Keyboard firmwares for Atmel AVR and Cortex-M

tmk a88ad58342 core: Swap position of PEQL and PENT in unimap		pirms 7 gadiem
..
binary	ibm4707_usb: unimap	pirms 7 gadiem
Makefile	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.rev1	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.rev2	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.unimap.alps.rev1	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.unimap.alps.rev2	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.unimap.rev1	ibm4707_usb: unimap	pirms 7 gadiem
Makefile.unimap.rev2	ibm4707_usb: unimap	pirms 7 gadiem
README.md	ibm4707_usb: unimap	pirms 7 gadiem
config.h	ibm4704_usb: Fix protocol handling	pirms 9 gadiem
ibm4704.txt	ibm4704_usb: Fix scan code range for Alps 102-key	pirms 8 gadiem
keymap_50key.c	Fix: Use action_t in keymap files	pirms 7 gadiem
keymap_alps102key.c	Fix: Use action_t in keymap files	pirms 7 gadiem
keymap_common.h	Remove keymap read code from project directories	pirms 7 gadiem
keymap_hasu.c	Fix: Use action_t in keymap files	pirms 7 gadiem
keymap_plain.c	Fix: Use action_t in keymap files	pirms 7 gadiem
led.c	Add Initial files of 4704_usb	pirms 10 gadiem
matrix.c	Fix matrix.c to use new default impl.	pirms 7 gadiem
unimap_plain.c	core: Swap position of PEQL and PENT in unimap	pirms 7 gadiem
unimap_trans.h	core: Swap position of PEQL and PENT in unimap	pirms 7 gadiem

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. You may need to plug USB cable after hooking up your keyboard to the converter.

TMK Converter for IBM4704 is available here: https://geekhack.org/index.php?topic=72052.0

Update

2016/09/30 Unimap editor support
2015/09/07 Added keymap for Alps 102-key. Thanks, tai @ geekhack!
2015/05/05 Added keymaps for 107-key, 77-key and 50-key. Thanks, orihalcon @ geekhack!
2015/05/19 Fixed a protocol handling bug.

Supported Keyboard

IBM capacitive switch models:

6019273 Model 100 50-key (grid layout) http://kishy.ca/?p=894
6019284 Model 200 62-key Alpha(60% layout) http://kishy.ca/?p=894
6019303 Model 300 77-key Expanded Alpha http://deskthority.net/photos-f62/ibm-6019303-t8502.html
6020218 Model 400 107-key Full key http://kishy.ca/?p=894

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/U2

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.

TMK Converter can supports IBM 4704. https://github.com/tmk/keyboard_converter

Build Firmware

Just run make:

$ make -f <makefile>

For TMK Converter rev.1 use Makefile.rev1 as makefile:

$ make -f Makefile.rev1

For TMK Converter rev.2 use Makefile.rev2 as makefile:

$ make -f Makefile.rev2

To select keymap:

$ make -f <makefile> KEYMAP=[plain|alsp102key|...]

To indentify your TMK Converter revision see this.

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.

Use KEYMAP_ALPS102() to define your keymap for Alps models.