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"In C64 mode, or on a regular C64, the 1571 defaults to single side mode. You can switch to double sided mode by issuing the following command:
OPEN 15,8,15,"U0>M1":CLOSE 15
To switch back to single sided mode:
OPEN 15,8,15,"U0>M0":CLOSE 15
While in single sided mode, you can switch to the other side of the disk, without turning it over, by switching to the other side's read/write head:
OPEN15,8,15,"U0>H1":CLOSE 15
"