Edit README of PC98
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Sun to USB keyboard protocol converter
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PC98 to USB keyboard protocol converter
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======================================
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=======================================
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Target MCU is ATMega32u4 but other USB capable AVR will also work.
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Target MCU is ATMega32u4 but other USB capable AVR will also work.
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Supported keyboards: Sun Type 5 Keyboard, CTCSP SHORT TYPE KEYBOARD(CKUB)
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CTCSP SHORT TYPE KEYBOARD: http://imgur.com/a/QIv6p
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Connector
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Connector
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---------
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8Pin mini DIN
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8Pin mini DIN
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___ ___
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___ ___
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/ |_| \
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/ |_| \
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@ -19,61 +15,51 @@ Connector
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\_____/
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\_____/
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(receptacle)
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(receptacle)
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Wiring:
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Wiring: You can change this with ediging config.h.
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Pin mini DIN MCU
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Pin mini DIN MCU
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----------------------------------
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1 GND GND
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1 ~RST PD1
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2 GND GND
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2 GND GND
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3 5V
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3 ~RDY PD4
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4 RX/TX(Mouse)
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4 RXD PD2
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5 RX PD3
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5 ~RTY PD5
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6 TX PD2
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6 NC
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7 GND GND
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7 NC
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8 5V VCC
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8 5V VCC
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Protocol
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Protocol
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--------
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--------
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Singnal: Asynchronous, Negative logic, 1200baud, No Flow control
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Singnal: Asynchronous, Positive logic, 19200baud, Least bit first
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Frame format: 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit
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Frame format: 1-Start bit(Lo), 8-Data bits, Odd-Parity, 1-Stop bit
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AVR USART engine expects positive logic while Sun keyboard signal is negative.
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This converter uses software method for testing purpose. AVR UART engine will work better.
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To use AVR UART engine you need exteral inverter in front of RX and TX pin.
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Otherwise you can software serial routine to communicate the keyboard.
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This converter uses software method, you doesn't need any inverter part.
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Commands From System To Keyboard
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0x01 Reset
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Keyboard responds with following byte sequence:
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Success: 0xFF 0x04 0x7F
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Fail: 0x7E 0x01 0x7F
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0x02 Bell On
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0x03 Bell Off
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0x0A Click On
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0x0B Click Off
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0x0E LED
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followed by LED status byte:
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bit: 3 2 1 0
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LED: CapsLk ScrLk Compose NumLk
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0x0F Layout
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Keyboard responds with 'Layout Response' 0xFE 0xXX
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Commands From Keyboard To System
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0x7F Idle
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means no keys pressed.
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0xFE Layout Response
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0xFF Reset Response(followed by 0x04)
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Reference
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http://kentie.net/article/sunkbd/page2.htm
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http://kentie.net/article/sunkbd/KBD.pdf
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Build Firmware
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Build Firmware
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--------------
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--------------
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Just use 'make'
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Just use 'make'
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$ cd sun_usb
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$ cd pc98_usb
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$ make
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$ make
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Then, load the binary to MCU with your favorite programmer.
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Then, load the binary to MCU with your favorite programmer.
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Other PC98 converter projects and resource
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------------------------------------------
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PC98 to USB
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http://davy.nyacom.net/kbd98usb/
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PC98 to PS/2
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http://www.tsp.ne.jp/~sawada/mago/c_gka98at.htm
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PC98 keyboard commands
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http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt
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