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IBM PCjr

IBM PCjr
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7. Plug
the
service plug
into
the system unit connectors
J.
Connector
J
Service
Plug
2-6
8.
Turn
the
display's
brightness,
contrast,
and
volume
controls
to
mid-range.
9.
Set
the
display's
Power
switch
to
On.
10.
Set
the
system
unit's
Power
switch
to
On.
Advanced
POST
begins as
soon
as
the
system
unit
Power
switch
is
set
to
On.
It
takes
as
long
as
one
minute
to
complete.
While
advanced
POST
is running:
•
You
see
a
stable
IBM
logo
and
16-color
test
pattern
on
your
screen.

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