R687AC Specifications :     

Processor : Support VIA C3 processor, over 1Ghz.
Chipset : SiS 630ST, System bus capability (100/133 MHz).
Expansion Slot : PCI Slot :
(1). 2x PCI slots on riser card OR
(2). 1x PCI slot on riser card and 1x IEEE1394 daughter card).
System Memory :  Supports 1 x 168-pin DIMM Socket
(PC100 / PC133 SDRAM)
-The Memory from 32MB up to 512MB.
On Board IDE :  2 x IDE Connectors for up to 4 IDE Drives.
-PIO Mode 4 transfers
-Dual Ultra DMA 33/66/100.
On Board I/O :  2 Serial Port Connectors (16550 Fast UART compatible).
-1 Parallel Port Connectors (EPP/ECP capability).
-1 Floppy Disk Connector.
-1 PS/2 Mouse Connector.
-1 PS/2 Keyboard Connector.
-1 IrDA Connector.
IEEE 1394a (Optional)
on daughter card
IEEE 1394a, 2 x ports. 
Support 400Mbits/s, 200Mbits/s, 100 Mbits/s traffic.
On Board USB :  Universal Serial Bus Controller.
-Host / HUB Controller.
-Two USB Ports + 2 x USB connectors.
On Board VGA : Integrated 128-bit 2D/3D Graphics Accelerator, AGP 4X.
-Shared Memory 2~64MB.
-Advanced HW Acceleration for DVD Playback.
-Fully DirectX 8 Compliant Graphics Engine.
On Board TV-Out :  Built-in SiS301(B version) chip.
-Support NTSC and PAL, 
Resolution : 640x480 / 800x600 / 1024x768 full screen.
-Support DVI (Digital Visual Interface).
On Board Sound : Integrated Audio Controller, Support 2 Speakers.
-AD1881A (AC'97) Codec.
On Board LAN x 2 : Two LAN ports, built-in RTL8139C 10/100 Mbps PCI Lan chip.
BIOS :  Flash ROM BIOS with Green, Plug and Play Features.
Dimension :  Special Form Factor Size.
23cm x 22cm or 9.1" x 8.7" (4 Layers)
 

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