Specifications

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TABLE OF CONTENTS
CHAPTER 1—INTRODUCTION
1.1 General Description ............................................................................................................... 1–1
1.2 Features ................................................................................................................................. 1–1
1.2.1 Enhanced Reliability.............................................................................................. 1–3
1.3 Little Board/486i Specifications............................................................................................. 1–4
1.3.1 CPU/Motherboard.................................................................................................. 1–4
1.3.2 Embedded-PC System Enhancements ..................................................................... 1–4
1.3.3 Onboard Peripherals............................................................................................... 1–5
1.3.4 Support Software ................................................................................................... 1–7
1.3.5 Mechanical and Environmental Specifications........................................................ 1–7
CHAPTER 2—HARDWARE CONFIGURATION
2.1 Introduction ........................................................................................................................... 2–1
2.1.1 Interface Connector Summary ................................................................................ 2–1
2.1.2 Jumper Configuration Options................................................................................ 2–4
2.2 DC Power ............................................................................................................................... 2–6
2.2.1 Power Requirements .............................................................................................. 2–6
2.2.2 Powerfail Options .................................................................................................. 2–7
2.2.3 Backup Battery ...................................................................................................... 2–7
2.2.4 Cooling Requirements............................................................................................ 2–8
2.3 CPU CLOCK AND CACHE CONFIGURATION.................................................................... 2–8
2.4 DRAM................................................................................................................................... 2–9
2.4.1 Shadowing ............................................................................................................. 2–10
2.4.2 Expanded Memory and Extended Memory ............................................................. 2–10
2.5 Math Coprocessor .................................................................................................................. 2–10
2.6 Serial Ports (J11, J13)............................................................................................................2–10
2.6.1 I/O Addresses ........................................................................................................ 2–10
2.6.2 Interrupt Assignments ............................................................................................ 2–11
2.6.3 ROM-BIOS Installation of the Serial Ports............................................................. 2–11
2.6.4 Serial Port Connectors (J11, J13) ........................................................................... 2–12
2.6.5 Serial Console........................................................................................................ 2–13
2.6.6 Serial Downloader ................................................................................................. 2–13
2.7 Multimode Parallel Port (J15) ................................................................................................ 2–13
2.7.1 I/O Addresses ........................................................................................................ 2–13
2.7.2 ROM-BIOS Installation of Parallel Ports................................................................ 2–14
2.7.3 Interrupts ............................................................................................................... 2–14
2.7.4 DMA Channels ......................................................................................................2–14
2.7.5 Parallel Port Connector (J15) ................................................................................. 2–15
2.8 Floppy Disk Interface............................................................................................................. 2–17
2.8.1 Floppy Drive Considerations.................................................................................. 2–17
2.8.2 Floppy Interface Configuration .............................................................................. 2–18
2.8.3 Floppy Interface Connector (J14)........................................................................... 2–18
2.9 IDE Hard Disk Interface (J12) ............................................................................................... 2–19
2.9.1 IDE Interface Configuration................................................................................... 2–21
2.10 SCSI Interface...................................................................................................................... 2–21
2.10.1 SCSI Interface Configuration ............................................................................... 2–22