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-ADB Protocol
-============
-
-Resources
----------
-ADB - The Untold Story: Space Aliens Ate My Mouse
-    http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html
-Apple IIgs Hardware Reference Second Edition [p80(Chapter6 p121)]
-    ftp://ftp.apple.asimov.net/pub/apple_II/documentation/Apple%20IIgs%20Hardware%20Reference.pdf
-ADB Keycode
-    http://72.0.193.250/Documentation/macppc/adbkeycodes/
-    http://m0115.web.fc2.com/m0115.jpg
-    [Inside Macintosh volume V, pages 191-192]
-ADB Signaling
-    http://kbdbabel.sourceforge.net/doc/kbd_signaling_pcxt_ps2_adb.pdf
-ADB Overview & History
-    http://en.wikipedia.org/wiki/Apple_Desktop_Bus
-Microchip Application Note: ADB device(with code for PIC16C)
-    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011062
-AVR ATtiny2131 ADB to PS/2 converter(Japanese)
-    http://hp.vector.co.jp/authors/VA000177/html/KeyBoardA5DEA5CBA5A2II.html
-
-
-Pinouts
--------
-    ADB female socket from the front:
-    __________
-    |        | <--- top
-    | 4o  o3 |
-    |2o    o1|
-    |   ==   |
-    |________| <--- bottom
-      |    |   <--- 4pins
-
-
-    ADB female socket from bottom:
-
-    ========== <--- front
-    |        |
-    |        |
-    |2o    o1|
-    |4o    o3|
-    ---------- <--- back
-
-    1: Data
-    2: Power SW(low when press Power key)
-    3: Vcc(5V)
-    4: GND
-
-
-
-Commands
---------
-    ADB command is 1byte and consists of 4bit-address, 2bit-command
-    type and 2bit-register. The commands are always sent by Host.
-
-    Command format:
-    7 6 5 4 3 2 1 0
-    | | | |------------ address
-            | |-------- command type
-                | |---- register
-
-    bits                commands
-    ------------------------------------------------------
-    - - - - 0 0 0 0     Send Request(reset all devices)
-    A A A A 0 0 0 1     Flush(reset a device)
-    - - - - 0 0 1 0     Reserved
-    - - - - 0 0 1 1     Reserved
-    - - - - 0 1 - -     Reserved
-    A A A A 1 0 R R     Listen(write to a device)
-    A A A A 1 1 R R     Talk(read from a device)
-
-    The command to read keycodes from keyboard is 0x2C which
-    consist of keyboard address 2 and Talk against register 0. 
-
-    Address:
-    2:  keyboard
-    3:  mice
-
-    Registers:
-    0: application(keyobard uses this to store its data.)
-    1: application
-    2: application(keyboard uses this for LEDs and state of modifiers)
-    3: status and command
-
-
-Communication
--------------
-    This is a minimum information for keyboard communication.
-    See "Resources" for detail.
-
-    Signaling:
-
-    ~~~~____________~~||||||||||||__~~~~~_~~|||||||||||||||__~~~~
-
-        |800us     |  |7 Command 0|  |   |  |15-64  Data  0|Stopbit(0)
-        +Attention |              |  |   +Startbit(1)
-                   +Startbit(1)   |  +Tlt(140-260us)
-                                  +stopbit(0)
-
-    Bit cells:
-
-    bit0: ______~~~
-          65    :35us
-
-    bit1: ___~~~~~~
-          35 :65us
-
-    bit0 low time: 60-70% of bit cell(42-91us)
-    bit1 low time: 30-40% of bit cell(21-52us)
-    bit cell time: 70-130us
-    [from Apple IIgs Hardware Reference Second Edition]
-
-    Criterion for bit0/1:
-    After 55us if line is low/high then bit is 0/1.
-
-    Attention & start bit:
-    Host asserts low in 560-1040us then places start bit(1).
-
-    Tlt(Stop to Start):
-    Bus stays high in 140-260us then device places start bit(1).
-
-    Global reset:
-    Host asserts low in 2.8-5.2ms. All devices are forced to reset.
-
-    Send request from device(Srq):
-    Device can request to send at commad(Global only?) stop bit.
-    keep low for 300us to request.
-
-
-Keyboard Data(Register0)
-    This 16bit data can contains two keycodes and two released flags.
-    First keycode is palced in upper byte. When one keyocode is sent,
-    lower byte is 0xFF.
-    Release flag is 1 when key is released.
-
-    1514 . . . . . 8 7 6 . . . . . 0
-     | | | | | | | | | +-+-+-+-+-+-+-   Keycode2
-     | | | | | | | | +---------------   Released2(1 when the key is released)
-     | +-+-+-+-+-+-+-----------------   Keycode1
-     +-------------------------------   Released1(1 when the key is released)
-
-    Keycodes:
-    Scancode consists of 7bit keycode and 1bit release flag.
-    Device can send two keycodes at once. If just one keycode is sent
-    keycode1 contains it and keyocode2 is 0xFF.
-
-    Power switch:
-    You can read the state from PSW line(active low) however
-    the switch has a special scancode 0x7F7F, so you can
-    also read from Data line. It uses 0xFFFF for release scancode.
-
-Keyboard LEDs & state of keys(Register2)
-    This register hold current state of three LEDs and nine keys.
-    The state of LEDs can be changed by sending Listen command.
-    
-    1514 . . . . . . 7 6 5 . 3 2 1 0
-     | | | | | | | | | | | | | | | +-   LED1(NumLock)
-     | | | | | | | | | | | | | | +---   LED2(CapsLock)
-     | | | | | | | | | | | | | +-----   LED3(ScrollLock)
-     | | | | | | | | | | +-+-+-------   Reserved
-     | | | | | | | | | +-------------   ScrollLock
-     | | | | | | | | +---------------   NumLock
-     | | | | | | | +-----------------   Apple/Command
-     | | | | | | +-------------------   Option
-     | | | | | +---------------------   Shift
-     | | | | +-----------------------   Control
-     | | | +-------------------------   Reset/Power
-     | | +---------------------------   CapsLock
-     | +-----------------------------   Delete
-     +-------------------------------   Reserved
-
-END_OF_ADB