Aaeon SBC-456 User Manual page 27

You can attach up to two floppy disks to the SBC-456/456E's on-
board controller. You can use any combination of 5 1/4" (360 KB
and 1.2 MB) and/or 3 1/2" (720 KB, 1.44 MB, and 2.88 MB) drives.
The SBC-456/456E CPU card comes with a 34-pin daisy-chain drive
connector cable. On one end of the cable is a 34-pin flat-cable
connector. There are two sets of floppy disk drive connectors, one
in the middle, and one on the other end. Each set consists of a 34-
pin flat-cable connector (usually used for 3.5" drives) and a
printed-circuit board connector (usually used for 5.25" drives).
1. Plug the 34-pin flat-cable connector into the CN3 connector.
2. Attach the appropriate connector on the other end of the cable
to the floppy drive(s). You can use only one connector in the
set. The set on the end (after the twist in the cable) connects to
the A: floppy. The set in the middle connects to the B: floppy.
Pin assignments
The following table lists the pin assignments for the CN3 connec-
tor:
Pin Signal
GND
1~33 (odd)
4, 6 Unused
10 Motor enable A 12
14 Driver select A
18 Direction
22 Write data
26 Track 0
30 Read data
34 Disk change
Pin Signal
2 High density
8 Index
Driver select B
16 Motor enable B
20 Step pulse
24 Write enable
28 Write protect
32 Select head
Chapter 2 Installation 19