PS1XR-xx Storage Expansion Box

This document, published in February 1991, describes the PS1XR-xx Storage Expansion Box (Order Number EK-PSSEB-IN-001). It is designed to provide external storage for Digital's applicationDEC systems running SCO UNIX and SCO Open Desktop operating systems.

Key points include:

• Relationship to BA42 Box: The PS1XR-xx box is largely similar to the BA42 Storage Expansion Box. Its primary differences are that its disks are configured to spin-up at power-on (for SCO UNIX and MS-DOS compatibility) and it ships with straight SCSI connectors instead of angled ones. Users are directed to the BA42 Storage Expansion Box Installation Guide for full installation details.
• Software Compatibility: It emphasizes using Digital-supplied versions of SCO UNIX and Open Desktop for reliable operation, as these include necessary patches and enhancements. Software configuration after installation is required, with specific instructions found in SCO MPX or SCO UNIX/Open Desktop administration guides depending on the system type (multiprocessor or single-processor).
• Kit Contents: Each box includes a power cord, a 50-pin SCSI terminator, an 18-inch 50-pin SCSI cable, a 6-foot 50-pin SCSI cable, and documentation.
• Configurations: Various models offer storage capacities from 665 MB to 2.4 GB, with expansion kits available. Up to two PS1XR-xx boxes can be connected together, providing a maximum external storage capacity of 4.8 GB.
• Installation: Provides a summary of connection steps, including checking SCSI ID, connecting SCSI cables, installing a terminator on the unused SCSI port, and connecting power. It crucially notes that both ends of the SCSI bus must be terminated.