History

tmk 01f02e8457 Change IS_COMMAND macro		2014-02-17 16:41:40 +09:00
..
Makefile	Add keymap_hasu.c	2014-02-10 10:01:42 +09:00
README.md	Change pin configuration	2014-02-11 00:37:19 +09:00
config.h	Change IS_COMMAND macro	2014-02-17 16:41:40 +09:00
ibm4704.txt	Rename a file	2014-02-13 09:33:34 +09:00
keymap_common.c	Add Initial files of 4704_usb	2014-02-09 02:42:17 +09:00
keymap_common.h	Add keymap_hasu.c	2014-02-10 10:01:42 +09:00
keymap_hasu.c	Add keymap_hasu.c	2014-02-10 10:01:42 +09:00
keymap_plain.c	Change keymap_plain.c	2014-02-11 01:55:49 +09:00
led.c	Add Initial files of 4704_usb	2014-02-09 02:42:17 +09:00
matrix.c	Tweak keyboard initialize	2014-02-09 08:25:23 +09:00

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.

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):

Supply power with VCC and GND.
Connect CLOCK to PD1 and DATA to PD0. You can change pin with config.h.
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.