Commodore 64 (C64) Preservation ProjectCommodore 64 (C64) Preservation Project
Vorpal - Later
Epyx Vorpal (later versions with sync-less tracks)
Last Updated: 10/12/05

This protection is used to protect later Epyx games such as California Games, Legend of Blacksilver, Championshiop Wrestling, "The Games" Summer and Winter Editions, LA Crackdown, and Street Sports Basketball.

These disks contain several tracks (every other one for at least tracks < 18) that have no sync signal. I have partially disassembled the Maverick copier and it is trying to detect sectors on these syncless tracks by searching for the pattern $55 or $AA. We cannot detect a normal track cycle in these tracks by normal means due to unknown reasons. My educated guess is that either the tracks contain data written at different densities (doubtful, since there isn't any bad GCR) or it has several sectors that are "sliding" (bitshifted from one another) due to lack of framing.

This project is all done in my own spare time with my own money. If you appreciate the amount of work that went into it, please donate whatever you see fit.
C64 Registry Stats
Total Registered: 3419

Top 5 Earliest Serials
Unknown: 0019
Charles Lynch: 0021
David Bradley: s00001044
Jeremy DuBois: S00001185
John Justice: s00001281

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