IBM Personal Computer XT Manual To Operations page 224

5-1/4 Inch Diskette Drives
The following figures show how switches 7 and 8 must
be set for the number of diskette drives installed.
0 ' 2 3 4 5 6 7 8 \
1 Drive
fDDDDDD~~
'-
\
0 ' 2 3 4
'878\
2 Drives
fDDDDDD~~
"
\
4-10 Switch Settings