Processor/Memory Subsystem; System Memory; Mass Storage; Serial And Parallel Interfaces - HP Deskpro EX Technical Reference Manual

2.4.4 SYSTEM MEMORY

These systems support and come configured with PC133 SDRAM and provide two DIMM sockets
with at least one socket populated with a single- or double-sided memory module. Up to 512
megabytes of memory may be installed using one or two DIMMs.
NOTE: There are restrictions on PC133 operation.
These restrictions are described in Chapter 3 "Processor/Memory Subsystem."

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 and either a 10-, 15-, or 20-GB 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. All systems provide two (one primary, one secondary) PCI bus-
mastering Enhanced IDE (EIDE) controllers integrated into the chipset. Each controller provides
UATA/66 support for two drives for a total of four IDE devices (form factor limitations
notwithstanding).

2.4.6 SERIAL AND 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 two high-speed baud rates of 230K and 460K, and use DB-9 connectors. 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 two Universal Serial Bus (USB) ports that provide a 12Mb/s interface for
peripherals. The USB provides hot plugging/unplugging (Plug 'n Play) functionality.
Compaq Deskpro EX Series of Personal Computers
First Edition - August 2000
Technical Reference Guide
2-15