I've heared that original Diamond download for that XOC bios is gone so here is reupload on rapidshare.
If it gets deleted, just PM me and I'll upload again..

http://rapidshare.com/files/14071884...00MHz.zip.html

ZIP contains untouched exe from their servers, and I've just added txt file in ZIP, which contains this thread URL, and copies of original post, my post asking if it was ATI or Diamond source, and IRONBMAN's reply confirming it's from Diamond Multimedia..