DECpc AXP 150 and DEC 2000 Model 300 AXP Adaptec AHA-1742A SCSI Adapter

This manual provides instructions for installing, configuring, and troubleshooting the Adaptec AHA-1742A SCSI adapter in DEC 2000 Model 300 AXP and DECpc AXP 150 systems.

The installation section covers preparing the system by potentially disabling the floppy controller and removing onboard SCSI terminators, depending on whether it's the first or second adapter and if external devices are used. It details the steps for physically installing the adapter, connecting external SCSI devices, and verifying the connection using the SHOW DEVICE command to ensure all devices are listed with unique SCSI IDs.

Configuration involves using the EISA Configuration Utility (ECU) to adjust settings such as the Host Adapter Interface, BIOS Base Address, Host Adapter SCSI ID, and SCSI Bus Reset at Power-on, with default settings provided.

The troubleshooting section outlines common issues like the adapter not appearing during self-test or devices not showing up in the SHOW DEVICE display, offering possible causes and recommended solutions such as re-seating the adapter, reconfiguring via ECU, checking SCSI IDs, and ensuring proper SCSI bus termination.

Finally, an appendix lists the adapter's specifications, including power requirements, operating environment conditions, EISA identification, and a detailed pinout for the SCSI port.