IBM Personal Computer User Manual

Power-On Self Test (POST)
If you have an expansion unit attached to your Personal
Computer, the expansion unit must
always be turned on
first unless otherwise indicated. If this is not done, an
error is indicated on the display. To recover, power
must be turned off
on all devices then power turned on
with the expansion unit being turned on before the
system unit.
When you first set the system unit's Power switch to
On a power-on self test (POST) occurs. The POST
takes 13
to 90 seconds depending on the amount of
memory installed.
1 Set the Power switch on the expansion unit (if
attached) to On.
2 Turn on all attached devices, then set the system
unit Power switch to On. There will normally
be
three responses: ~
A The cursor will appear on the screen in
approximately 4 seconds.
B One short beep will
be heard after the
memory
is tested.
C The IBM Personal Computer BASIC
message will appear
on the screen.
2-14 Setup

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