I'm not sure if anybody on the list has seen this web page (I'm sure some of you have) but anyways, it is quite informative... http://www.isthq.com/~dan/aldl.htm -- Christopher Bruno Teradyne 321 Harrison Ave. MS/H53 Boston, MA 02118 617.422.2040 Office 617.368.7062 Fax bruno at icd.teradyne.com