Please look to the ubb5.47c on the same server http://64.177.11.178/cgi-bin/ulver5/Ultimate.cgi?action=intro, which in Cirillic (Windows) from <meta http-equiv="content-type" content="text/html; charset=windows-1251">!

...but UBB6 always in ISO charset <img src="https://www.ubbcentral.com/boards/images/graemlins/frown.gif" alt="" />