Intergraph TD-x10 Setup, Справочное руководство системы

Страница: 59 / 98

49
Lithium Battery (CMOS/Clock Battery)
When the system is off, the Lithium battery on the system board provides power to the real time clock
and BIOS flash EPROM, which stores the BIOS information. As long as the system is running, the
batteries are not used to sustain the information. If the battery fails, the system date and time will be
lost and the BIOS will not be installed when the system is rebooted. To replace a failed battery, refer
to Chapter 2, “Servicing the Desktop System” or Chapter 3, “Servicing the Deskside System.”
Graphics Chipset
G95 Accelerator
The graphics accelerator (Matrox MGA-2064W) interfaces to the system board through the PCI bus.
This accelerator supports all of the standard VGA graphics modes in addition to native modes capable
of resolutions up to 1600 x 1200. The frame buffer interface is 64 bits wide and is clocked at 100
MHz. Color depths of 4, 8, 16, 24, and 32 bits are supported, allowing a resolution of 1280 x 1024 (24
bit color depth) in only 4 MB of frame buffer memory. Features such as bit block transfer (BitBlt),
Line Draws, and Fills provide hardware acceleration for Windows. Video playback is accelerated
through scaling and YUV to RGB color space conversion.
Palette DAC
The palette DAC operates up to 175 MHz and converts the digital RGB data in the frame buffer to
analog signals for the monitor. The device includes two fully programmable phase-locked loop clock
sources for both the memory clock and the pixel clock.
Window RAM
Window RAM (WRAM) is the video memory used by the MGA-2064W. The graphics frame buffer
consists of two 256K x 32 WRAM components for 2 MB of video memory. WRAM is a dual-ported
video memory specially designed to accommodate common drawing functions, offering higher graphics
performance at a lower cost than standard Video RAM.
Starting with 2 MB WRAM, a 2 MB or 6 MB WRAM mezzanine module can be added for improved
video performance. 8 MB of WRAM is the maximum amount configurable. Memory above 2 MB
increases the number of colors available at each resolution, enabling you to work in true color mode at
higher resolutions. Increased WRAM also improves color acceleration by providing extra caching
memory for storing off-screen fonts and images.
VGA Mode Jumper
The VGA mode jumper (J25) enables or disables the G95 VGA mode on motherboards equipped with
the G95 graphics chipset. By default, the jumper is not installed (OFF), which enables VGA mode. If
the jumper is installed (ON), the VGA mode is disabled.
NOTE You must remove the PCI option boards and the processor module (or P6 bus termination card) to
access the VGA mode jumper.