Floppy Drive Interface (J17); Table 3-12. Floppy Drive Interface Pin/Signal Descriptions (J17) - Ampro LittleBoard800 Reference Manual

Chapter 3
Pin # Signal
47 SD8
48 SD9
49 SD10
50 GND
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

Floppy Drive Interface (J17)

The LPC47B272 chip provides the floppy controller and supports one floppy drive as configured. The
floppy signals are provided through the standard 34-pin connector (J17). This connector is separate (not
shared with) from the parallel port connector (J16). The floppy controller will support a 360k, 720k,
1.2M, 1.44M, or 2.88M drive.
The floppy drive connector has 34 pins, 2 rows, odd/even, (1, 2) with 0.100" pin spacing.

Table 3-12. Floppy Drive Interface Pin/Signal Descriptions (J17)

Pin # Signal
2 DRVEN0
4 NC
6 DRVEN0
8 INDEX
10 MTR0
12 NC
14 DS0
16 NC
18 DIR
20 STEP
22 WDATA
24 WGATE
26 TRK0
28 WRTPRT
29 NC
30 RDATA
32 HDSEL
33 NC
34 DSKCHG
1, 3, 5, 7, GND
9, 11, 13,
15, 17,
19, 21,
23, 25,
27, 31
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
LittleBoard 800
Description
Secondary Disk Data 8 – Refer to SD3 on pin-2 for more information.
Secondary Disk Data 9 – Refer to SD3 on pin-2 for more information.
Secondary Disk Data 10 – Refer to SD3 on pin-2 for more information.
Ground
Description
Drive (Floppy) Density Select 0
Not connected
Drive (Floppy) Density Select 0
Index – Sense to detect that the head is positioned over the beginning of a track
Motor Control 0 – Select motor on drive 0.
Not Connected (DS1)
Drive Select 0 – Select drive 0.
Not Connected (MTR1)
Direction – Direction of head movement (0 = inward motion, 1 = outward
motion).
Step – Low pulse for each track-to-track movement of the head.
Write Data – Encoded data to the drive for write operations.
Write Gate – Signal to the drive to enable current flow in the write head.
Track 0 – Sense detects the head is positioned over track 0.
Write Protect – Senses the diskette is write protected.
Not Connected (NC1)
Read Data – Raw serial bit stream from the drive for read operations.
Head Select – Selects the side for Read/Write operations (0 = side 1, 1 = side 0)
Not Connected (NC2)
Disk Change – Senses the drive door is open or the diskette has been changed
since the last drive selection.
Ground
Reference Manual
Hardware
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