This is an OS/9 X68000 40MB SASI hard disk image configured for a text console.
AV-RIDER is installed. It is known to run under XM6 
(http://www.jcec.co.uk/X68emu.htm or http://yohkai.no-ip.info/x680x0/XM6.htm) as
well as WinX68KHighSpeed (however, the floppy does not work under WinX68K). Most
of the system messages are in Japanese by default (the Japanese prompt displayed
at startup is a login prompt; to log in as the super-user, press enter). The
shell command "unsetenv COUNTRY" switches most of the system messages to
English.