Singer 40 - Disc Sector Layout Diagram

Timing Considerations
The disc is formatted as shown in Figure 7 -1.
63 73 83 93
61
51
95
90
56
66
98 88 78 68
NOTE: Sector 0-49 are accessed by the upper head on each arm, and sectors
50-99 are accessed by the lower head.
Figure 7-1. Disc Sector Layout
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7 -2 Models 40 to 42 Reference Manual