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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
-- DSETK0022CE02   yellow linear
-- DSETK0023CE03   yellow linear
-
-
-Hardware
---------
-Target MCU is ATMega32u4 but other USB capable AVR will also work.
-You can use PJRC Teensy as development 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 control 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|   |
-       `---------------------------------------------'         `-----------' `---------------'
-
-
-
-LED Special Functions
----------------------
-http://homepage2.nifty.com/m_kamada/docs/unlistedx68k.htm#keyboard
-
-1. Random Illumination
-    Plug in with pressing F1, F2 and F3.
-
-2. Sequential Illumination
-    Plug in with pressing 記号入力(52), 登録(53) and HELP.
-
-3. Scan code Display
-    Plug in with pressing かな(5A), ローマ字(5B) and コード入力(5C).
-    You can see its scan code on LEDs by pressing a key.
-   +---------------------------------------------------+
-   |bit|6   |5       |4  |3   |2         |1       |0   |
-   |---+----+--------+---+----+----------+--------+----|
-   |LED|全角|ひらがな|INS|CAPS|コード入力|ローマ字|かな|
-   +---------------------------------------------------+