Power Computing ATARI PC720 Owner's Manual page 11

Normal Mode.
The drive will operate as a standard Readwrite 880K external
floppy drive.
Anti-Virus Mode
The drive will operate as a standard Readwrite 880K external floppy
drive. but write access to the boot block on ALL drives (including the
internal drive) will be prevented. You will not be able to format disks or
carry out any other action that writes to the bootblock.
Blitz Mode.
This mode should be used with the BLITZ software when you want to
back up floppy disks. It should not be used from the workbench and
may give unpredictable results if this is done.
Installation of the PC880B
1. Switch off your Amiga and all its peripherals.
2. Switch the PC880B's isolating switch (located on the rear of the drive)
to position 1.
3. Switch the Function switch to position 0 (Normal Mode).
4. Connect the disk drive's connector to the drive socket on the back
panel of your Amiga. The plug will only fit one way into the socket.
Tighten the screws on the connector to the computer back panel.
5. Turn on the computer and peripherals. The drive will draw its power
from your Amiga, and there is no need for an external power supply for
the PC880B.
6 . Once the Workbench screen has booted from your internal drive,
place a disk in your PC880, and a drive icon will appear on the
WorkBench. If no icon appears, and the drive LED fails to light,
SWITCH O F F your Amiga and peripherals. check the position of the
PC880B's switches, and repeat steps 3-5.