The ISA Sync Upgrade Owner's Guide provides instructions for installing the ISA Sync board and ISA software into your CHALLENGE M system. This manual also describes how to configure the ISA upgrade for your system.

Caution: This upgrade version requires version 5.3 of the IRIX™ operating system for proper operation.

The ISA Sync board provides serial data communications front-end processing that supports both the X.25 and SNA (system network architecture) communications protocols.

The ISA Sync board provides one of three interfaces:

The ISA Sync board also uses one ISA slot. Up to four boards can be installed in each system.

Note: This version of the upgrade provides two additional interface options (X.21 and V.35). An earlier version of the upgrade provided only EIA-232-C and used IRIX version 5.2.

Manual Organization

This manual includes the following chapters:

“Introduction” provides an overview of the board, describes typographical conventions that are used in text, and points to manuals that are related to the ISA Sync board.

Chapter 1, “ISA Sync Board Controls and Indicators,” describes the controls and indicators on the ISA Sync board.

Chapter 2, “Installing the ISA Sync Upgrade,” describes the installation of the ISA Sync board and its associated software into the CHALLENGE M system.

Chapter 3, “Configuring Software for the ISA Sync Board,” describes how to configure the board software.

Appendix A, “Software Messages and Error Recovery,” describes the informational and error messages that may be displayed by the software and suggests actions to take to resolve them, if necessary.

Appendix B, “ISA Sync Board Specifications,” provides the hardware specifications for the ISA Sync board.

Related Documentation

The manuals in this section may help you obtain additional information.

  • The owner's guide you received with your computer system.

  • The VME/ISA Synchronous Communications Administrator's Guide describes the administration procedures for the ISA and VME Sync boards.


The ISA Sync board is designed for customer installation and configuration. No special training or experience is necessary.

Typographical Conventions

These type conventions and symbols are used throughout this guide:


Filenames, variables, IRIX command arguments, command flags, titles of publications, icon names.

Screen type 

Code examples, file excerpts, and screen displays (including error messages).

Bold Screen type 

User input


(Parentheses) Following IRIX commands, they surround the reference page (man page) section where the command is described.


(Brackets) Surrounding optional syntax statement arguments.


IRIX shell prompt for the superuser (root).

Product Support

Silicon Graphics offers a comprehensive product support and maintenance program for their products. For information about using support services for this product, refer to the release notes that accompany it.