#!/usr/bin/env python2

"""
GCR-1541
G64 version
track count in image (usually 84)
track size lo/HI in bytes, usually 7928
offset to stored track 1.0 (count: 4)
offset to stored track 1.5 (count: 4)
offset to stored track 2.0 (count: 4)
...
offset to stored track 42.5 (count: 4)
speed zone entry for track 1 (count: 4)
...
speed zone entry for track 42.5 (count: 4).
speed zone 3 is slowest, speed zone 0 is fastest.
tracks 1..17 usually have speed zone 3.
tracks 18..24 usually have speed zone 2.
tracks 25..30 usually have speed zone 1.
tracks 31.. usually have speed zone 0.
"""

""" track:
actual size (count: 2)
track data
filler bytes.
"""