Card designed for remote access to a PC, including the Bios.
Recognized as a MDA display adapter and use a serial terminal for input/output.
Price: 175€ plus shipping.
It's also on ebay.
Model RW-XT-001, boots Windows NT4.0 in japanese.
More infos on the official website:
https://web.archive.org/web/20010220123522/http://www.rom-win.co.jp/english/e_top.htm
https://web.archive.org/web/20091130032053/http://www.rom-win.co.jp:80/RWHP/support/RWsup/Support.htm
Asking 30€ plus...