Add connector pinouts

master
tmk 2014-02-10 23:49:57 +09:00
parent 902afcc509
commit 47d812bfd6
1 changed files with 16 additions and 3 deletions

View File

@ -16,7 +16,6 @@ http://ed-thelen.org/comp-hist/IBM-ProdAnn/4700.pdf
4704 Keyboard Protocol
======================
On powering up the keyboard sends keyboard id; A3h for 6019284(62-key), for example.
@ -24,6 +23,22 @@ After that firmware enters FC command mode and waits for parameter data from hos
so that it doesn't send any scancode until you send 'FF'(End of FC command).
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.
@ -40,7 +55,6 @@ Timing: Host reads bit while Clock is hi.
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.
@ -60,7 +74,6 @@ Timing: After Request keyboard pull up Data and down Clock line to low for s
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.