Bob, I saw a thread in classiccmp.org where you said "Its quite easy to 'unmodify' the customized 21MX and turn it back into a normal E-series. I've done this modification several times, contact me off-list if you want the details." I've got a HP 5423A and I'd sure like the details!!!! Cheers, Lyle -- Lyle Bickley Bickley Consulting West Inc. Mountain View, CA 94040 "Black holes are where God is dividing by zero"