IBM ThinkPad 755CX Manual page 235

Problem
When you use DOS Shell
or some kind of
application in the DOS
environment, the lines on
the screen are disordered.
(755CX SVGA model
only)
Verify that:
If you are using DOS Shell and set the screen mode 800-by-600 resolution
by PS2 MODE3X command, do the following:
1. At the DOS Shell screen, select Options from the menu bar; then select
Display....
2. Select Graphics 30 lines Medium Resolution 1; then select OK.
The screen will recover.
If you are using other application than DOS Shell, do the following:
– At the DOS command prompt, type PS2 MODE3X OFF; then press
Enter.
What If Your Computer Does Not Work?
Action
Chapter 8. Solving Computer Problems
219