS_SET_5V); // Set voltage high for flashing
+    println_Msg(F(" ======== UPDATE MODE ======== "));
+    println_Msg(F("Waiting for update..."));
+    println_Msg(F(""));
+    println_Msg(F("Press button to cancel/restart."));
+    display_Update();
+    wait();
+    resetArduino();
+# else /* !ENABLE_VSELECT */
     print_FatalError(sd_error_STR);
+# endif /* ENABLE_VSELECT */
   }
 
-#if !defined(enable_serial) && defined(ENABLE_UPDATER)
-  printVersionToSerial();
-  ClockedSerial.flush();
-#endif
+# if defined(ENABLE_CONFIG)
+  configInit();
+#   if defined(global_log)
+  loggingEnabled = !!configGetLong(F("oscr.logging"), 1);
+#   endif /*ENABLE_CONFIG*/
 
-#ifdef global_log
+  // Change LCD background if config specified
+#   ifdef enable_neopixel
+  setColor_RGB(0, 0, 100);
+#   endif /* enable_neopixel */
+# endif /* ENABLE_CONFIG */
+
+# ifdef global_log
   if (!myLog.open("OSCR_LOG.txt", O_RDWR | O_CREAT | O_APPEND)) {
     print_FatalError(sd_error_STR);
   }
   println_Msg(F(""));
-#if defined(HW1)
+#   if defined(HW1)
   print_Msg(F("OSCR HW1"));
-#elif defined(HW2)
+#   elif defined(HW2)
   print_Msg(F("OSCR HW2"));
-#elif defined(HW3)
+#   elif defined(HW3)
   print_Msg(F("OSCR HW3"));
-#elif defined(HW4)
+#   elif defined(HW4)
   print_Msg(F("OSCR HW4"));
-#elif defined(HW5)
+#   elif defined(HW5)
   print_Msg(F("OSCR HW5"));
-#elif defined(SERIAL_MONITOR)
+#   elif defined(SERIAL_MONITOR)
   print_Msg(F("OSCR Serial"));
-#endif
+#   endif /* HWn */
   print_Msg(F(" V"));
   println_Msg(ver);
-#endif
+# endif /* global_log */
 
-#ifdef RTC_installed
-  // Start RTC
-  RTCStart();
-
-  // Set Date/Time Callback Funtion
-  SdFile::dateTimeCallback(dateTime);
-#endif
-
-  // status LED ON
+  // Turn status LED on
   statusLED(true);
 
+#   if defined(ENABLE_3V3FIX)
+  setClockScale(CLKSCALE_8MHZ); // Set clock back to low after setup
+#   endif /* ENABLE_3V3FIX */
+
   // Start menu system
   mainMenu();
 }
@@ -2273,15 +2302,31 @@ void dataIn() {
 // Set RGB color
 void setColor_RGB(byte r, byte g, byte b) {
 #if defined(enable_neopixel)
-#if defined(ENABLE_3V3FIX)
+# if defined(ENABLE_3V3FIX)
   if (clock == CS_8MHZ) return;
-#endif
+# endif
   // Dim Neopixel LEDs
   if (r >= 100) r = 100;
   if (g >= 100) g = 100;
   if (b >= 100) b = 100;
+
   pixels.clear();
+
+# if defined(ENABLE_CONFIG)
+  uint8_t lcdConfColor = configGetLong(F("lcd.confColor"));
+
+  if (lcdConfColor > 0) {
+    uint8_t lcdRed = configGetLong(F("lcd.red"));
+    uint8_t lcdGreen = configGetLong(F("lcd.green"));
+    uint8_t lcdBlue = configGetLong(F("lcd.blue"));
+
+    pixels.setPixelColor(0, pixels.Color(lcdGreen, lcdRed, lcdBlue));
+  } else {
+    pixels.setPixelColor(0, pixels.Color(background_color));
+  }
+# else /* !ENABLE_CONFIG */
   pixels.setPixelColor(0, pixels.Color(background_color));
+# endif /* ENABLE_CONFIG */
   pixels.setPixelColor(1, pixels.Color(g, r, b));
   pixels.setPixelColor(2, pixels.Color(g, r, b));
   pixels.show();
@@ -2465,7 +2510,7 @@ void print_Msg(const __FlashStringHelper* string) {
   Serial.print(string);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(string);
+  if (!dont_log && loggingEnabled) myLog.print(string);
 #endif
 }
 
