Technical Reference Guide
Compaq Personal Computers
Original - December 2000
G-3
G.3 SCSI ADAPTER PROGRAMMING
G.3.1 SCSI ADAPTER CONFIGURATION
The Adaptec SCSI Host Adapter Card is a PCI device and configured using PCI protocol and PCI
Configuration Space registers (PCI addresses 00h-FFh) as discussed in Chapter 4 of this guide.
Configuration is accomplished by BIOS during POST and re-configurable with software. The
vender ID and device ID for the adapter are as follows:
Vender ID (PCI config. addr. 00h): 9005h
Device ID (PCI config, addr. 02h): 0080h
G.3.2 SCSI ADAPTER CONTROL
Control of the SCSI host adapter is affected through I/O mapped registers mapped as listed in
Table G-1.
Table G–1. SCSI Host Adapter Card Control Register Mapping
Table G-1.
Ultra SCSI Host Adapter Card
Control Register Mapping
I/O Addr. Function
n00h-n1Fh SCSI Register Array
n20h-n5Fh Scratch RAM
n60h-n7Fh Phase Engine (Sequencer)
n80h-n9Fh Host Registers
n00h-nFFh SCB Array
n = prefix address supplied by the BASEADR0 PCI Config. Reg.
G.4 SPECIFICATIONS
The operating specifications are listed in Table G-2.
Table G–2. Ultra SCSI Host Adapter Card Specifications
Table G-2.
Ultra SCSI Host Adapter Card Specifications
Operating Voltage +5 VDC
Maximum Current Draw 2 A
Operating Temperature 32°F (0°C) to 131°F (55°C)
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