IBM 4704 to USB keyboard converter ================================== 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.** Keyboard models --------------- IBM capacitive switch models: 6019273 Model 100 50-key (grid layout) http://kishy.dyndns.org/?p=977 6019284 Model 200 62-key Alpha(60% layout) http://kishy.dyndns.org/?p=894 6019303 Model 300 77-key Expanded Alpha http://kbtalking.cool3c.com/article/23272 6020218 Model 400 107-key Full key http://kishy.dyndns.org/?p=980 Alps switch(vintage Green) models: 5954339 Japanese 102-key http://deskthority.net/post87127.html#p87127 6112883 Japanese 102-key http://geekhack.org/index.php?topic=52888.msg1194489#msg1194489 6112884 Japanese 102-key http://geekhack.org/index.php?topic=50437.msg1193047#msg1193047 6341739 Chinese 102-key http://geekhack.org/index.php?topic=52888.msg1176566#msg1176566 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 PD0. 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.