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+X68000 to USB keyboard protocol converter
+=========================================
+SHARP X68000 is a hobby computer released in Japan.(1987-93)
+http://en.wikipedia.org/wiki/Sharp_X68000
+
+X68000 keyboard has ALPS linear switches.
+- DSETK0016CE01   green linear
+- DSETK0023CE03   yellow linear
+
+
+Hardware
+--------
+Target MCU is ATMega32u4 but other USB capable AVR will also work.
+You can use PJRC Teensy as dev board.
+    http://www.pjrc.com/teensy/
+
+Wiring:
+    Mini-DIN            Teensy
+    -----------------------------------------------------
+    pin1   +5V          VCC
+    pin2   MOUSE        -
+    pin3   RXD          PD2(RXD)
+    pin4   TXD          PD3(TXD) NOTE: Not supported yet.
+    pin5   READY        -
+    pin6   REMOTE       -
+    pin7   GND          GND
+
+
+Firmware
+--------
+Build:
+    $ cd x68k_usb
+    $ make
+
+And load the binary to MCU with your favorite programmer.
+If you use Teensy you can load with PJRC Teensy Loader tool.
+    http://www.pjrc.com/teensy/loader.html
+
+
+*   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
+
+
+X68000 Keyboard Protocol
+========================
+http://kyoutan.jpn.org/uts/pc/pic/x68key/
+
+
+Connector
+---------
+Mini DIN 7pin(female connector on computer side)
+       7 6 5
+       o o o
+    4 o  =  o 3
+        o o
+        2 1
+
+    Mini-DIN
+    -------------
+    pin1   +5V
+    pin2   MOUSE
+    pin3   RXD
+    pin4   TXD
+    pin5   READY
+    pin6   REMOTE
+    pin7   GND
+
+
+Signaling
+---------
+- TXD,RXD
+    Asynchronous, 2400baud, 1-startbit(L), 8-databit, 1-stopbit(H)
+
+- READY
+    ready/not ready(1/0)
+
+
+Data from keyboard
+------------------
+bit 7       make/break flag(0/1)
+bit 6-0     following scan code
+
+
+Data from computer
+------------------
+- LED contorol ON/OFF(0/1)
+    bit 7   1(fixed)
+    bit 6   全角
+    bit 5   ひらがな
+    bit 4   INS
+    bit 3   CAPS
+    bit 2   コード入力
+    bit 1   ローマ字
+    bit 0   かな
+
+- Repeat delay
+    bit 7   0(fixed)
+    bit 6   1(fixed)
+    bit 5   1(fixed)
+    bit 4   0(fixed)
+    bit 3-0 delay
+    REPEAT_DELAY = 200+delay*100 ms
+    default: 500ms
+ 
+-  Repeat time
+    bit 7   0(fixed)
+    bit 6   1(fixed)
+    bit 5   1(fixed)
+    bit 4   1(fixed)
+    bit 3-0 time
+    REPEAT_TIME = 30+time^2*5 ms
+    default: 110ms
+
+
+Scan Codes
+----------
+,---. ,---.    ,-------------------,    ,-------------------.  ,-----------. ,---------------.
+| 61| | 62|    | 63| 64| 65| 66| 67|    | 68| 69| 6A| 6B| 6C|  | 5A| 5B| 5C| | 5D| 52| 53| 54|
+`---' `---'    `-------------------'    `-------------------'  `-----------' `---------------'
+,-----------------------------------------------------------.  ,-----------. ,---------------.
+| 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E| 0F|  | 36| 5E| 37| | 3F| 40| 41| 42|
+|-----------------------------------------------------------|  |------------ |---------------|
+|  10 | 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| 1C|     |  | 38| 39| 3A| | 43| 44| 45| 46|
+|------------------------------------------------------. 1D |  `---=====---' |---------------|
+|  71  | 1E| 1F| 20| 21| 2l| 23| 24| 25| 26| 27| 28| 29|    |   ___| 3C|___  | 47| 48| 49| 4A|
+|-----------------------------------------------------------|  | 3B|---| 3D| |-----------|---|
+|  70    | 2A| 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34|   70 |  `---| 3E|---' | 4B| 4C| 4D|   |
+`-----------------------------------------------------------|  .---=====---. |-----------| 4E|
+       | 5F| 55 | 56 |     35     | 57 | 58 | 59 | 60|         |  72 |  73 | | 4F| 50| 51|   |
+       `---------------------------------------------'         `-----------' `---------------'