IBM Personal Computer User Manual

Vertical Hold Control
Use this control (as described below) only if your
screen presentation
is rolling from top-to-bottom or
bottom-to-top.
IBM Color Display
'-~
o
Vertical Hold
Control
1 Set the system unit Power switch and the display
Power switch to On.
2 Wait for the completion of POST.
3 Turn the Vertical Hold control clockwise as far
as it will go, then turn it counterclockwise until
the screen presentation stops rolling.
3-10 Displays

IBM Personal Computer Specifications

General

Manufacturer	IBM
Model	IBM Personal Computer 5150
Release Year	1981
Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Graphics	MDA or CGA
Power Supply	63.5 W
Weight	21 lbs (9.5 kg)
Storage	5.25-inch floppy disk drives, optional 10 MB hard drive
Operating System	IBM PC DOS
Ports	Parallel, Serial, Cassette