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converter/ibm4704_usb/4704.txt
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| 4704 Keyboard Protocol | 4704 Keyboard Protocol | ||||
| ====================== | ====================== | ||||
| On powering up the keyboard sends keyboard id; A3h for 6019284(62-key), for example. | On powering up the keyboard sends keyboard id; A3h for 6019284(62-key), for example. | ||||
| so that it doesn't send any scancode until you send 'FF'(End of FC command). | 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 | Keyboard to Host | ||||
| ---------------- | ---------------- | ||||
| Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part. | Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part. | ||||
| Stop bit: Keyboard pulls down Data line to lo after 9th clock. | Stop bit: Keyboard pulls down Data line to lo after 9th clock. | ||||
| Host to Keyboard | Host to Keyboard | ||||
| ---------------- | ---------------- | ||||
| Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part. | Data bits are LSB first and Pairty is odd. Clock has around 60us high and 30us low part. | ||||
| Stop bit: Host releases or pulls up Data line to hi after 9th clock and waits for keybaord pull down the line to lo. | 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 | Scancodes | ||||
| --------- | --------- | ||||
| Keyboard doesn't send Break code for all keys except for Alt by default. | Keyboard doesn't send Break code for all keys except for Alt by default. |
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