BOCA Systems formula for black mark location:
x = 6.688" - (ticket length * n), where

n = 0 for 6.688" (169.88mm) <= ticket length
n = 1 for 3.344" (85.600mm) <= ticket length < 6.688" (169.88mm)
n = 2 for 2.230" (56.642mm) <= ticket length < 3.344" (85.600mm)
n = 3 for 1.900" (48.260mm) < ticket length < 2.230" (56.642mm)

Note : Ticket Width = 2", 2.125", 2.5", 3", 3.25", 4" or 8"
Note 2: Ticket's minimal length: 1.9" (48.26mm); max length: 13" (330.2mm)

Original formula by Boca Systems [www.bocasystems.com/tickets_specs.html]
BATman 2.0 (Roxie edition) is released under GPL v2[www.gnu.org/licenses/gpl-2.0.html]
Icon by Sedgemonkey [www.sedgeman.com]
Jonas & Julien - July 2012