Acer Altos G500 manual System chipsets, VIA Pro266T chipset, Scsi subsystem

4 1 System overview

Note: The DDR SDRAM module should work under 3.3 volts only; 5-volt memory devices are not supported.

The mainboard supports 266 MHz DDR-SDRAM (PC-2100) module.

System chipsets

VIA Pro266T chipset

The VIA Pro266T chipset was specifically designed to meet the needs of high performance systems. It consists of two components: VT8653 (north bridge) and VT8233 (south bridge).

•VT8653 (north bridge) provides the host interface, memory system control interface, PCI interface, and AGP interface to boost graphics performance.

•VT8233 (south bridge) integrates super I/O functions like keyboard and mouse interface, floppy disk controller, advanced digital data separator, two compatible serial ports (UARTs), one parallel port, on-chip 12 mA AT bus drivers, one floppy direct drive support, and Intelligent Power Management (IPM) support.

SCSI subsystem

The dual-channel AIC-7899 single-chip host adapter delivers Ultra 160/m SCSI data transfer rates which double the Ultra-2 SCSI data transfer rate of up to 160 MByte/s. With two channels, it delivers a total of 320 MByte/s bandwidth. In addition, the AIC-7899 features a 66 MHz, 64-bit PCI interface that supports zero wait-state memory which also operates on 33 MHz, 32-bit PCI buses. It supports up to 15 devices on a 12-meter cable (or 25 meters in a point-to-point configuration), making it ideal for both clustering and RAID configurations.