During duplication, the software performs a logical XOR operation on all the recovered bytes in a block. It then compares its calculated result with the checksum byte written on the tape.

What are you working with (Tape, Microdrive, or +3 Floppy Disk)?

The ultimate form of "copying" bypassed tape-to-tape reading altogether by capturing the state of the computer's memory while a game was running. This required a mix of software and hardware, popularized by peripherals like the Multiface 1 or Romantic Robot's Multiprint .

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Removing the 17-byte header meant standard copiers did not know a block was starting, causing them to ignore the data entirely.

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