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+4704 Keyboard
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+=============
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+Keyboard Models:
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+ Model 100 6019273 50-key (grid layout)
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+ Model 200 6019284 62-key Alpha(60% layout)
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+ Model 300 6019303 77-key Expanded Alpha
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+ Model 400 6020218 107-key Full key
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+
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+Resourse
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+--------
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+The IBM 4704: lots of pictures and info
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+http://kishy.dyndns.org/?p=648#more-648
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+
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+Brochure:
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+http://ed-thelen.org/comp-hist/IBM-ProdAnn/4700.pdf
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+
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+
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+
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+
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+4704 Keyboard Protocol
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+======================
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+On powering up the keyboard sends keyboard id; A3h for 6019284(62-key), for example.
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+After that firmware enters FC command mode and waits for parameter data from host
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+so that it doesn't send any scancode until you send 'FF'(End of FC command).
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+
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+
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+Keyboard to Host
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+----------------
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+Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part.
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+
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+ ____ __ __ __ __ __ __ __ __ __ ________
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+ Clock \____/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
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+ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____
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+ Data ____/ X____X____X____X____X____X____X____X____X____X________
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+ Start 0 1 2 3 4 5 6 7 P Stop
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+
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+Start bit: can be long as 300-350us.
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+Inhibit: Pull Data line down to inhibit keyboard to send.
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+Timing: Host reads bit while Clock is hi.
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+Stop bit: Keyboard pulls down Data line to lo after 9th clock.
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+
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+
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+
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+Host to Keyboard
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+----------------
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+Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part.
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+
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+ ____ __ __ __ __ __ __ __ __ __ ________
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+ Clock \______/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
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+ ^ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___
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+ Data ____|__/ X____X____X____X____X____X____X____X____X____X \___
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+ | Start 0 1 2 3 4 5 6 7 P Stop
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+ Request by host
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+
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+Start bit: can be long as 300-350us.
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+Request: Host pulls Clock line down to request to send a command.
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+Timing: After Request keyboard pull up Data and down Clock line to low for start bit.
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+ After request host release Clock line once Data line becomes hi.
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+ Host wirtes a bit while Clock is hi and Keyboard reads while low.
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+Stop bit: Host releases or pulls up Data line to hi after 9th clock and waits for keybaord pull down the line to lo.
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+
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+
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+
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+Scancodes
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+---------
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+Keyboard doesn't send Break code for all keys except for Alt by default.
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+
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+ 6019284 62-key:
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+ ,-----------------------------------------------------------.
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+ | `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|???|BS |
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+ |-----------------------------------------------------------|
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+ |Tab | Q| W| E| R| T| Y| U| I| O| P| ￠| \| PD2|
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+ |-----------------------------------------------------------|
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+ |Ctrl | A| S| D| F| G| H| J| K| L| ;| '| {}| PD3|
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+ |-----------------------------------------------------------|
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+ |Shif| <>| Z| X| C| V| B| N| M| ,| ,| /|???|Shift |
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+ |-----------------------------------------------------------|
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+ |Reset|blk|Alt | Space |Alt |blk|Enter|
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+ `-----------------------------------------------------------'
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+ +----------+---------------------+----------+----------+
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+ |` 00|PD1 04|Caps 20|LShift 30|Reset 31|
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+ |1 18|q 05|a 21|<> 3E|Rblank 41|
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+ |2 19|w 06|s 22|z 32|Alt 3F|
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+ |3 1A|e 13|d 23|x 33|Space 40|
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+ |4 10|r 14|f 24|c 34|Alt 3F|
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+ |5 11|t 15|g 25|v 35|Lblank 42|
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+ |6 12|y 16|h 26|b 36|Enter 2F|
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+ |7 08|u 17|j 27|n 37| |
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+ |8 09|i 01|k 28|m 38| |
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+ |9 0A|o 02|l 29|, 39| |
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+ |0 0F|p 03|; 2A|. 3A| |
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+ |- 1F|￠ 1B|' 2B|/ 3B| |
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+ |= 0D|\ 1C|{} 2C|??? 3C| |
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+ |??? 0C|PD2 1D|PD3 2D|RShift 3D| |
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+ |BS 0E| | | | |
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+ +----------+---------------------+----------+----------+
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+ Bit7 is 'press flag' which set 1 on press and 0 on release when break code is enabled.
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+
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+NOTE: When break code is enabled the key sends scancode with setting 7th bit on press
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+and without it on release. That is, '`' sends 80h on press and 00h on release.
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+
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+
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+keyboard command
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+----------------
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+ FF Soft Reset(0008h)
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+ FE Resend(00e8h)
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+ FD Buzzer stop?(00edh)
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+ FC Set Key flag(00f6h)
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+ FB Soft Reset(0008h)
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+ FA Reset(0000h)
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+
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+
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+Keyboard response
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+-----------------
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+ FF Not exist. [Outgoing buffer cannot have FFh(00h in fact)]
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+ FE Overflow(key event/receive data) at 00c5h, 0346h
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+ FE Memory test error at 0224h
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+ FD Command out of bound at 00d8h
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+ Key out of bound
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+ 7E Read/Parity error in receive from host at 00bch
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+
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+
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+Set Key flag command(FC)
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+------------------------
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+After 'Power on Reset' firmware enters this command mode and waits for data from host,
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+so that you don't need to send 'FC' and it doesn't send any scancode until you send 'FF'.
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+
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+Data sent from host:
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+
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+ bit: 7 6 ... 0
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+ en | |
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+ | `-----`--- scan code
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+ `------------- enable bit(0: enable repeat, 1: enable break)
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+
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+ 00-77 Enable repeat(78-7F: invalid scancode)
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+ 80-F7 Enable break(F8-FF: invalid scancode)
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+ FE Resend(011ah) no need to use
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+ FF End(0114h) exits FC command mode.
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+
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+Response from keyboard:
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+ FD Out of bound - Invalid scancode
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+
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+Examples:
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+ To enable break code of all keys.
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+
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+ FC 80 81 ... F7 FF
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+
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tmk