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User Manual version 2305
APOLLO 120/150 III
4-
46
4.8. External FDD (DB-15)
The APOLLO 120/150 provides two ways to connect to a
floppy disk drive to fit into specific environmental
applications:
1. Internal FDD
2. External FDD
If the FDD is frequently used, it is suggested to use an
internal floppy disk drive. If the drive is used only for system
installation or maintenance, then, an external device can
fulfill this need and is more economical. Please note that if an
internal floppy disk drive already exists, no external floppy
drive can be used.
The APOLLO external FDD interface is a 15-pin D-sub
connector located at the rear side of the chassis. An external
FDD cable is provided to connect a standard 3.5” FDD to the
system. Its pin position and pin assignment are listed as
follows.
Pin # Signal Pin #
Signal
1 DELSEL
9 -WD
2 -INDEX
10 -STEP
3 -MTR1
11 -RD
4 -DVR1
12 -HDSEL
5 -DIR 13 -DSKCHG
6 -WP 14 +5V
7 -TRKO
15 +12V
8 -WG
11
12
13
14
15
1
2
3
4
5
6
7
8
9
1
0
The APOLLO system is equipped with a
+5V/12V DC-out connector to provide 5V
power to drive the external floppy disk
drive. Use the provided FDD power cable
to connect the floppy drive to the 5V
DC-
out connector when an external floppy
drive is attached to the system.