tmk
10 years ago
1 changed files with 16 additions and 3 deletions
+ 16
- 3
converter/ibm4704_usb/4704.txt
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| @@ -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. | |||