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This book contains the following chapters: Chapter 1. Introduction: gives board specifications, and describes µGENI’s capabilities. Chapter 2. Hardware Interface: contains information about µGENI board hardware, motherboard requirements, signals, and timing. Chapter 3. Software Interface: describes the µGENI’s Shared RAM memory, which handles all data transfer between µGENI and the host. Chapter 3 also summarizes µGENI’s activities during startup, steady state operation, and device login. Chapter 4. Setup: describes the area of Shared RAM where µGENI stores its Genius bus setting and other setup data. Chapter 5. Status: describes the portion of Shared RAM where µGENI stores its status data. Chapter 6. Interrupts: describes Interrupt conditions. Chapter 6 also explains how to monitor Interrupt status, and how to enable or disable Interrupts from µGENI to the host. Chapter 7. Device Configuration: describes the table in Shared RAM where µGENI stores information about devices on the bus. It also explains how µGENI obtains this data. Chapter 8. Device Inputs and Outputs: describes the area of Shared RAM which is used for input and output data. Chapter 9. I/O Table Lockout: explains how the host can request or relinquish lockout of the I/O Tables in Shared RAM. Chapter 10. Commands: explains how the host can send and receive datagrams, and change µGENI configuration. Chapter 11. Global Data: describes how µGENI can automatically exchange up to 128 bytes of Global Data with all other devices on the bus. Chapter 12. Directed Control Data: explains how µGENI can direct or receive up to 128 bytes of data to/from any other bus controller. Chapter 13. Memory Access Datagrams: explains how µGENI handles requests by other devices to read or write host memory. Preface iv Genius I/O mGENI Board User’s Manual – October 1995 GFK-0845A Chapter 14. Troubleshooting: suggests troubleshooting steps based on observation of LEDS and the occurrence of bus errors. Appendix A. General Macro Definitions: suggests simple macro definitions that might be used for a C language interface to µGENI.