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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| |
+ `---------------------------------------------' `-----------' `---------------'