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Chapter 2. System board features
The video subsystem 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 include:
Video subsystem on a chip, including 2D, 3D, and a video port
66 MHz AGP system bus interface with 2X or 4X mode
Sideband signaling (some models only)
Command list bus mastering support for fast 2D performance
64-bit, 125 MHz SDRAM or 166 MHz SGRAM interface
Plug and Play support
Advanced Power Management support
Color space conversion
Hardware scaling
The integrated graphics memory controller 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 registers: Attributes 0–14, CRT controller 0–18/22/24/26, CRTC Extension 0-6, DACSTAT, FEAT, GCTL
0-8, INSTS0-1, MISC, Sequencer 0-4, DAC
IRQ PCI interrupt 1 (automatically assigned to IRQ 0BH by POST or can be disabled in the Configuration/Setup
Utility)
DMA None
For further information on resource assignments, see Appendix B, “System address maps” on page 36
and Appendix C, “IRQ and DMA channel assignments” on page 40.
The PC 300PL Personal Computer supports the following video subsystem modes:
8 Technical Information Manual