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80 Your system unit

now ready for the power-on

self test (POST). Go to Section 1,

"Introduction/Installation" for a description of

this test.

Note:

you have any problems after the

installation, one of the following

the most

likely cause:

• Cables are connected incorrectly.

• Switches are set incorrectly.

• Other options may have loosened.

• The option you just installed

is defective.

Option Installation

4-75

Questions and Answers:

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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)