IBM 5155 Manual To Operations page 311

Diskette Drive Switch Settings
The following figure shows the settings for switches 7
and 8.
Warning:
Before you change any switch settings,
make a note of how the switches are presently set.
1 2 3 4 5 6 7 8
1Drive
~DDDDDD~~
2 3 4 5 6 7 8
2 Drives
~DDDDDD~~
Switch Settings 4-83