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+PS/2 to USB keyboard converter
+==============================
+This firmware converts PS/2 keyboard protocol to USB.(It supports Scan Code Set 2.)
+
+
+Connect Wires
+-------------
+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.
+
+
+Build Firmware
+--------------
+For **PJRC Teensy** just run `make`:
+
+    $ make clean
+    $ make
+
+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`.
+
+
+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)