How many track is this tape? seems like most solutions suggested so far are for 8-track and I ISTR that Atlas normally used 7-track but I thought only 5-t used shifts. Internally Atlas probably used a 3-shift code (as later used by the 1900 for paper-tape) with 6-bit characters as was common for computers in those pre-ascii days. If it is 5-track a greater degree of care will be required with the use of a winder as that narrow tape twisted and snarled-up so much more easily than the wider forms. Andy