Toshiba Portege 7140 - Manual (Page 165)

User's Manual Display Controller and Modes E-1
Version
5
Last Saved on 20/12/99 04:11
Portege 7140CT User's Manual – 7140_UK.doc – ENGLISH – Printed on 20/12/99 as IM_714UK
Appendix E
Display Controller and Modes
Display controller
The display controller interprets software commands into hardware
commands that turn particular pels on or off.
The controller is an advanced Video Graphics Array (VGA) that provides
Super VGA (SVGA) and Extended Graphics Array (XGA) support for the
internal LCD and external monitors. The computer’s LCD panel displays
up to 1024 horizontal and 768 vertical pixels.
Because of the LCD’s increased resolution, lines may appear broken in
DOS mode.
The computer displays up to 16 M colours. A high-resolution external
monitor connected to the computer can display up to 1280 horizontal and
1024 vertical pixels and up to 256 K colours, depending on the video
mode.
The display controller controls the video mode, which uses industry
standard rules to govern the screen resolution and the maximum number
of colours that can be displayed on screen.
Software written for a given video mode will run on any computer that
supports the mode.
The computer’s display controller supports all VGA and SVGA modes, the
most widely used industry standards.
Video modes
The computer supports the video modes defined in the following table. If
your application offers a selection of mode numbers that do not match the
numbers on the table, select a mode based on mode type, resolution,
character matrix, number of colours and refresh rates. Also, consider the
following points:
„ If your software supports both graphics and text modes, the screen
display may appear to operate faster using a text mode.
„ The LCD’s highest graphics resolution is 1024 x 768.