IBM 5155 User Manual

Vertical Hold Adjustment
This adjustment is required only if your mM Color
Display has a vertical-hold problem (screen
is rolling
from top
to bottom or from bottom to top.)
Vertical Hold
Control
1 Set the Power switch on the system unit, and the
Power control
on the display, to On.
2 Wait for the POST to finish.
3 Tum the Vertical Hold control clockwise as far
as it
will go, then tum it counterclockwise until
the screen stops rolling and
is steady.
3-34 Color Display

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)