IBM 4704 to USB keyboard converter ================================== This firmware converts IBM 4704 keyboard protocol to USB HID. 4704 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. Connection ---------- In case of using ATMega32U4(Teensy2.0): 1. Supply power with VCC and GND. 2. Connect CLOCK to PD1 and DATA to PD2. You can change pin with config.h. 3. Optionally you may need pull-up register. 1KOhm probably work. Build Firmware -------------- Just run `make`: $ make To select keymap: $ make KEYMAP=[plain|...] Keymap ------ Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_.c` and see keymap document(you can find in top README.md) and existent keymap files.