John Van Gardner sent the following - March 15, 2006
" I was looking through some manuals today and saw the attached note at the beginning of the 1401 Maintenance Manual 225-6487-3. It tells of the repackaging that was done at the 20000 serial number level. I believe this was when they went to the NAND TAU-9 but that is only a guess. "
1401 Maint Manua l225-6487-3 page 2
1401 Backpanel Wiring Rules