qmk-dactyl-manuform-a/converter/pc98_usb/README

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PC98 to USB keyboard protocol converter
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Target MCU is ATMega32u4 but other USB capable AVR will also work.
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Connector
---------
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8Pin mini DIN
___ ___
/ |_| \
/ 8 7 6 \
| 5 4 3 |
\_ 2 1 _/
\_____/
(receptacle)
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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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1 ~RST PD1
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2 GND GND
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3 ~RDY PD4
4 RXD PD2
5 ~RTY PD5
6 NC
7 NC
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8 5V VCC
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Protocol
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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.
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Build Firmware
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Just use 'make'
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$ cd pc98_usb
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$ make
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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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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