Specifications

2–1

CHAPTER 2

HARDWARE CONFIGURATION

2.1 INTRODUCTION

This chapter covers configuring the Little Board/486i and using on-board and peripheral devices. The

topics covered in this chapter are:

! Power and the power fail monitor

! DRAM memory

! Four RS232C serial ports

! Enhanced parallel port

! Floppy disk interface

! IDE hard disk interface

! Two 32-pin byte-wide sockets

! SCSI-II hard disk interface

! Flat-panel/CRT video interface

! Ethernet local area network interface

! Utility connector (Keyboard, PC speaker, reset button, external battery)

! Watchdog timer

! Battery-backed clock

! PC/104-compatible expansion bus

This chapter includes data on the board’s connector signals and pinouts, external device requirements,

interconnection cable wiring, and board configuration.

2.1.1 Interface Connector Summary

Refer to Figure 2-1 for the locations of the connectors (J1-J16) and configuration jumpers (W1–

W24). Table 2-1 summarizes the use of the I/O connectors and Table 2-2 summarizes use of the

configuration jumpers. Each interface is described in its own section, showing connector pinouts,

signal definitions, required mating connectors, and configuration jumper options.

Many of the connectors have a key pin removed. This allows you to block the corresponding cable

connector socket to help prevent improper assembly. Table 2-1 indicates which pins are key pins, and

Figure 2-1 shows their locations.