tmk d5482f29f4 Fix debug print %!s(int64=10) %!d(string=hai) anos
..
Makefile 7860d09914 Change TMK_DIR setting %!s(int64=10) %!d(string=hai) anos
README.md 7474e14d06 Fix markdown syntax %!s(int64=11) %!d(string=hai) anos
config.h d5482f29f4 Fix debug print %!s(int64=10) %!d(string=hai) anos
ibm4704.txt 5ea50bfb30 Add keymap codelet for 77-key and 107-key %!s(int64=10) %!d(string=hai) anos
keymap_common.c e2077cad45 Change key_t to keypos_t %!s(int64=10) %!d(string=hai) anos
keymap_common.h 5ea50bfb30 Add keymap codelet for 77-key and 107-key %!s(int64=10) %!d(string=hai) anos
keymap_hasu.c 0f827cf94c Add keymap_hasu.c %!s(int64=11) %!d(string=hai) anos
keymap_plain.c 776ccd3e67 Change keymap_plain.c %!s(int64=11) %!d(string=hai) anos
led.c ebe951a445 Add Initial files of 4704_usb %!s(int64=11) %!d(string=hai) anos
matrix.c d5482f29f4 Fix debug print %!s(int64=10) %!d(string=hai) anos

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.