@@ -2494,7 +2539,7 @@ void print_Msg(const char myString[]) {
   Serial.print(myString);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(myString);
+  if (!dont_log && loggingEnabled) myLog.print(myString);
 #endif
 }
 
@@ -2506,7 +2551,7 @@ void print_Msg(long unsigned int message) {
   Serial.print(message);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(message);
+  if (!dont_log && loggingEnabled) myLog.print(message);
 #endif
 }
 
@@ -2518,7 +2563,7 @@ void print_Msg(byte message, int outputFormat) {
   Serial.print(message, outputFormat);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(message, outputFormat);
+  if (!dont_log && loggingEnabled) myLog.print(message, outputFormat);
 #endif
 }
 
@@ -2530,7 +2575,7 @@ void print_Msg(word message, int outputFormat) {
   Serial.print(message, outputFormat);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(message, outputFormat);
+  if (!dont_log && loggingEnabled) myLog.print(message, outputFormat);
 #endif
 }
 
@@ -2542,7 +2587,7 @@ void print_Msg(int message, int outputFormat) {
   Serial.print(message, outputFormat);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(message, outputFormat);
+  if (!dont_log && loggingEnabled) myLog.print(message, outputFormat);
 #endif
 }
 
@@ -2554,7 +2599,7 @@ void print_Msg(long unsigned int message, int outputFormat) {
   Serial.print(message, outputFormat);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(message, outputFormat);
+  if (!dont_log && loggingEnabled) myLog.print(message, outputFormat);
 #endif
 }
 
@@ -2566,7 +2611,7 @@ void print_Msg(String string) {
   Serial.print(string);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.print(string);
+  if (!dont_log && loggingEnabled) myLog.print(string);
 #endif
 }
 
@@ -2595,7 +2640,7 @@ void println_Msg(String string) {
   Serial.println(string);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.println(string);
+  if (!dont_log && loggingEnabled) myLog.println(string);
 #endif
 }
 
@@ -2608,7 +2653,7 @@ void println_Msg(byte message, int outputFormat) {
   Serial.println(message, outputFormat);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.println(message, outputFormat);
+  if (!dont_log && loggingEnabled) myLog.println(message, outputFormat);
 #endif
 }
 
@@ -2638,7 +2683,7 @@ void println_Msg(const char myString[]) {
   Serial.println(myString);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.println(myString);
+  if (!dont_log && loggingEnabled) myLog.println(myString);
 #endif
 }
 
@@ -2654,7 +2699,7 @@ void println_Msg(const __FlashStringHelper* string) {
   char myBuffer[15];
   strlcpy_P(myBuffer, (char*)string, 15);
   if ((strncmp(myBuffer, "Press Button...", 14) != 0) && (strncmp(myBuffer, "Select file", 10) != 0)) {
-    if (!dont_log) myLog.println(string);
+    if (!dont_log && loggingEnabled) myLog.println(string);
   }
 #endif
 }
@@ -2668,7 +2713,7 @@ void println_Msg(long unsigned int message) {
   Serial.println(message);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.println(message);
+  if (!dont_log && loggingEnabled) myLog.println(message);
 #endif
 }
 
@@ -2680,7 +2725,7 @@ void display_Update() {
   delay(100);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.flush();
+  if (!dont_log && loggingEnabled) myLog.flush();
 #endif
 }
 
@@ -2690,7 +2735,7 @@ void display_Clear() {
   display.setCursor(0, 8);
 #endif
 #ifdef global_log
-  if (!dont_log) myLog.println("");
+  if (!dont_log && loggingEnabled) myLog.println("");
 #endif
 }
 
