opcode website 1996: http://web.archive.org/web/19961113025503/http://www.opcode.com/
opcode website 1997: http://web.archive.org/web/19971211034443/http://www.opcode.com/
opcode website 1999: http://web.archive.org/web/19990427044321/http://www.opcode.com/
opcode website 2000: http://web.archive.org/web/20000229140320/http://www.opcode.com/