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Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition -September
2-11
2.4.3 SUPPORT CHIPSET
Table 2-2 shows the chipsets used for the Deskpro 4000N and 4000S systems.
Table 2–2.
Support Chipsets
Table 2-2.
Support Chipsets
Function Component
Host/PCI (North) Bridge:
System Controller
Data Buffer
VT82C595
“
“
PCI/ISA (South) Bridge:
EIDE Controller
DMA Controller
Interrupt Controller
Timer/Counter
NMI Registers
Reset Control Reg.
USB I/F
VT82C586
“
“
“
“
“
“
“
I/O Controller:
Keyboard I/F
Diskette I/F
Serial I/F
Parallel I/F
RTC/CMOS Mem.
GPIO Ports
87307
“
“
“
“
“
“
2.4.4 MASS STORAGE
A 1.6- or 2.1-GB EIDE hard drive may be installed, depending on series/model. All models
include a PCI bus mastering Enhanced IDE (EIDE) controller that provides two EIDE interfaces
supporting two IDE devices. Master/slave drive selection is determined using the cable-select
method, eliminating the need to move jumpers when re-configuring drives. The mass storage
drive bay capacity is determined by the form factor (refer to Section 2.3, Mechanical Design). All
Deskpro 4000S models include a 3.5 inch 1.44-MB diskette drive installed.
2.4.5 SERIAL AND PARALLEL INTERFACES
All models include two serial and one parallel port available at the rear of the unit chassis. The
serial and parallel ports are integrated into a PC87307 I/O Controller component. The serial
ports use 16550/16450-equivalent logic and are RS-232-C compatible and operate 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.