qmk_firmware

History

tmk 7860d09914 Change TMK_DIR setting		2015-04-10 01:53:24 +09:00
..
Makefile	Change TMK_DIR setting	2015-04-10 01:53:24 +09:00
README	Fix description of pin usage	2014-04-25 15:16:12 +09:00
config.h	Fix legacy keymap support	2013-03-11 14:39:06 +09:00
keymap.c	Change key_t to keypos_t	2014-11-24 15:14:52 +09:00
led.c	…
matrix.c	Rename file layer_switch to action_layer	2013-04-02 17:44:24 +09:00

README

PC98 to USB keyboard protocol converter
=======================================
Target MCU is ATMega32u4 but other USB capable AVR will also work.


Connector
---------

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


Wiring: You can change this with editing config.h.

    Pin mini DIN        MCU
    ----------------------------------
    1  ~RST(TXD)        PD3
    2   GND             GND
    3  ~RDY             PD4
    4   RXD             PD2
    5  ~RTY             PD5
    6   NC                 
    7   NC                 
    8   5V              VCC




Protocol
--------
Signal: Asynchronous, Positive logic, 19200baud, Least bit first
Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit



Build Firmware
--------------
Just use 'make'

    $ cd pc98_usb
    $ make

Then, load the binary to MCU with your favorite programmer.



Other PC98 converter projects and resource
------------------------------------------
PC98 to USB
http://davy.nyacom.net/kbd98usb/

PC98 to PS/2
http://www.tsp.ne.jp/~sawada/mago/c_gka98at.htm
http://www.tsp.ne.jp/~sawada/mago/src/gka98at.asm

PC98 keyboard commands
http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt


Inhibit repeating key:
0x9C, 0x70