@@ -2980,41 +3025,50 @@ void checkUpdater() {
   if (ClockedSerial.available() > 0) {
     String cmd = ClockedSerial.readStringUntil('\n');
     cmd.trim();
-    if (cmd == "VERCHK") {
+    if (cmd == "VERCHK")
+    { // VERCHK: Gets OSCR version and features
       delay(500);
       printVersionToSerial();
-    } else if (cmd == "GETCLOCK") {
-#if defined(ENABLE_3V3FIX)
+    }
+    else if (cmd == "GETCLOCK")
+    { // GETCLOCK: Gets the MEGA's current clock speed.
+# if defined(ENABLE_3V3FIX)
       ClockedSerial.print(F("Clock is running at "));
       ClockedSerial.print((clock == CS_16MHZ) ? 16UL : 8UL);
       ClockedSerial.println(F("MHz"));
-#else
+# else /* !ENABLE_3V3FIX */
       ClockedSerial.println(F("Dynamic clock speed (3V3FIX) is not enabled."));
-#endif
-    } else if (cmd == "GETVOLTS") {
-#if defined(ENABLE_VSELECT)
+# endif /* ENABLE_3V3FIX */
+    }
+    else if (cmd.substring(1, 8) == "ETVOLTS")
+    { // (G/S)ETVOLTS: Get and set the voltage.
+# if defined(ENABLE_VSELECT)
+      if (cmd != "GETVOLTS") {
+        switch(cmd.substring(9, 10).toInt()) {
+          case 3: setVoltage(VOLTS_SET_3V3); break;
+          case 5: setVoltage(VOLTS_SET_5V); break;
+        }
+      }
       ClockedSerial.print(F("Voltage is set to "));
       ClockedSerial.print((voltage == VOLTS_SET_5V) ? 5 : 3.3);
       ClockedSerial.println(F("V"));
-#else
+# else /* !ENABLE_VSELECT */
       ClockedSerial.println(F("Automatic voltage selection (VSELECT) is not enabled."));
-#endif
-    } else if (cmd == "GETTIME") {
-#if defined(RTC_installed)
-      ClockedSerial.print(F("Current Time: "));
-      ClockedSerial.println(RTCStamp());
-#else
-      ClockedSerial.println(F("RTC not installed"));
-#endif
-    } else if (cmd.substring(0, 7) == "SETTIME") {
-#if defined(RTC_installed)
-      ClockedSerial.println(F("Setting Time..."));
-      rtc.adjust(DateTime(cmd.substring(8).toInt()));
+# endif /* ENABLE_VSELECT */
+    }
+    // RTC commands
+    else if (cmd.substring(1, 7) == "ETTIME")
+    { // (G/S)ETTIME: Get and set the date/time.
+# if defined(RTC_installed)
+      if (cmd != "GETTIME") {
+        ClockedSerial.println(F("Setting Time..."));
+        rtc.adjust(DateTime(cmd.substring(8).toInt()));
+      }
       ClockedSerial.print(F("Current Time: "));
       ClockedSerial.println(RTCStamp());
-#else
+# else /* !RTC_installed */
       ClockedSerial.println(F("RTC not installed"));
-#endif
+# endif /* RTC_installed */
     } else {
       ClockedSerial.println(F("OSCR: Unknown Command"));
     }
diff --git a/Cart_Reader/Config.h b/Cart_Reader/Config.h
index 68080a90..47dce287 100644
--- a/Cart_Reader/Config.h
+++ b/Cart_Reader/Config.h
@@ -288,9 +288,30 @@
 
 /*==== FIRMWARE OPTIONS ===========================================*/
 
+/* [ Config File -------------------------------------------------- ]
+    Allow changing some configuration values via a config file. You
+    generally can only use the config to set options or disable
+    certain featuress. It cannot be used to toggle firmware options
+    on, only off.
+
+    Note For Developers: See OSCR.* for info.
+
+    Filename: config.txt
+*/
+
+//#define ENABLE_CONFIG
+
+/****/
+
 /* [ LCD: Background Color ---------------------------------------- ]
     Set the backlight color of the LCD if you have one.
 
