Ampro Corporation 486E manual Floppy Interface Configuration, Floppy Interface Connector J14

Little Board™/486e Technical Manual

Floppy Interface Configuration

The floppy interface is configured using SETUP to set the number and type of floppy drives connected to the system. Refer to the SETUP section later in this chapter for details.

If the floppy interface is not used, disable it in SETUP. This frees its I/O addresses (3F0h - 3F7h), DMA2, and IRQ6 for use by other peripherals installed on the PC/104 bus.

Floppy Interface Connector (J14)

Table 2–23 shows the pinout and signal definitions of the floppy disk interface connector, J14. The pinout of J14 meets the AT standard for floppy drive cables. Table 2–24 shows the manufacturer’s part numbers for mating connectors.

Table 2–23. Floppy Disk Interface Connector (J14)

Pin	Signal Name	Function	In/Out
2	RPM/-RWC	Speed/Precomp	OUT
4	N/A	(Not used)	N/A
6	N/A	Key pin	N/A
8	-IDX	Index Pulse	IN
10	-MO1	Motor On 1	OUT
12	-DS2	Drive Select 2	OUT
14	-DS1	Drive Select 1	OUT
16	-MO2	Motor On 2	OUT
18	-DIRC	Direction Select	OUT
20	-STEP	Step	OUT
22	-WD	Write Data	OUT
24	-WE	Write Enable	OUT
26	-TRKO	Track 0	IN
28	-WP	Write Protect	IN
30	-RDD	Read Data	IN
32	-HS	Head Select	OUT
34	-DCHG	Disk Change	IN
1-33	(all odd)	Signal grounds	N/A

Table 2–24. J14 Mating Connector

Connector Type

Mating Connector

Ribbon	3M 3414-7600
Discrete Wire	MOLEX Housing 22-55-2342
	PIN 16-02-0103

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