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5 ·Turn the Vertical Size control clockwise until the

black areas

the top and bottom of the screen

disappear.

one

the black areas disappears

before the other, continue to turn the control

until the second black area also disappears.

6 Adjust the Brightness and Contrast controls for

eye comfort.

•

/ /

Contrast

Brightness

Control

3-36

Color Display

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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)