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4-16 www.hp.com Technical Reference Guide

System Support

■ Chassis and board ID

■ Hood (cover) sensor and lock detect

■ Media card reader detect

■ S4 state indicator

■ USB port over-current detect

■ Flash security override

■ Serial port detect

■ REQn#/GNTn# sigal control

■ Password enable

■ Boot block enable

I/O Controller Functions

In addition to the serial and parallel port functions, the SCH5327 I/O controller provides the

following specialized functions through GPIO ports:

■ Power/Hard drive LED control for indicating system events (refer to Table 4-8)

■ Hood lock/unlock controls the lock bar mechanism

■ Thermal shutdown control turns off the CPU when temperature reaches certain level

■ Processor present/speed detection detects if the processor has been removed. The occurrence

of this event will, during the next boot sequence, initiate the speed selection routine for the

processor.

■ Legacy/ACPI power button mode control uses the pulse signal from the system's power

button and produces the PS On signal according to the mode (legacy or ACPI) selected.

Refer to chapter 7 for more information regarding power management.

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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