American Megatrends MAN-772 Mouse, CPU External Clock Frequency PCI Expansion Slot Frequency

Overview, Continued

Mouse	The Apollo IV motherboard includes a 5-pin berg mouse connector.
USB	The Apollo IV motherboard has two 4-pin USB connectors. USB allows
	future generations of USB-compliant peripheral devices to be automatically
	detected and configured through a single port. USB uses Plug and Play
	technology. All USB peripherals are automatically detected and configured.
	The AMIBIOS on this motherboard provides complete USB system BIOS
	support.

Power Connectors The Apollo IV motherboard has three power supply connectors.

RTC/CMOS RAM A real time clock and 128 bytes of CMOS RAM with a battery backup is provided on the motherboard.

Power Management Power management services include:

∙Green PC LED,

∙power management signal to Green PC-aware power supplies,

∙automatic IDE and video power down,

∙monitor blanking,

∙SMI (System Management Interrupt) support,

∙APM, and

∙system stop clock.

PCI Slots The motherboard conforms to the PCI Version 2.1 specification. The concurrent PCI architecture of this motherboard allows faster CPU, PCI, and ISA bus transactions for faster and smoother multimedia performance. This motherboard allows you to install either PCI V2.0 or PCI V2.1-comaptible adapter cards

The PCI slots are automatically configured by the AMIBIOS. The PCI slots operate synchronously with the CPU clock, as follows:

CPU External Clock Frequency		PCI Expansion Slot Frequency
	66 MHz	33 MHz
	60 MHz	30 MHz

Onboard I/O The Apollo IV Pentium ISA motherboard includes:

∙two 40-pin IDE connectors on the PCI bus that support up to four IDE drives,

∙a 34-pin floppy drive connector,

∙two 10-pin serial port connectors (with 16550 UARTs),

∙a 26-pin parallel port connector with ECP and EPP support,

∙an infrared connector,

∙two USB connectors that support an optional riser card that permit high speed Plug and Play connection to USB-compliant external peripheral devices,

∙a keyboard connector, and

∙a PS/2 mouse connector.

Cont’d

6Apollo IV PCI Pentium ISA Motherboard User’s Guide