HP Compaq dc7800 Series User Manual

4-8 www.hp.com Technical Reference Guide
System Support
NOTES:
[1] SFF and CMT only
[2] CMT only
The PCI interrupts can be configured by PCI Configuration Registers 60h..63h to share the
standard ISA interrupts (IRQn).
✎
The APIC mode is supported by Windows NT, Windows 2000, and Windows XP, and Windows
Vista operating systems. Systems running the Windows 95 or 98 operating system will need to
run in 8259 mode.
4.3.2 Direct Memory Access
Direct Memory Access (DMA) is a method by which a device accesses system memory without
involving the microprocessor. Although the DMA method has been traditionally used to transfer
blocks of data to or from an ISA I/O device, PCI devices may also use DMA operation as well.
The DMA method reduces the amount of CPU interactions with memory, freeing the CPU for
other processing tasks. For detailed information regarding DMA operation, refer to the data
manual for the Intel 82801 ICH9 I/O Controller Hub.
Table 4-5.
PCI Interrupt Distribution
System Interrupts
System Board
Connector
PIRQ
A
PIRQ
B
PIRQ
C
PIRQ
D
PIRQ
E
PIRQ
F
PIRQ
G
PIRQ
H
PCI slot 1 [1] A B C D
PCI slot 2 [1] D A B C
PCI slot 3 [2] C D A B

HP Compaq dc7800 Series Specifications

General

Processor	Intel Core 2 Duo, Intel Pentium Dual-Core, Intel Celeron
Chipset	Intel Q35 Express
Memory	Up to 8 GB DDR2 SDRAM
Audio	Integrated High Definition Audio
Form Factor	Ultra-slim desktop, Small form factor, Convertible minitower
Storage	80GB to 500GB SATA HDD
Graphics	Integrated Intel Graphics Media Accelerator 3100
Optical Drive	DVD-ROM, DVD+/-RW
Network	Integrated Gigabit Network Connection
Ports	USB 2.0, VGA, serial, parallel, audio in/out
Operating System	Windows Vista, Windows XP, FreeDOS
Expansion Slots	1 low-profile PCI, 1 low-profile PCI Express x16
Power Supply	240W