diff --git a/Cart_Reader/Cart_Reader.ino b/Cart_Reader/Cart_Reader.ino
index d26fff0..ab40e7a 100644
--- a/Cart_Reader/Cart_Reader.ino
+++ b/Cart_Reader/Cart_Reader.ino
@@ -2,8 +2,8 @@
                     Cartridge Reader for Arduino Mega2560
 
    Author:           sanni
-   Date:             08-09-2019
-   Version:          3.8
+   Date:             20-09-2019
+   Version:          3.9
 
    SD  lib:         https://github.com/greiman/SdFat
    LCD lib:         https://github.com/adafruit/Adafruit_SSD1306
@@ -41,7 +41,7 @@
 **********************************************************************************/
 #include <SdFat.h>
 
-char ver[5] = "3.8";
+char ver[5] = "3.9";
 
 /******************************************
    Options
diff --git a/Cart_Reader/SMS.ino b/Cart_Reader/SMS.ino
index 61a5005..1f5e82e 100644
--- a/Cart_Reader/SMS.ino
+++ b/Cart_Reader/SMS.ino
@@ -51,15 +51,17 @@ void setup_SMS() {
   // Set Address Pins to Output
   //A0-A7
   DDRF = 0xFF;
-  //A8-A15
+  //A8-A14
   DDRK = 0xFF;
+  //A15
+  DDRH |= (1 << 3);
 
   // Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
   DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
   // CE(PL1)
   DDRL |= (1 << 1);
 
-  // Setting RST(PH0)  WR(PH5) OE(PH6) HIGH
+  // Setting RST(PH0) WR(PH5) OE(PH6) HIGH
   PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
   // CE(PL1)
   PORTL |= (1 << 1);
@@ -92,6 +94,7 @@ void writeByte_SMS(word myAddress, byte myData) {
   // Set address
   PORTF = myAddress & 0xFF;
   PORTK = (myAddress >> 8) & 0xFF;
+  PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
   // Output data
   PORTC = myData;
 
@@ -124,6 +127,7 @@ byte readByte_SMS(word myAddress) {
   // Set Address
   PORTF = myAddress & 0xFF;
   PORTK = (myAddress >> 8) & 0xFF;
+  PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
 
   __asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
 
diff --git a/README.md b/README.md
index 6da5911..ab94f6c 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ Be sure to check the guides in the [Wiki](https://github.com/sanni/cartreader/wi
 - Reads Game Boy Advance roms and reads/writes most of the save games(4K Eeprom, 64K Eeprom, Sram/Fram, SST39VF512 512K flash + MX29L010 1M flash)  
 - Reflashes some Chinese GBA repros with Intel 4000L0YBQ0, Macronix MX29GL128E or Fujitsu MSP55LV128 flashroms    
 - Reads Sega Mega Drive roms and reads/writes save games(Sram/Fram, Eeprom)    
+- Reads Sega Master System roms (only default mapper and no SRAM supported so far)     
 - Reads PC engine/TG16 (custom-made adapter needed)   
 - Programs Flashroms like 29F016, 29F032 and 29F033, 29F1601, 29F1610, 29L3211, 29LV160, 29LV320 and S29GL032M   
 - Programs 27C322 Eproms   
diff --git a/extras/pcb/26L6420_adapter.png b/extras/pcb/26L6420_adapter_schematics.png
similarity index 100%
rename from extras/pcb/26L6420_adapter.png
rename to extras/pcb/26L6420_adapter_schematics.png
diff --git a/extras/pcb/README.md b/extras/pcb/README.md
index adb5648..500234c 100644
--- a/extras/pcb/README.md
+++ b/extras/pcb/README.md
@@ -6,6 +6,10 @@
 
 ![image](https://dl.dropboxusercontent.com/s/z2atlcly642sewj/nes_adapter.png?dl=1)   
 
+#### sms_adapter.zip is an add-on for reading Sega Master System carts. You can order a 2.54mm 50pin SMS slot [here](https://www.aliexpress.com/item/32818469880.html).     
+
+![image](https://dl.dropboxusercontent.com/s/r6lavgoaccjtrz7/sms_adapter.png?dl=1)   
+
 #### flash_adapter.zip is an add-on for writing flashroms like the 29F032, 29L3211, 29LV160, [PCB thickness needs to be changed to 1.2mm](https://dl.dropboxusercontent.com/s/va1c72073cqfy90/pcb12.jpg?dl=1), this is very important or else it won't fit into the SNES slot.   
    
 ![image](https://dl.dropboxusercontent.com/s/afrfmiuwvmvg9px/flash_adapter.png?dl=1)   
diff --git a/extras/pcb/sms_adapter.zip b/extras/pcb/sms_adapter.zip
new file mode 100644
index 0000000..80cf482
Binary files /dev/null and b/extras/pcb/sms_adapter.zip differ
diff --git a/extras/pcb/sms_adapter_schematics.png b/extras/pcb/sms_adapter_schematics.png
new file mode 100644
index 0000000..9dc4439
Binary files /dev/null and b/extras/pcb/sms_adapter_schematics.png differ