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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
2-13
2.4.2 SYSTEM MEMORY
This system provides three 168-pin DIMM sockets with 16, 32 or 64 megabytes of RAM
installed depending on model. System memory can be expanded up to 384 megabytes using 16-,
32-, 64-, and 128-MB DIMMs. This system supports SDRAM, EDO, and ECC DIMMs. Models
3200 and 6400 come with SDRAM installed while models 4300 and 9100 come with ECC
DIMMs installed. Non-parity DIMMs are installed as standard but parity DIMMs are supported.
2.4.3 SUPPORT CHIPSETS
Table 2-2 shows the functions provided by the key components on the system board.
Table 2–2.
Support Chipsets
Table 2-2.
Support Chipsets
Component Name Component Type Function
PCI Arbitration Controller (PAC) North Bridge 82443BX Memory Controller
Host/PCI Bridge
PCI-ISA/IDE eXcelerator (PIIX4E) South Bridge 82371 PCI/ISA Bridge
EIDE Controller
DMA Controller
Interrupt Controller
Timer/Counter
NMI Registers
Reset Control Reg.
USB I/F (2)
Super I/O Controller 87307 Keyboard I/F
Diskette I/F
Serial I/F
Parallel I/F
RTC/CMOS Mem.
GPIO Ports
Clock Generator CY2280 Clock Generator
System Security ASIC Compaq ASIC Super I/O Security
Smart Cover Lock
ROM Write Protect
Temperature Shutdown
SM/WOL Interrupts
Diskette Write Disable
Pwr LED Blink Cntrl.
PS On sig. Cntrl.
2.4.4 MASS STORAGE
All models include a 3.5 inch 1.44-MB diskette drive installed. Either an EIDE or SCSI hard
drive is also installed, depending on model. All models include a PCI bus mastering Enhanced
IDE (EIDE) controller that provides two EIDE interfaces supporting up to four IDE devices.
Models equipped with a SCSI drive include a Wide Ultra SCSI adapter board. A 32x CD-ROM is
included on desktop CDS models and on all MT models.