External Option Installation 
Instructions 
This section contains 
the 
installation instructions for 
options 
that 
attach 
to 
the 
OUTSIDE 
of 
your IBM 
Personal 
Computer 
AT.  The 
order 
that 
options appear 
in this section 
is 
the suggested order for installation. 
Refer 
to 
the 
table 
of 
contents for this section 
to 
find 
the starting page 
number 
for your option installation 
instructions. 
Required Tools 
•  Medium-size, flat-blade screwdriver 
•  Medium-size, Phillips screwdriver (printers only) 
Optional Tools 
•  Medium screwstarter 
• 
3/
16-inch nutdriver 
• 
1/
4-inch nutdriver 
External Option Installation 
5-3