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keychron_qmk_firmware/converter/ibm4704_usb/README.md
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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_<name>.c and see keymap document(you can find in top README.md) and existent keymap files.