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-IBM 4704 Keyboard
-=================
-IBM capacitive switch models:
-    6019273 Model 100 50-key (grid layout)      http://kishy.ca/?p=894
-    6019284 Model 200 62-key Alpha(60% layout)  http://kishy.ca/?p=894
-    6019303 Model 300 77-key Expanded Alpha     http://deskthority.net/photos-f62/ibm-6019303-t8502.html
-    6020218 Model 400 107-key Full key          http://kishy.ca/?p=894
-
-Alps switch(vintage Green) models:
-    5954339 Japanese 102-key    http://deskthority.net/post87127.html#p87127
-    6112883 Japanese 102-key    http://geekhack.org/index.php?topic=52888.msg1194489#msg1194489
-    6112884 Japanese 102-key    http://geekhack.org/index.php?topic=50437.msg1193047#msg1193047
-    6341739 Chinese 102-key     http://geekhack.org/index.php?topic=52888.msg1176566#msg1176566
-
-Resourse
---------
-The IBM 4704: lots of pictures and info
-http://kishy.dyndns.org/?p=648#more-648 
-
-Brochure:
-http://ed-thelen.org/comp-hist/IBM-ProdAnn/4700.pdf
-
-
-
-IBM 4704 Keyboard Protocol
-==========================
-On powering up keyboard sends keyboard ID; A3h for 6019284(62-key), for example.
-After that the keyboard enters FC command mode and waits for parameter data from host
-so that it doesn't send any scancode until you send 'FF'(End of FC command mode).
-
-    Keyboard                    ID
-    -------------------------------
-    Model 100 50-key            A2h
-    Model 200 62-key            A3h
-    Model 300 77-key            A4h
-    Model 400 107-key           A5h
-    Japanese/Chinese 102-key    A6h
-
-
-Connector
----------
-    Keyboard Plug from front
-
-    DSUB-9
-    -------------
-    \ N 2 3 4 5 /
-     \ N N N N /
-      ---------
-    2   GND
-    3   VCC 5V
-    4   DATA
-    5   CLOCK
-    N   No connection/No pin.
-
-
-Keyboard to Host
-----------------
-Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part.
-
-            ____       __   __   __   __   __   __   __   __   __   _______
-    Clock       \_____/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/
-                 ____ ____ ____ ____ ____ ____ ____ ____ ____ ____    
-    Data    ____/    X____X____X____X____X____X____X____X____X____X________
-                Start   0    1    2    3    4    5    6    7    P  Stop
-
-Start bit:  can be long as 300-350us.
-Inhibit:    Pull Data line down to inhibit keyboard to send.
-Timing:     Host reads bit while Clock is hi.(rising edge)
-Stop bit:   Keyboard pulls down Data line to lo after 9th clock.
-
-
-Host to Keyboard
-----------------
-Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part.
-
-            ____        __   __   __   __   __   __   __   __   __   ________
-    Clock       \______/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/  \_/
-                ^   ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___
-    Data    ____|__/    X____X____X____X____X____X____X____X____X____X   \___
-                |  Start   0    1    2    3    4    5    6    7    P   Stop
-                Request by host
-
-Start bit:  can be long as 300-350us.
-Request:    Host pulls Clock line down to request to send a command.
-Timing:     After Request keyboard pull up Data and down Clock line to low for start bit.
-            After request host release Clock line once Data line becomes hi.
-            Host wirtes a bit while Clock is hi and Keyboard reads while low.
-Stop bit:   Host releases or pulls up Data line to hi after 9th clock and waits for keybaord pull down the line to lo.
-
-
-Scancodes
----------
-Keyboard doesn't send Break code for all keys except for Alt by default.
-
-    6019284 62-key:
-    ,-----------------------------------------------------------.
-    |  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|???|BS |
-    |-----------------------------------------------------------|
-    |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P| ￠|  \|  PD2|
-    |-----------------------------------------------------------|
-    |Ctrl  |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '| {}| PD3|
-    |-----------------------------------------------------------|
-    |Shif| <>|  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|  /|???|Shift |
-    |-----------------------------------------------------------|
-    |Reset|blk|Alt  |         Space             |Alt  |blk|Enter|
-    `-----------------------------------------------------------'
-    +----------+---------------------+----------+----------+
-    |`       00|PD1     04|Caps    20|LShift  30|Reset   31|
-    |1       18|q       05|a       21|<>      3E|Rblank  41|
-    |2       19|w       06|s       22|z       32|Alt     3F|
-    |3       1A|e       13|d       23|x       33|Space   40|
-    |4       10|r       14|f       24|c       34|Alt     3F|
-    |5       11|t       15|g       25|v       35|Lblank  42|
-    |6       12|y       16|h       26|b       36|Enter   2F|
-    |7       08|u       17|j       27|n       37|          |
-    |8       09|i       01|k       28|m       38|          |
-    |9       0A|o       02|l       29|,       39|          |
-    |0       0F|p       03|;       2A|.       3A|          |
-    |-       1F|￠      1B|'       2B|/       3B|          |
-    |=       0D|\       1C|{}      2C|???     3C|          |
-    |???     0C|PD2     1D|PD3     2D|RShift  3D|          |
-    |BS      0E|          |          |          |          |
-    +----------+---------------------+----------+----------+
-    Bit7 is 'press flag' which set 1 on press and 0 on release when break code is enabled.
-
-NOTE: When break code is enabled the key sends scancode with setting 7th bit on press
-and without it on release. That is, '`' sends 80h on press and 00h on release.
-
-
-Keyboard command
-----------------
-Keyboard accepts these commands from host.
-
-        Description                             Entry point
-    -----------------------------------------------------------
-    FF  Soft Reset                              0008h
-    FE  Resend                                  00e8h
-    FD  Buzzer(emits a short beep)              00edh
-    FC  Set Key Flag                            00f6h
-    FB  Soft Reset                              0008h
-    FA  Reset                                   0000h
-    
-
-Keyboard response
------------------
-Keyobard sends these bytes to host.
-
-        Description                             Entry point
-    -----------------------------------------------------------
-    FE  Overflow(key event/receive data)        00c5h, 0346h
-        Memory test error                       0224h
-    FD  Command out of bound                    00d8h
-        Key out of bound
-    7E  Read/Parity error in receive from host  00bch
-
-
-Set Key Flag command(FC)
-------------------------
-After 'Power on Reset' firmware enters this command mode and waits for data from host,
-so that you don't need to send 'FC' and it doesn't send any scancode until you send 'FF'.
-
-Data sent from host:
-
-    bit: 7   6 ... 0
-         en  |     |
-         |   `-----`--- scan code
-         `------------- enable bit(0: enable repeat, 1: enable break)
-
-    00-79   Enable repeat
-    80-F9   Enable break(FA-FF are used as other commands, see above.)
-    FE      Resend(011ah) no need to use
-    FF      End(0114h) exits FC command mode.
-
-Response from keyboard:
-    FD      Out of bound - Invalid scancode
-    --      OK - No response means that command is accepted.
-
-Examples:
-    To enable break code of all keys.
-
-    FC 80 81 ... F7 FF
-