As promised in an earlier post (or as threatened, depending on your point of view :-) ), I have completed my "How To" document for using the DASD DIAG driver with Debian for S390. Here is a link to the web page for it: http://www.wowway.com/~zlinuxman/diag250.htm. I hope it proves useful to someone. I welcome all comments, suggestions, complaints, etc.