+##Hardware
+You have some options for hardware. Development boards with USB AVR family(ATMega32U4, AT90USB1286) like Teensy will work while MegaAVR with V-USB library is also cheapear option for DIY.
+
+###1. TMK Alt Controller Board
+TMK designed [Keyboard Controller Board for HHKB Pro2(KiCad project)](https://github.com/tmk/HHKB_controller).
+See [this post](http://geekhack.org/index.php?topic=12047.msg948923#msg948923).
+
+
+###2. PJRC Teensy++ 2.0 connection
+ +---------------+
+ | Teensy++ |
+ | |
+ | | HHKB pro HHKB pro2
+ | | ~~~~~~~~ ~~~~~~~~~
+ | PB0-2|------->ROW (6-8) (5-7)
+ | PB3-5|------->COL (9-11) (8-10)
+ | PB6|------->ENABLE (12) (11)
+ | PE6|<-------KEY (4) (3)
+ | PE7|------->PREV (5) (4)
+ | |
+ | | 5V--- (1-3) (1-2)
+ | | GND--- (13-14) (12-13)
+ +---------------+
+
+- NOTE: PJRC [Teensy](http://www.pjrc.com/teensy/)
+[Teensy Loader]: http://www.pjrc.com/teensy/loader.html