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In page Commodore 128:

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All 1571 drives will normally start up in native mode on the C128. If the user switches to C64 mode by typing GO 64, the drive remains in native mode. But if C64 mode is activated by holding the Commodore key down when powering up, the 1571 then goes into 1541 mode. This routine is necessary for software that performs low-level drive access.[citation needed]