Compaq 850 manual System Memory, Mass Storage, SERIAL, Parallel Interfaces

Chapter 2 System Overview

2.4.4 SYSTEM MEMORY

These systems feature a dual-channel Direct Rambus (RDRAM) architecture. Capable of a peak data throughput of 3.2 GB/sec., this high-performance memory design represents a new generation of memory subsystems that can keep pace with ever-increasing processor performance. These systems each provide a total of four RIMM sockets, all of which will be populated with either PC800 RDRAM memory modules (RIMMs) or continuity modules (CRIMMs). Up to two gigabytes of memory may be installed.

Compaq Deskpro EXS systems are shipped with non-ECC PC800 RIMMs. Compaq Deskpro Workstation 300 systems are shipped with ECC PC800 RIMMs. Both systems support ECC and non-ECC RIMMs.

2.4.5 MASS STORAGE

All models include a 3.5 inch 1.44-MB diskette drive installed as drive A. Most models also include a CD-ROM drive. The Deskpro EXS and some Deskpro Workstation 300 models will include a UATA100 (EIDE) hard drive while select Deskpro Workstation 300 models will include an Ultra 160 SCSI controller (PCI) card and SCSI hard drive. Standard hard drives feature Drive Protection System (DPS) support, which uses industry-standard function ATAPI-5 to check drive integrity. Standard drives also use SMART III technology that tests drive data during periods of drive inactivity for corruption.

2.4.6 SERIAL, PARALLEL INTERFACES

All models include two serial ports and a parallel port accessible at the rear of the chassis. Each serial port is RS-232-C/16550-compatible and supports standard baud rates up to 115,200 as well as high-speed baud rates of 230K and 460K, and uses a DB-9 connector. The parallel interface is Enhanced Parallel Port (EPP1.9) and Enhanced Capability Port (ECP) compatible, and supports bi-directional data transfers through a DB-25 connector.

2.4.7 UNIVERSAL SERIAL BUS INTERFACE

All models feature four Universal Serial Bus (USB) ports that provide a 12Mb/s interface for peripherals. The USB provides hot plugging/unplugging (Plug ’n Play) functionality.

2-12Compaq Deskpro EXS and Workstation 300 Personal Computers Featuring the Intel Pentium 4 Processor

First Edition – December 2000