PC98 to USB keyboard protocol converter

TMK Keyboard protocol converter for NEC PC-9801 series that allows you to use PC-9801 keyboard on modern USB PC.

Main target is TMK prebuilt converter(ATMega32u2) but it will work on dev boards with ATMega32u4.

You can buy TMK prebuilt converter here to support this project.

Discuss or report issue on github or this thread. See this wiki page for PC98 keyboard technical infos.

Connector

On host/converter:

8Pin mini DIN
   ___ ___
  /  |_|  \
 / 8  7  6 \
| 5    4  3 |
 \_ 2   1 _/
   \_____/
 (receptacle)


Pin mini DIN        AVR Pins
----------------------------------
1  ~RST(TXD)        PD3
2   GND             GND
3  ~RDY             PD4
4   RXD             PD2
5  ~RTY             PD1
6   NC
7   NC
8   5V              VCC

Prebilt Firmware

Prebuilt firmware HEX files are available under 'binary' directory.

Build Firmware

TMK PC98 Converter

Just use 'make' to bild firmware for TMK PC98 converter(ATMega32u2).

$ make clean
$ make

To flash firmware run this command

$ make dfu

then push button on the converter to flash firmware.

Ohter boards

If you are using ATMega32u4 based board use following commands to get firmware HEX file.

$ make -f Makefile.32u4 clean
$ make -f Makefile.32u4

And flash it on your board using specific program method.

Raku Raku keyboard support

This is not supported actively anymore.

NEC PC-9801-98-S02 - raku raku keyboard: https://deskthority.net/photos-f62/nec-pc-9801-98-s02-t5212.html

To build firmware for the keyboard

$ make KEYMAP=rakuraku clean
$ make KEYMAP=rakuraku
$ make KEYMAP=rakuraku dfu

Its scan code map is very different from standard types. See unimap_trans.h and unimap_rakuraku.c.

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