Toshiba T2150CD - Handbuch (Seite 85)

The display controller is a hardware controller that formats information for the screen to
display. For example, it interprets a software command to turn a particular pel on or off into
hardware commands that address the specific pixels required to execute the software
command.
The T2150CD series computers’ display controller is an advanced Video Graphics Array
(VGA) that provides Super VGA (SVGA) support for the internal LCD and external
monitors. The LCD panel displays up to 640 horizontal and 480 vertical pixels, which render
25 lines of standard text 80 characters wide. The T2150CDT displays up to 64K colors and
the T2150CDS displays up to 256 colors. A high-resolution external monitor connected to a
T2150CD series computer can display up to 1024 horizontal and 768 vertical pixels and up
to 64K colors.
The advanced display controller lets you run VGA-compatible software, which includes most
popular software.
The T2150CD series is equipped with a local video bus for superior performance of your
display. The T2150CD series computers can display on both the internal LCD and external
CRT at the same time. You also have the option of displaying on the LCD only or on the
CRT only.
The software utilities that come with the T2150CD series computer provide drivers that
accelerate Windows graphics and improve performance for both the internal display and an
external monitor. Refer to
Chapter 10, Toshiba Utilities and Drivers , for information on
installling the drivers.
Video RAM
The T2150CD series provides 1MB of RAM for video display.
Video Modes
The video mode is controlled by the display controller, which uses industry standard rules to
govern the screen resolution and the maximum number of colors that can be displayed on
screen. These standard rules are called video modes.
Software written for a given video mode will run on any computer that supports the mode. An
application’s video mode depends on the screen resolution required, the number of colors
used, the font size and whether it runs in text or graphics mode.
The T2150CD series computers’ display controller supports all VGA and SVGA modes.
There are two basic types of video modes: text mode and graphics mode. Refer to the