@@ 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