3 Jun
2018
3 Jun
'18
10:34 a.m.
The 729 CE manual quotes 555 BPI. I?m not sure when it became 556.
http://bitsavers.trailing-edge.com/pdf/ibm/magtape/729/223-6845_729_CEman_1…
The IBM 728 was 248 BPI. Before that it was the nice round number 200 BPI.
I tried permutations of standard IPS and round number data rates and don?t see anything
that yields exactly 556BPI.
Tim