IBM PC 300GL Types 6275, Техническое руководство

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Chapter 2. System-Board Features
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Limited power to hubs
For information on the connector pin assignments for the USB interface, see “USB Port Connectors” on
page 37.
Video Subsystem
The video subsystem on the system board includes the Integrated AGP S3 Trio3D SVGA (super video
graphics array) controller. The system board supports up to two SGRAM memory modules. Each module
contains 2 MB of SGRAM memory.
Integrated AGP S3 Trio3D SVGA (Super Video Graphics Array)
The Integrated AGP S3 Trio3D SVGA (super video graphics array) supports all video graphics array
(VGA) modes and is compliant with super video graphics array (SVGA) modes and Video Electronics
Standards Association (VESA) 1.2. Some enhanced features are:
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Plug and Play support
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100 MHz SGRAM support
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Advanced Power Management support
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Color space conversion
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Hardware scaling
The PC 300GL has an AGP bus and is AGP 1.0 compliant. The S3 Trio3D video subsystem supports the
VESA Display Data Channel (DDC) standard 1.1 and uses DDC1 and DDC2B to determine optimal values
during automatic monitor detection.
The video subsystem has the following resource assignments:
Figure 2. Video Subsystem Resources
Resource Assignment
ROM (hex) C0000–C7FFF (32KB)
RAM (hex) A0000–BFFFF
I/O (hex) VGA, Sequencer, CRT controller, graphics controller, attribute, RAMDAC, extended sequencer, extended
CRTC Registers
IRQ PCI interrupt #2 (automatically assigned to ISA IRQ 9 by POST or can be disabled in Setup Utility)
DMA None
For further information on resource assignments, see Appendix B, “System Address Maps” on page 40
and Appendix C, “IRQ and DMA Channel Assignments” on page 44.
The PC 300GL supports the following video subsystem modes:
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Technical Information Manual