+    Can be set using config:
+      lcd.confColor=1
+      lcd.red=0
+      lcd.green=0
+      lcd.blue=0
+
     PARAMETERS:
       Green, Red, Blue
 */
@@ -332,6 +353,9 @@
 
 /* [ Logging ------------------------------------------------------ ]
     Write all info to OSCR_LOG.txt in root dir
+
+    Can be toggled off using config:
+      oscr.logging=0
 */
 
 #define global_log
@@ -367,13 +391,26 @@
       0: Output each byte once. Not supported by emulators. (default)
       1: Duplicate each byte. Usable by Kega Fusion.
       2: Same as 1 + pad with 0xFF so that the file size is 64KB.
+
+    **
+    ** DEPRECATED: Use the config file instead. See below.
+    **
 */
 
 //#define use_md_conf
 
 /*
-    Alternatively, define it here by uncommenting and changing the
-    following line. Setting both allows you to change the default.
+    Configure how the MD core saves are formatted.
+
+    Can be set using config:
+      md.sramType=0
+
+    If config is enabled, this option does nothing -- use the config.
+
+    Options:
+      0: Output each byte once. Not supported by emulators. (default)
+      1: Duplicate each byte. Usable by Kega Fusion.
+      2: Same as 1 + pad with 0xFF so that the file size is 64KB.
 */
 
 //#define DEFAULT_VALUE_segaSram16bit 0
@@ -404,39 +441,47 @@
               You probably shouldn't change this stuff!
 */
 
+#if defined(ENABLE_CONFIG)
+# define CONFIG_FILE       "config.txt"
+// Define the max length of the key=value pairs
+// Do your best not to have to increase these.
+# define CONFIG_KEY_MAX    32
+# define CONFIG_VALUE_MAX  32
+#endif
+
 #if (defined(HW4) || defined(HW5))
-#define enable_LCD
-#define enable_neopixel
-#define enable_rotary
-//#define rotate_counter_clockwise
-#define clockgen_installed
-#define fastcrc
-#define ws_adapter_v2
+# define enable_LCD
+# define enable_neopixel
+# define enable_rotary
+//# define rotate_counter_clockwise
+# define clockgen_installed
+# define fastcrc
+# define ws_adapter_v2
 #endif
 
 #if (defined(HW2) || defined(HW3))
-#define enable_OLED
-#define enable_Button2
-#define clockgen_installed
-#define CA_LED
-#define fastcrc
+# define enable_OLED
+# define enable_Button2
+# define clockgen_installed
+# define CA_LED
+# define fastcrc
 #endif
 
 #if defined(HW1)
-#define enable_OLED
+# define enable_OLED
 //#define clockgen_installed
 //#define fastcrc
 #endif
 
 #if defined(SERIAL_MONITOR)
-#define enable_serial
+# define enable_serial
 //#define clockgen_installed
 //#define fastcrc
 #endif
 
 /* Firmware updater only works with HW3 and HW5 */
 #if !(defined(HW5) || defined(HW3))
-#undef ENABLE_UPDATER
+# undef ENABLE_UPDATER
 #endif
 
 /* End of settings */
diff --git a/Cart_Reader/MD.ino b/Cart_Reader/MD.ino
index a5585dcd..c6e7f3e4 100644
--- a/Cart_Reader/MD.ino
+++ b/Cart_Reader/MD.ino
@@ -87,11 +87,20 @@ unsigned long bramSize = 0;
 // REALTEC MAPPER
 boolean realtec = 0;
 
-#ifndef DEFAULT_VALUE_segaSram16bit
-#define DEFAULT_VALUE_segaSram16bit 0
-#endif
+#if defined(ENABLED_CONFIG)
+
+int segaSram16bit = 0;
+
+#else /* !ENABLED_CONFIG */
+
+# ifndef DEFAULT_VALUE_segaSram16bit
+#   define DEFAULT_VALUE_segaSram16bit 0
+# endif /* !DEFAULT_VALUE_segaSram16bit */
+
 int segaSram16bit = DEFAULT_VALUE_segaSram16bit;
 
