@ -2,10 +2,12 @@ IBM 4704 to USB keyboard converter
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This firmware converts IBM 4704 keyboard protocol to USB HID.
This firmware converts IBM 4704 keyboard protocol to USB HID.
Keyboard initialization process takes a few seconds at start up. During that you will hear buzzer from the keyboard. **You need to plug USB cable after hooking up your keyboard to the converter.**
4704 Connector
4704 Connector
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Keyboard Plug from front
Keyboard Plug from front:
DSUB-9
DSUB-9
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@ -24,7 +26,7 @@ Connection
In case of using ATMega32U4(Teensy2.0):
In case of using ATMega32U4(Teensy2.0):
1. Supply power with VCC and GND.
1. Supply power with VCC and GND.
2. Connect CLOCK to PD1 and DATA to PD2. You can change pin with config.h.
2. Connect CLOCK to PD1 and DATA to PD0. You can change pin with config.h.
3. Optionally you may need pull-up register. 1KOhm probably work.
3. Optionally you may need pull-up register. 1KOhm probably work.