User guide

PH440 NLX Motherboard User Guide September 1998
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION PAGE 22 OF 51
2D Display modes and maximum frame rates
3
256 colours 65536 colours 16.7M colours
2MB 2MB 4MB 2MB 4MB
640 x 480 200 200 200 200 200
800 x 600 200 200 200 160 160
1024 x 768 150 150 150 120
1152 x 864 120 120 120 85
1280 x 1024 100 100 85
1600 x 1200 76 76
Frame
Buffer
MB
Screen
Resolution
Colour
Depth
Bits/pixel
Display
Buffer
4
MB
Z Buffer Texture
Memory
5
MB
2 512 x 384 16 0.38 x 2 0.38 0.88
2 640 x 480 16 0.59 x 2 0.59 0.24
4 640 x 480 16 0.59 x 2 0.59 2.24
4 640 x 480 32 1.17 x 2 0.59 1.07
4 800 x 600 16 0.92 x 2 0.92 1.25
8 1024 x 768 32 3.00 x 2 1.50 0.50
8 1280 x 1024 16 2.50 x 2 2.50 0.50
AGP
The Accelerated Graphics Port (AGP) is hardware interconnect designed to improve the
performance of 3D graphics displays. The specification is based on PCI but is point-to-point and
provides for data rates over 500MBps. The implementation on this motherboard is a private local
bus between the chipset and the Rage Pro video controller. The bus can operate in 1X or 2X
modes as defined by the AGP specification. When a Rage IIc device is fitted the interface
between the 443BX North Bridge and the VGA controller operates as a 66MHz PCI bus and no
AGP signalling occurs.
Two levels of performance gain are achieved:
♦
2D Operation. Since the AGP operates at 66MHz, twice the data rate of the PCI bus is
available to normal video traffic.
♦
3D Operation (Rage Pro only). Address translation logic and 133MHz bus mastering
allows the video controller to maintain texture information in main memory - reducing the
need for a large frame buffer.
3
These are the primary display modes. Others are available.
4
Front and back buffers.
5
Main memory can be used for additional texture storage via AGP.