Digital UNIX
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Overview

The Digital UNIX Version 4.0 I/O subsystem supports a variety of buses and devices depending upon the particular machine and its configuration. Table 6-1 lists the most common configurations.

Table 6-1. Supported Processors and Buses

ProcessorsBuses
AlphaStation 200, 250, and 255 series processorsPCI Bus   ISA Bus   SCSI Bus
AlphaStation/Server 400 series processorsPCI Bus    ISA Bus    SCSI Bus
AlphaStation 600 series processorsPCI Bus    EISA Bus    SCSI Bus
AlphaServer 1000 series processorsPCI Bus    EISA Bus    SCSI Bus
Alpha VME 2100 series processorsVME Bus    EISA Bus
AlphaServer 2000 series processorsPCI Bus    EISA Bus    SCSI Bus
AlphaServer 2100 series processorsPCI Bus    EISA Bus    SCSI Bus
AlphaServer 8000 series processorsPCI Bus    Futurebus+    XMI Bus    EISA Bus    SCSI Bus
DEC 2000 series processorsEISA Bus    SCSI Bus
DEC 2100 series processorsPCI Bus    EISA Bus    SCSI Bus
DEC 3000 series processorsTURBOchannel Bus    SCSI Bus
DEC 4000 series processorsFuturebus+ SCSI Bus
DEC 7000/10000 series processorsFuturebus+ XMI Bus    SCSI Bus    CI to HSC to RA/TA devices    KDM to RA/TA devices
Single Board Computer (SBC) EB66+PCI Bus EISA Bus
Single Board Computer (SBC) EB64+PCI Bus EISA Bus
Single Board Computer (SBC) EB164PCI Bus EISA Bus
Single Board Computer (SBC) AlphaPC64PCI Bus EISA Bus

All of the device driver code is written by Digital and is written to published, industry standards.

In addition, Digital's UNIX Publications Group publishes a device driver tutorial and a series of bus books that are designed to assist third-party vendors in writing device drivers that are compatible with Digital UNIX Version 4.0.

For more information on how to write device drivers for Digital UNIX Version 4.0, see the following books:

Writing Device Drivers: Tutorial Writing Device Drivers: Reference Writing EISA and ISA Bus Device Drivers Writing PCI Bus Device Drivers Writing Device Drivers for the SCSI/CAM Architecture Interfaces Writing TURBOchannel Device Drivers Writing VMEbus Device Drivers

For information on the various peripheral devices that Digital UNIX Version 4.0 supports, refer to the Alpha Systems Handbook, the Software Product Description (SPD), and the Systems and Options Catalog.

The following sections briefly discuss the buses supported in Digital UNIX Version 4.0 as well as I/O enhancements such as RAID and tagged queueing, and the XMI CI and KDM controllers.

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