Edit README of PC98

converter/pc98_usb/README

@@ -1,79 +1,65 @@
-Sun to USB keyboard protocol converter
-======================================
+PC98 to USB keyboard protocol converter
+=======================================
 Target MCU is ATMega32u4 but other USB capable AVR will also work.
-Supported keyboards: Sun Type 5 Keyboard, CTCSP SHORT TYPE KEYBOARD(CKUB)
 
-CTCSP SHORT TYPE KEYBOARD: http://imgur.com/a/QIv6p
 
+Connector
+---------
 
+    8Pin mini DIN
+       ___ ___
+      /  |_|  \
+     / 8  7  6 \
+    | 5    4  3 |
+     \_ 2   1 _/
+       \_____/  
+     (receptacle)
 
 
-Connector
----------
-  8Pin mini DIN
-     ___ ___
-    /  |_|  \
-   / 8  7  6 \
-  | 5    4  3 |
-   \_ 2   1 _/
-     \_____/  
-   (receptacle)
-
-    Wiring:
+Wiring: You can change this with ediging config.h.
+
     Pin mini DIN        MCU
     ----------------------------------
-    1   GND             GND
+    1  ~RST             PD1
     2   GND             GND
-    3   5V
-    4   RX/TX(Mouse)
-    5   RX              PD3
-    6   TX              PD2
-    7   GND             GND
+    3  ~RDY             PD4
+    4   RXD             PD2
+    5  ~RTY             PD5
+    6   NC                 
+    7   NC                 
     8   5V              VCC
 
 
+
+
 Protocol
 --------
-Singnal: Asynchronous, Negative logic, 1200baud, No Flow control
-Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
-
-    AVR USART engine expects positive logic while Sun keyboard signal is negative.
-    To use AVR UART engine you need exteral inverter in front of RX and TX pin.
-    Otherwise you can software serial routine to communicate the keyboard.
-
-This converter uses software method, you doesn't need any inverter part.
-
-
-Commands From System To Keyboard
-    0x01 Reset
-            Keyboard responds with following byte sequence:
-            Success: 0xFF 0x04 0x7F
-            Fail:    0x7E 0x01 0x7F
-    0x02 Bell On
-    0x03 Bell Off
-    0x0A Click On
-    0x0B Click Off
-    0x0E LED
-            followed by LED status byte:
-            bit: 3       2       1       0
-            LED: CapsLk  ScrLk   Compose NumLk
-    0x0F Layout
-            Keyboard responds with 'Layout Response' 0xFE 0xXX
-
-Commands From Keyboard To System
-    0x7F Idle
-            means no keys pressed.
-    0xFE Layout Response
-    0xFF Reset Response(followed by 0x04)
-     
-Reference
-    http://kentie.net/article/sunkbd/page2.htm
-    http://kentie.net/article/sunkbd/KBD.pdf
+Singnal: Asynchronous, Positive logic, 19200baud, Least bit first
+Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit
+
+This converter uses software method for testing purpose. AVR UART engine will work better.
+
+
 
 
 Build Firmware
 --------------
 Just use 'make'
-    $ cd sun_usb
+
+    $ 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
+
+PC98 keyboard commands
+http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt