Specifications

256-byte battery-backed CMOS SRAM

Includes date alarm

• 16-bit counters/timers based on 82C54

Accelerated Graphics Port (A.G.P.)

The Accelerated Graphics Port (A.G.P.) is a high-performance interface for graphic-

intensive applications, such as 3D applications. A.G.P. is independent of the PCI bus

and is intended for exclusive use with graphical-display devices. A.G.P. provides these

performance features:

• Pipelined-memory read and write operations that hide memory access latency.

• De-multiplexing of address and data on the bus for near 100 percent bus efficiency.

• AC timing for 133 MHz data transfer rates, allowing data throughput of

500MBYTES/sec.

• A.G.P. complies with the 66 MHz PCI specification.

Universal Serial Bus (USB)

The motherboard has two USB ports; one USB peripheral can be connected to each

port. For more than two USB devices, an external hub can be connected to either port.

The motherboard fully supports the universal host controller interface (UHCI) and uses

UHCI-compatible software drivers. USB features include:

• Self-identifying peripherals that can be plugged in while the computer is running.

• Automatic mapping of function to driver and configuration.

• Supports isonchronous and asynchronous transfer types over the same set of wires.

• Supports up to 127 physical devices.

• Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other

applications.

• Error-handling and fault-recovery mechanisms built into the protocol.

IDE Support

The motherboard has two independent bus-mastering PCI IDE interfaces. These

interfaces support PIO Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM), and Ultra

DMA/33 synchronous-DMA mode transfers. The BIOS supports logical block

addressing (LBA) and extended cylinder head sector (ECHS) translation modes. The

BIOS automatically detects the IDE device transfer rate and translation mode.

Programmed I/O operations usually require a substantial amount of processor

bandwidth. However, in multitasking operating systems, the bandwidth freed by bus

mastering IDE can be devoted to other tasks while disk transfers are occurring.