Aaeon SBC-551 Manual - page 38
30 SBC-551/552 User Manual
Floppy drive connector (CN3)
You can attach up to two floppy disks to the SBC-551/552 onboard
controller. You can use any combination of 5¼" (360 KB and 1.2
MB) and/or 3½" (720 KB, 1.44 MB, and 2.88 MB) drives.
A 34-pin daisy-chain drive connector cable is required for a dual-
drive system. On one end of the cable is a 34-pin flat-cable
connector. On the other end are two sets of floppy disk drive
connectors. Each set consists of a 34-pin flat-cable connector
(usually used for 3½" drives) and a printed-circuit board connector
(usually used for 5¼" drives).
Connecting the floppy drive
1. Plug the 34-pin flat-cable connector into CN3. Make sure that
the red wire corresponds to pin one on the 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: drive. The set in the middle connects to the B: drive.
Pin assignments
The following table lists the pin assignments for the CN3 connec-
tor:
FLOPPY drive connector (CN3)
Pin
Signal
Pin
Signal
1~33 (odd)
GND
2
High density
4, 6
Unused
8
Index
10
Motor enable A 12
Driver select B
14
Driver select A
16
Motor enable B
18
Direction
20
Step pulse
22
Write data
24
Write enable
26
Track 0
28
Write protect
30
Read data
32
Select head
34
Disk change