Apollo 150, 120 user manual External FDD DB-15, Trko

User Manual version 2207

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

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.

1 6 11

2	7	12
3	8	13
4	9	14
5	1	15
	0

4-46 APOLLO 120/150 III