+#endif /* ENABLED_CONFIG */
+
 //*****************************************
 // SONIC & KNUCKLES LOCK-ON MODE VARIABLES
 // SnKmode :
@@ -111,12 +120,15 @@ static word chksumSonic2 = 0x0635;
 /******************************************
    Configuration
  *****************************************/
-#ifdef use_md_conf
+#if defined(use_md_conf) && !defined(ENABLE_CONFIG)
+
+#warning "DEPRECATED: use_md_conf is deprecated. You should use ENABLE_CONFIG instead."
+
 void mdLoadConf() {
   if (myFile.open("mdconf.txt", O_READ)) {
     char line[64];
-    int n;
-    int i;
+    unsigned int n;
+    unsigned int i;
     while ((n = myFile.fgets(line, sizeof(line) - 1)) > 0) {
       // preprocess
       for (i = 0; i < n; i++) {
@@ -467,9 +479,11 @@ void setup_MD() {
   // Request 5V
   setVoltage(VOLTS_SET_5V);
 
-#ifdef use_md_conf
+#if defined(ENABLE_CONFIG)
+  segaSram16bit = configGetLong(F("md.sramType"));
+#elif defined(use_md_conf)
   mdLoadConf();
-#endif
+#endif /*ENABLE_CONFIG*/
 
   // Set Address Pins to Output
   //A0-A7
diff --git a/Cart_Reader/OSCR.cpp b/Cart_Reader/OSCR.cpp
index 1965180a..70b96be5 100644
--- a/Cart_Reader/OSCR.cpp
+++ b/Cart_Reader/OSCR.cpp
@@ -7,7 +7,10 @@
 *       Contains various enums, variables, etc, for the main program.
 *
 * PUBLIC FUNCTIONS :
-*       void    setClockScale( VOLTS )
+*       void    setClockScale( ClockScale )
+*       VOLTS   setVoltage( Voltage )
+*       long    configGetLong( Key, OnFailure )
+*       String  configGetStr( Key )
 *
 * NOTES :
 *       This file is a WIP, I've been moving things into it on my local working
@@ -32,6 +35,7 @@
 * CHANGES :
 *
 * REF NO    VERSION  DATE        WHO            DETAIL
+*           13.2     2024-02-29  Ancyker        Add config support
 *           12.5     2023-03-29  Ancyker        Initial version
 *
 *H*/
@@ -41,7 +45,7 @@
 /*==== VARIABLES ==================================================*/
 
 // Firmware Version
-char ver[5] = "13.1";
+char ver[5] = "13.2";
 
 // Clock speed
 unsigned long clock = CS_16MHZ;
@@ -49,6 +53,22 @@ unsigned long clock = CS_16MHZ;
 // Voltage
 VOLTS voltage = VOLTS_SET_5V;
 
+#if defined(ENABLE_CONFIG)
+
+FsFile configFile;
+bool useConfig = false;
+
+# if defined(global_log)
+// Logging
+bool loggingEnabled = true;
+# endif /* global_log */
+#else /* !ENABLE_CONFIG */
+# if defined(global_log)
+// Logging: Define it as true using a const instead.
+const bool loggingEnabled = true;
+# endif /* global_log */
+#endif /* ENABLE_CONFIG */
+
 /*==== /VARIABLES =================================================*/
 
 /*F******************************************************************
@@ -107,7 +127,8 @@ void printVersionToSerial() {}
 *
 * INPUTS :
 *       PARAMETERS:
-*           VOLTS   ClockScale              Clock scale
+*           VOLTS      ClockScale              Clock scale
+*           CLKSCALE   ClockScale              Clock scale
 *
 * PROCESS :
 *                   [1]  Enable clock prescaler change
@@ -139,6 +160,24 @@ void setClockScale(VOLTS __x)
   ); /*[2]*/
 }
 
