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Hardware Installation Models 25/30
Installing the SLC/Now! Processor Upgrade Card in your
IBM PS/2 Models 25 286 and 30 286.
1.
Set the power switch on the system unit to OFF.
2.
Set all external power switches off, (i.e. display, printer, etc.).
3.
Unplug the system unit's power cord from the power outlet.
4.
Disconnect all power cords from the rear of your machine.
5.
Move your keyboard and all external options away from the work area.
6.
Position the unit to allow access to the rear.
7.
Using a flat-blade screwdriver or the finger grips, remove the cover mounting screws.
8.
Unlock the system cover and carefully slide the system unit's cover away from the rear and to the
front. When the cover will go no further, tilt it up, remove it from the base and set it aside.
9.
Unscrew and remove any adapter cards, being careful to note their position.
10.
Before removing the 80286 and the 80287 coprocessor, (if a coprocessor is installed), note the
location of Pin 1 on each processor, (identified by either a notch, beveled edge, dot; or a half-circle
on the 80287 coprocessor).
Note:
The position of Pin 1 on the 80286 processor socket must match Pin 1 on the SLC/Now!.
11.
Using the PLCC Extractor insert the steel tongs into the two notches on the 80286 chip socket, (on
the system board). Squeeze the grips of the PLCC extractor tool together and carefully remove the
80286 from the socket while gently rocking side to side. (Save the 80286 microprocessor in the event
you need to temporarily return to the old configuration.)
12.
If you have an 80287 coprocessor installed, this must also be removed. Locate the 80287 coprocessor
as shown in figure 4 and insert the IC removal tool under the corner of the chip. Gently pry upwards,
repeat for all four corners. Once the pins have been sufficiently exposed remove with your fingers.
(Save the 80287 coprocessor in the event you need to temporarily return to the old configuration.)
13.
If you are adding an 80387SX math coprocessor, identify pin 1 of the math coprocessor chip,
(designated by either a beveled edge, dot, notch or half-circle). Match this corner to the bevelled edge
for the math coprocessor on the 386SLC or the 486SLC2 Cached Processor Upgrade Card. Note the
arrow in the coprocessor socket pointing to Pin 1. Carefully place the coprocessor into the socket
located on the upgrade card being sure to align the pins and the connector. Firmly press the module
into place. (The pins of the module are easily damaged and must be aligned with the connector before
pressing the module into place.)
14.
Align the beveled edge of the 80286 outline on the SLC/Now! with pin 1 on the 80286 socket. Press
gently into place, applying an even pressure. (If the SLC/Now! is not positioned correctly, damage
to both your IBM PS/2 and the upgrade card may result.)
Kingston Technology Corporation
SLC/Now! Installation Guide - Rev. D1
5
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