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qmk_firmware/converter/ibm4704_usb
History
tmk b4e2d325f3 Change TOP_DIR to TMK_DIR in makefiles 10 years ago
..
Makefile Change TOP_DIR to TMK_DIR in makefiles 10 years ago
README.md Fix markdown syntax 11 years ago
config.h Change IS_COMMAND macro 11 years ago
ibm4704.txt Fix README.md and ibm4704.txt 11 years ago
keymap_common.c Change key_t to keypos_t 10 years ago
keymap_common.h Add keymap_hasu.c 11 years ago
keymap_hasu.c Add keymap_hasu.c 11 years ago
keymap_plain.c Change keymap_plain.c 11 years ago
led.c Add Initial files of 4704_usb 11 years ago
matrix.c Tweak keyboard initialize 11 years ago

README.md

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.

Supported Keyboard

IBM capacitive switch models:

Alps switch(vintage Green) models:

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