Specifications

Hardware Configuration
2–21
Pin Signal Name Function In/Out
32 RSVD Reserved N/C
33 HOST A1 Drive address 1 OUT
34 RSVD Reserved N/C
35 HOST AD0 Drive address 0 OUT
36 HOST AD2 Drive address 2 OUT
37 -HOST CS0 Chip select OUT
38 -HOST CS1 Chip select OUT
39 -HOST SLV/ACT Drive active/drive slave 10K Pull-up
40 GND Ground OUT
Table 2-15 IDE Drive Interface Connector (J12) (cont.)
Connector Type Mating Connector
RIBBON 3M 3417-7600
DISCRETE WIRE MOLEX HOUSING 22-55-2402
PIN 16-02-0103
Table 2-16 J12 Mating Connector
2.9.1 IDE Interface Configuration
Use SETUP to specify your IDE hard disk drive type. If you do not find a drive type whose
displayed parameters match the drive you are using, use drive type 48 or 49. These two “pseudo-
types” allow you to manually enter the drive’s parameters. The drive manufacturer provides the drive
parameters—check the drive’s documentation for the proper values to enter. See the section on
SETUP in Chapter 3 for additional information.
If you use an IDE drive in your system, you can still add SCSI drives or other SCSI peripherals. The
Ampro ROM BIOS provides a means for allowing both IDE and SCSI drives on the same system.
See the SETUP description in Chapter 3 for details.
2.10 SCSI INTERFACE
The Little Board/486i features a 16-bit Small Computer System Interface (SCSI) controller
compatible with SCSI-II software and peripherals. The SCSI port uses a 50-pin male header
connector (J9) to interface with peripherals. This connector provides an 8-bit path to the peripheral
device, standard for most peripherals. The controller subsystem has a 16-bit path to the CPU.
Table 2-17 shows the pinout and signal definitions of this interface. Refer to your SCSI device
documentation, or the ANSI X3.131 SCSI specification for detailed information on the signal
functions.
The recommended maximum SCSI bus cable length, from the board to the most distant SCSI
peripheral, is 18 feet.
Table 2-18 shows manufacturer’s part numbers for mating connectors.