Floppy Disk Preservation Project
Fat Tracks - Early EA
This protection contains a "fat" track on tracks 34 and 35, meaning it is one track that is twice as wide, or to explain another way-- the exact same data on two tracks lined up perfectly.

This protection will work in VICE since it aligns all tracks, but on a real 1541 it is difficult to remaster due to the lack of hardware assistance in laying down tracks exactly aligned. It can be done with the proper drive speed and timings.

Here is an article with full disassembly from Keith Henrikson

Apple ][ Registry Stats
Total Registered: 100

Top 5 Earliest Serials
Douglas Ward: A2s1-A2S1-4714
Unknown: A2S1-0001
Jef Raskin: A2S1-0002
Bob Bishop: A2S1-0013
Achim BaquƩ: A2S1-0025

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Paul Hagstrom:
A2S2-1497165

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C64 Registry Stats
Total Registered: 2556

Top 5 Earliest Serials
Unknown: 0019
Charles Lynch: 0021
John Justice: s00001281
c64web.com: S00001390
Matteo Caccia: S00001576

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Sos:
HB41651823E

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Titles archived: 3532
Titles verified: 1348

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All content copyright (c) 1971- by Peter Rittwage. All programs mentioned are copyrighted by their respective owners.