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35
A0
37
CS0
39
-ACT
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).
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.
The following table lists the pin assignments for CN2:
Pin
Signal
1~33 (odd)
4, 6
Unused
10
Motor enable A 12
14
Driver select A
18
Direction
22
Write data
36
38
40
Pin
GND
8
16
24
A2
CS1
GND
Signal
2
High density
Index
Driver select B
Motor enable B
20
Step pulse
Write enable
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