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Pournelle disliked copy protection and, except for games, refused to review software that used it. Apple and Commodore 64 copy protection schemes were extremely varied and creative because most of the floppy disk reading and writing was controlled by software (or firmware), not by hardware. So have those who used TRS-DOS, and I understand that MS-DOS has copy protection features". The ease of copying depended on the system Jerry Pournelle wrote in BYTE in 1983 that " CP/M doesn't lend itself to copy protection" so its users "haven't been too worried" about it, while "Apple users, though, have always had the problem. Software piracy began to be a concern when floppy disks became the common storage media. When possible, nibblers will work with the low-level data encoding format used by the disk system, being Group Coded Recording (GCR - Apple, Commodore), Frequency Modulation (FM - Atari), or Modified Frequency Modulation (MFM - Amiga, Atari, IBM PC). In most cases the nibbler software still analyses the data on a byte level, only looking to the bit level when dealing with synchronization marks (syncs), zero-gaps and other sector & track headers. It functions at a very low level directly interacting with the disk drive hardware to override a copy protection scheme that the floppy disk's data may be stored in. JSTOR ( September 2017) ( Learn how and when to remove this template message)Ī bit nibbler, or nibbler, is a computer software program designed to copy data from a floppy disk one bit at a time.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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