Chapter 2 System Overview
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition – September 1998
2-14
2.4.5 SERIAL AND PARALLEL INTERFACES
All models include two serial ports and a parallel port accessible at the rear of the chassis. The
serial and parallel ports are integrated into a PC87307 I/O Controller component. The serial port
is RS-232-C/16550-compatible and operates at baud rates up to 115,200. The parallel interface is
Enhanced Parallel Port (EPP1.9) and Enhanced Capability Port (ECP) compatible, and supports
bi-directional data transfers.
2.4.6 UNIVERSAL SERIAL BUS INTERFACE
All models feature two Universal Serial Bus (USB) ports that provide a high speed interface for
future systems and/or peripherals. The USB operates at 12 Mbps and provides hot
plugging/unplugging (Plug ’n Play) functionality.
2.4.7 GRAPHICS SUBSYSTEM
The graphics subsystem is conatained on a card installed into the AGP slot. Two types of
graphics controllers are used, depending on the microprocessor employed on the system board as
indicated in Table 2-3.
Table 2–3.
Graphics Subsystem Comparison
Table 2-3.
Graphics Subsystem Comparison
266-/300-/333-MHz Processor 350-/400-/4500 MHz Processor
Graphics Controller ATI Rage Pro Turbo AGP ATI Rage Pro Turbo AGP 2X
Graphics Memory
Standard installed:
Expandable to:
4 MB SGRAM
N/A
4 MB SGRAM
8 MB SGRAM
Maximum Resolution
w/ standard mem.
w/ max. mem.
1600 x 1200 @ 65K colors
--
1600 x 1200 @ 65K colors
1600 x 1200 @ 16.7M colors
2.4.8 AUDIO SUBSYSTEM
All models feature the Compaq Premier Sound system. The system board includes an embedded
16-bit full-duplex subsystem based on the ES1869 graphics controller. The audio output is
processed through a six-level equalizer designed to work with the chassis acoustics. A low-
distortion 5-watt amplifier drives a long-excursion speaker for optimum sound. The audio
subsystem is compatible with software written for industry-common sound hardware.
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