Filter
Top Products
• Auto power-down and wake-up modes
• Typical current consumption during power-down is less than
10A
4.2.3
Video Subsystem
The video subsystem, implemented on the Main Board and on the LCD
Display Unit, displays text, graphics and drives an external SVGA port. The
video subsystem is implemented with a Cirrus Logic CL-GD 7543 high
performance VGA controller and supporting logic and video RAM (1 MB).
The major features of the VGA controller include:
•
Highly integrated design (flat panel / CRT VGA controller, RAMDAC,
clock synthesizer)
•
Multiple Bus Architecture Integrated Interface
• Local Bus (32-bit CPU Direct and VL)
• EISA/ISA (PC/AT) 16-bit Bus
•
Integrated programmable linear address feature accelerates GUI
performance
•
Supports panel resolutions up to 1280 X 1024 resolution including 800
X 600 and 1024 X 768
•
SMARTMAP intelligent color to gray scale conversion enhances text
legibility
•
Text enhancement feature improves white text contrast on flat panel
displays
•
Fully Compatible with IBM SVGA
4.2.3.1 External SVGA Drive Capability
The Extensa 57Xcontains an external SVGA port (15-pin, female, D-type
connector) which can be used to drive an external CRT (standard SVGA
modes with resolutions of 800 X 600 X 256, or 640 X 480 X 256).
4.2.4
Hard Disk Subsystem
The Hard Disk Subsystem, controlled by the IDE interface compatible
82C558N IPC chip, provides disk storage for all system software and user
files. Initially, the 57X Series Notebooks are equipped with a removable 810
or 1200 Million Byte hard drive.
During the manufacturing process, Texas Instruments formats the hard
disk and then loads all supplied software including Windows 95.
4-6
Theory of Operation