+void setClockScale(CLKSCALE __x)
+{
+  clock = (__x == CLKSCALE_16MHZ ? CS_16MHZ : CS_8MHZ);
+  uint8_t __tmp = _BV(CLKPCE); /*[1]*/
+  __asm__ __volatile__ (
+    "in __tmp_reg__,__SREG__" "\n\t"
+    "cli" "\n\t"
+    "sts %1, %0" "\n\t"
+    "sts %1, %2" "\n\t"
+    "out __SREG__, __tmp_reg__"
+    : /* no outputs */
+    : "d" (__tmp),
+    "M" (_SFR_MEM_ADDR(CLKPR)),
+    "d" (__x)
+    : "r0"
+  ); /*[2]*/
+}
+
 /*F******************************************************************
 * NAME :            VOLTS setVoltage( Voltage )
 *
@@ -263,3 +302,146 @@ VOLTS setVoltage(VOLTS newVoltage __attribute__((unused))) {
   return VOLTS_NOTENABLED;
 }
 #endif
+
+#if defined(ENABLE_CONFIG)
+
+/*F******************************************************************
+* NAME :            void configInit()
+*
+* DESCRIPTION :     Setup the config file.
+*                   
+*F*/
+void configInit() {
+  useConfig = configFile.open(CONFIG_FILE, O_READ);
+}
+
+/*F******************************************************************
+* NAME :            uint8_t configFindKey( Key, Value )
+*
+* DESCRIPTION :     Search for a key=value pair.
+*
+* INPUTS :
+*       PARAMETERS:
+*           __FlashStringHelper   Key       The key to get the value for.
+*           char*                 value     Variable to store the value in.
+*
+* OUTPUTS :
+*       RETURN :
+*            Type:   uint8_t      Length of the value.
+*
+* PROCESS :
+*                   [1]  Get key length and convert to char array/string.
+*                   [2]  Parse file line by line.
+*                   [3]  Check if key in file matches.
+*                   [4]  Copy string after equals character.
+*                   [5]  Add null terminator.
+*
+* NOTES :
+*       You aren't meant to use this function directly. Check the
+*       functions configGetStr() and configGetLong().
+*
+*F*/
+uint8_t configFindKey(const __FlashStringHelper* searchKey, char* value) {
+  if (!useConfig) return 0;
+
+  char key[CONFIG_KEY_MAX + 1];
+  char buffer[CONFIG_KEY_MAX + CONFIG_VALUE_MAX + 4];
+  int keyLen = 0;
+  int valueLen = 0;
+
+  keyLen = strlcpy_P(key, reinterpret_cast<const char *>(searchKey), CONFIG_KEY_MAX); /*[1]*/
+
+  configFile.rewind();
+
+  while (configFile.available()) { /*[2]*/
+    int bufferLen = configFile.readBytesUntil('\n', buffer, CONFIG_KEY_MAX + CONFIG_VALUE_MAX + 3);
+
+    if (buffer[bufferLen - 1] == '\r')
+      bufferLen--;
+
+    if (bufferLen > (keyLen + 1)) {
+      if (memcmp(buffer, key, keyLen) == 0) { /*[3]*/
+        if (buffer[keyLen] == '=') { /*[4]*/
+          valueLen = bufferLen - keyLen - 1;
+          memcpy(&value[0], &buffer[keyLen + 1], valueLen);
+          value[valueLen] = '\0'; /*[5]*/
+          break;
+        }
+      }
+    }
+  }
+
+  return valueLen;
+}
+
+/*F******************************************************************
+* NAME :            String configGetStr( Key )
+*
+* DESCRIPTION :     Return the value of a key as a string.
+*
+* INPUTS :
+*       PARAMETERS:
+*           __FlashStringHelper   Key       The key to get the value for.
+*
+* OUTPUTS :
+*       RETURN :
+*            Type:   String       The value of the key or an empty string.
+*
+* PROCESS :
+*                   [1]  Find the key via configFindKey().
+*                   [2]  Return empty if nothing was found.
+*                   [3]  Convert to String type.
+*
+* NOTES :
+*       You can use this to get strings stored in the config file.
+*       Take care when allocating memory for strings. You should 
+*       probably use malloc for it if it's a global variable. If
+*       you do, make sure to free() it after it's not needed.
+*
+*F*/
+String configGetStr(const __FlashStringHelper* key) {
+  if (!useConfig) return {};
+  char value[CONFIG_VALUE_MAX + 1];
+  
+  uint8_t valueLen = configFindKey(key, value); /*[1]*/
+  if (valueLen < 1) return {}; /*[2]*/
+
+  String stringVal(value); /*[3]*/
+
+  return stringVal;
+}
+
+/*F******************************************************************
+* NAME :            long configGetLong( Key, OnFailure )
+*
+* DESCRIPTION :     Return the value of a key as an int/long.
+*
+* INPUTS :
+*       PARAMETERS:
+*           __FlashStringHelper   Key      The key to get the value for.
+*           int                   onFail   Value to return on failure. (def=0)
+*
+* OUTPUTS :
+*       RETURN :
+*            Type:   int          The value of the key or onFail.
+*
+* PROCESS :
+*                   [1]  Find the key via configFindKey().
+*                   [2]  Return onFail if nothing was found.
+*                   [3]  Convert to long int type and return.
+*
+* NOTES :
+*       You can specify hex, i.e. 0xFF for 255, if you want to.
+*
+*F*/
+long configGetLong(const __FlashStringHelper* key, int onFail) {
+  if (!useConfig) return onFail;
+  char value[CONFIG_VALUE_MAX + 1];
+
+  uint8_t valueLen = configFindKey(key, value); /*[1]*/
+  if (valueLen < 1) return onFail; /*[2]*/
+
+  return strtol(value, NULL, 0); /*[3]*/
+}
+
+#endif /* ENABLE_CONFIG */
diff --git a/Cart_Reader/OSCR.h b/Cart_Reader/OSCR.h
index 8b6e3506..5bbe99ea 100644
--- a/Cart_Reader/OSCR.h
+++ b/Cart_Reader/OSCR.h
@@ -10,6 +10,7 @@
 #include <Wire.h>
 #include <avr/pgmspace.h>
 #include <avr/wdt.h>
+#include "SdFat.h"
 
