Instruction manual

Chapter 2 Installation 21
35 A0 36 A2
37 CS0 38 CS1
39 -ACT 40 GND
Floppy drive connections (CN2)
You can attach up to two floppy disks to the SBC-400's on-board
controller. You can use any combination of 5.25" (360 KB and
1.2 MB) and/or 3.5" (720 KB, 1.44 MB, and 2.88 MB) drives.
The SBC-400 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).
Connecting the floppy drive
1. Plug the 34-pin flat-cable connector into CN2 on the CPU
card.
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 CN2:
Floppy disk connector (CN2)
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