diff --git a/.gitignore b/.gitignore
index f3f46872..0d87fe42 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ tags
 *~
 build/
 *.bak
+.DS_Store
diff --git a/converter/xt_usb/README.md b/converter/xt_usb/README.md
index 74464e26..b9641a03 100644
--- a/converter/xt_usb/README.md
+++ b/converter/xt_usb/README.md
@@ -1,6 +1,6 @@
-PS/2 to USB keyboard converter
+XT to USB keyboard converter
 ==============================
-This firmware converts PS/2 keyboard protocol to USB.(It supports Scan Code Set 2.)
+This firmware converts XT keyboard protocol to USB.(It supports Scan Code Set 1.)
 
 
 Connect Wires
@@ -10,8 +10,6 @@ In case of Teensy2.0(ATMega32U4):
 1. Connect **Vcc** and **GND**.
 2. Connect **Clock** and **Data** line. 
     - **Interrupt**:   **Clock** is on `PD1` and **Data** on `PD0`.(Recommended. Soarer's converter compatible)
-    - **Busywait**:    **Clock** is on `PD1` and **Data** on `PD0`.
-    - **USART**:       **Clock** is on `PD5` and **Data** on `PD2`.
 3. Optionally you need pull-up resistor. 1K-10K Ohm is OK.
 
 To change pin configuration edit **config.h** and **Makefile**.
@@ -29,56 +27,10 @@ To select keymap:
     $ make clean
     $ make KEYMAP=[plain|jis|spacefn|...]
 
-After that you will find HEX file `ps2_usb_lufa.hex` in current directory.
-
-
-- For **TMK converter Rev.1** use `make -f Makefile.tmk_rev1` instead of `make` and HEX file is `ps2_usb_tmk_rev1.hex`.
-
-- For **TMK converter Rev.2** use `make -f Makefile.tmk_rev2` instead of `make` and HEX file is `ps2_usb_tmk_rev2.hex`.
+After that you will find HEX file `xt_usb_lufa.hex` in current directory.
 
 
 Keymap
 ------
 Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_<name>.c` and see keymap document(you can find in README.md of top directory) and existent keymap files.
 
-
-PS/2 signal handling implementations
-------------------------------------
-Following three methods can be used to implement PS/2 signal handling.
-
-### Simple and stupid busy-wait(ps2_busywait.c)
-    This is expected to implemented with portable C code for reference.
-### Interrupt driven(ps2_interrupt.c)
-    Uses pin interrupt to detect falling edge of clock line.
-### USART hardware module(ps2_usart.c)
-    Uses AVR USART engine to receive PS/2 signal.
-
-To select method edit Makefile.
-
-
-V-USB Support
--------------
-With V-USB you can use this converter on ATmega(168/328) but it doesn't support NKRO at this time.
-
-Circuit:
-
-                    +---+   +---------------+
-    USB            GND  |   |   ATmega168   |
-    ===                 C3  |               |
-    5V <-------+--------+---|Vcc,AVCC       |        PS/2
-               R1           |               |        ====
-    D- <----+--+-----R2-----|INT1        RXD|------->DATA
-    D+ <----|---+----R3-----|INT0        XCK|------->CLOCK
-            Z1  Z2          |               |      ->5V
-    GND<----+---+--+--+-----|GND            |      ->GND
-                   |  |     |               |
-                   |  C2-+--|XTAL1          |
-                   |     X1 |               |
-                   +--C3-+--|XTAL2          |
-                            +---------------+
-    R1:     1.5K Ohm
-    R2,R3:  68 Ohm
-    Z1,Z2:  Zenner 3.6V
-    C1,C2:  22pF
-    C3:     0.1uF
-    X1:     Crystal 20MHz(16MHz/12MHz)