 #include "Config.h"
 
@@ -29,6 +30,13 @@ const uint16_t UPD_BAUD = 9600;
 const unsigned long CS_16MHZ = 16000000UL;
 const unsigned long CS_8MHZ = 8000000UL;
 
+// ENUM for VSELECT & 3V3FIX
+enum CLKSCALE: uint8_t {
+  // Paramters to pass to setVoltage() and setClockScale()
+  CLKSCALE_16MHZ = 0, // ClockScale 0 = 16MHz
+  CLKSCALE_8MHZ,      // ClockScale 1 = 8MHz
+};
+
 // ENUM for VSELECT & 3V3FIX
 enum VOLTS: uint8_t {
   // Paramters to pass to setVoltage() and setClockScale()
@@ -47,11 +55,37 @@ extern unsigned long clock;
 extern char ver[5];
 extern VOLTS voltage;
 
+#if defined(ENABLE_CONFIG)
+  /**
+   * Config File Stuff
+   *
+   * You can register GLOBAL configuration variables in this section.
+   * You should put core-specific config variables in the related file.
+   **/
+
+  extern bool useConfig;
+# ifdef global_log
+  extern bool loggingEnabled;
+# endif /* global_log */
+#else /* !ENABLE_CONFIG */
+# ifdef global_log
+  extern const bool loggingEnabled;
+# endif /* global_log */
+#endif /* ENABLE_CONFIG */
+
 /*==== FUNCTIONS ==================================================*/
 extern void printVersionToSerial();
 extern void setClockScale(VOLTS __x);
+extern void setClockScale(CLKSCALE __x);
 extern VOLTS setVoltage(VOLTS volts);
 
+#if defined(ENABLE_CONFIG)
+extern void configInit();
+extern uint8_t configFindKey(const __FlashStringHelper* key, char* value);
+extern String configGetStr(const __FlashStringHelper* key);
+extern long configGetLong(const __FlashStringHelper* key, int onFail = 0);
+#endif /* ENABLE_CONFIG */
+
 #include "ClockedSerial.h"
 
 #endif /* OSCR_H_ */
diff --git a/sd/config.txt b/sd/config.txt
new file mode 100644
index 00000000..30fcf4cc
--- /dev/null
+++ b/sd/config.txt
@@ -0,0 +1,6 @@
+oscr.logging=1
+lcd.confColor=0
+lcd.red=0
+lcd.green=100
+lcd.blue=0
+md.sramType=0