IBM 5155 User Manual

29 Turn the Brightness control fully clockwise.
Turn the Contrast control fully
counterclockwise.
~ - - ----"----"
Brightness
Control
30 Does the intensity of the characters decrease?
YES - Go to the next step.
NO - Have the display serviced.
January
1984
Test 9000-11

IBM 5155 Specifications

General

Model	IBM 5155
Category	Desktop
Release Year	1984
CPU	Intel 8088
Clock Speed	4.77 MHz
Display	9-inch monochrome CRT
RAM	256 KB, expandable to 640 KB
Storage	One or two 5.25" 360KB floppy disk drives
Graphics	CGA (Color Graphics Adapter)
Ports	Parallel, Serial, Keyboard
Operating System	IBM PC DOS
Weight	30 pounds (13.6 kg)