4100 MT  (250-5160)            Adding Memory           Faxback Doc. # 2775

Warning: This CPU does not support 8 MB SIMMS.  This CPU does not
         support double sided SIMMS.
       
NOTE: The 32 bit SIMMS for this CPU are available through Third Party
      Products.  The 4 MB (1x32) SIMM Kit can be ordered under
      Catalog #. 250-5138.

To add system memory, follow these steps:

     1.  Turn the computer off, unplug the power and phone cords,
         disconnect all peripheral devices, remove the system-unit-cover,
         and move the internal drive bay.

     2.  For better access to the SIMM sockets, remove the power supply:
         Use a Phillips screwdriver to remove the four power supply screws
         on the back of the computer.  Pull the power supply out and place
         it next to the chassis.

Note:  To prevent the power supply from dropping onto the system board,
       hold it with one hand while removing the screws.

     3.  Select the sockets into which you will insert the SIMMs.  Fill
         sockets in sequence; for instance, fill socket 0 before socket 1.

Total Memory   Socket 0    Socket 1    Socket 2    Socket 3

1 MB           1-MB        Empty       Empty       Empty
2 MB           1-MB        1-MB        Empty       Empty
3 MB           1-MB        1-MB        1-MB        Empty
4 MB           1-MB        1-MB        1-MB        1-MB
4 MB           4-MB        Empty       Empty       Empty
5 MB           4-MB        1-MB        Empty       Empty
6 MB           4-MB        1-MB        1-MB        Empty
7 MB           4-MB        1-MB        1-MB        1-MB
8 MB           4-MB        4-MB        Empty       Empty
9 MB           4-MB        4-MB        1-MB        Empty
10 MB          4-MB        4-MB        1-MB        1-MB
12 MB          4-MB        4-MB        4-MB        Empty
13 MB          4-MB        4-MB        4-MB        1-MB
16 MB          4-MB        4-MB        4-MB        4-MB
16 MB          16-MB       Empty       Empty       Empty
17 MB          16-MB       1-MB        Empty       Empty
18 MB          16-MB       1-MB        1-MB        Empty
19 MB          16-MB       1-MB        1-MB        1-MB
20 MB          16-MB       4-MB        Empty       Empty - Not Supported
21 MB          16-MB       4-MB        1-MB        Empty
22 MB          16-MB       4-MB        1-MB        1-MB
24 MB          16-MB       4-MB        4-MB        Empty
25 MB          16-MB       4-MB        4-MB        1-MB
28 MB          16-MB       4-MB        4-MB        4-MB
32 MB          16-MB       16-MB       Empty       Empty
33 MB          16-MB       16-MB       1-MB        Empty
34 MB          16-MB       16-MB       1-MB        1-MB
36 MB          16-MB       16-MB       4-MB        Empty
37 MB          16-MB       16-MB       4-MB        1-MB
40 MB          16-MB       16-MB       4-MB        4-MB - Not Supported
48 MB          16-MB       16-MB       16-MB       Empty
49 MB          16-MB       16-MB       16-MB       1-MB
52 MB          16-MB       16-MB       16-MB       4-MB
64 MB          16-MB       16-MB       16-MB       16-MB

Note:  Use only memory upgrade kits from your Radio Shack store or
       participating dealer.  Only 70-ns or faster, 32-bit SIMMs should
       be used.  Other memory upgrades might not work correctly in your
       computer.

     4.  Remove SIMMs if necessary.  You cannot remove a SIMM without
         first removing any SIMMs located below it.  To remove a SIMM,
         carefully pull the plastic retaining clips sideways and push
         the SIMM down slightly.  Pull the SIMM out of the socket; be
         careful to avoid damage.

     5.  When installing SIMMs, insert the SIMM in the highest empty
         socket first.  Carefully push the SIMM into the socket until
         it is fully seated.  The easiest method may be to push in the
         right side of the SIMM first and then the left side.  Push the
         SIMM back until it snaps into place.  Install as many SIMMs as
         you need to match the configuration in the table.

     6.  Replace the power supply, internal drive bay, and system-unit
         cover.  Reconnect peripheral devices and plug in the power and
         phone cords.

When you start the computer, it will automatically recognize the change in
memory configuration.

(ALL/all-06/16/94)