ͻ
                                                                         
     Matched Memory Computer Compatibility: IBM Models 35 - L40SX        
                                                                         
ͼ

   IBM PS/2 MODEL 50Z-031, 061

      The PS/2 Model 50Z comes standard with a 1MB module in the system
      board's only memory socket, and is expandable to 2MB by replacing the
      1MB module with a 2MB module. System memory can be further expanded
      by adding an Above Board MC.

      The SIMM connector is located under the hard drive, therefore some
      disassembly is required.

      Intel Matched Memory Compatibility:
            Module     Intel Part     IBM Equivalent
             Size        Number         Part Number
             1MB       PCSM 1170          6450603
             2MB       PCSM 1270          6450604

      ͸
      System  Recommended Memory Upgrade Path   
      Memory Ĵ
      Desired              Slot 1               
      Ĵ
        1 MB  Standard (one 1MB module)*        
      Ĵ
        2 MB         PCSM 1270**                
      Ĵ
      3-16 MB Above Board MC in expansion slot  
      ;

      Configuration Notes:
       *  Use the 1MB module shipped with the PS/2 Model 50Z or PCSM 1170.
       **     Configuration requires replacing the 1MB module which is
          shipped with the PS/2 50Z with the PCSM 1270.

      Installing into the IBM PS/2 50Z
      1.  Turn off system power.
      2.  Remove Floppy(s) - lift tab at center bottom of the floppy and
          pull it forward.
      3.  Remove Floppy interface card.  Some systems may have a retaining
          clip holding the card to the plastic chassis.  In these systems,
          the card can  be removed with the chassis.
      4.  Remove the hard disk - depress the two plastic retaining levers
          and slide the drive out of the connector.
      5.  Remove the hard disk interface card.
      6.  Unsnap and remove fan assembly.
      7.  Unplug speaker wire.
      8.  Unsnap 7 plastic retaining snaps and remove plastic chassis.
      9.  Install the SIMM per instructions and reassemble system.

   IBM PS/2 MODEL 55LS

      The PS/2 Model 55LS comes standard with 4MB memory (a 4MB module in
      memory socket 1 on the system board). The system is expandable to 8MB
      on the system board and to 16MB by adding an Above Board MC in an
      expansion slot.

      Intel Matched Memory Compatibility:
          Module  Intel Part     IBM Equivalent
           Size     Number         Part Number
           1MB        PCSM 1170           6450603
           2MB        PCSM 1270           6450604
           4MB        PCSM 1455           87F9977 or 34F2933
          8-16MB    Above Board MC
                  PSMB 5300

      ͸
      System  Recommended Upgrade PathAlternate
      Memory ĴUpgrade  
      Desired  Socket 1    Socket 2  Path?    
      Ĵ
        4 MB      *                           
      Ĵ
        5 MB      *       PCSM 1170           
      Ĵ
        6 MB      *       PCSM 1270   Note A  
      Ĵ
        7 MB               NA                   
      Ĵ
        8 MB      *       PCSM 1455   Note B  
      Ĵ
      9-16MB  Above Board MC in expansion slot  
      ;

      Configuration Notes:
       *  Use the standard 4MB memory module or PCSM 1455.
       A  An alternate would be to put an Above Board MC with 2MB.
       B  An alternate would be to put an Above Board MC with 4MB.

   IBM PS/2 MODEL 55SX-031

      The PS/2 Model 55SX-031 comes standard with 2MB memory (a 1MB module
      in memory socket 1 and socket 2 on the system board). The system is
      expandable to 8MB on the system board and to 16MB by adding an Above
      Board MC in an expansion slot.

      Intel Matched Memory Compatibility:
          Module  Intel Part     IBM Equivalent
           Size     Number         Part Number
           1MB        PCSM 1170           6450603
           2MB        PCSM 1270           6450604
           4MB        PCSM 1455           87F9977 or 34F2933

          8-16MB    Above Board MC
                  PSMB 5300

      ͸
      System  Recommended Upgrade PathAlternate
      Memory ĴUpgrade  
      Desired  Socket 1    Socket 2  Path?    
      Ĵ
        2 MB      *           *               
      Ĵ
        3 MB  PCSM 1270   Standard**          
      Ĵ
        4 MB  PCSM 1455               Note A  
      Ĵ
        5 MB  PCSM 1455   Standard**          
      Ĵ
        6 MB  PCSM 1455   PCSM 1270   Note B  
      Ĵ
        7 MB               NA                   
      Ĵ
        8 MB  PCSM 1455   PCSM 1455   Note C  
      Ĵ
      9-16MB  Above Board MC in expansion slot  
      ;

      Configuration Notes:
       *  Standard 1MB memory modules shipped with this system or PCSM
          1170.
       ** Use the standard 1MB module already in that socket or PCSM 1170.
       A  An alternate would be to put an Above Board MC with 2MB in an
          expansion slot, or one PCSM 1270 in each socket.
       B  An alternate would be to put an Above Board MC with 4MB in an
          expansion slot.
       C  An alternate would be to put an Above Board MC with 6MB in an
          expansion slot.

   IBM PS/2 MODEL 55SX-041, 081

      The PS/2 Model 55SX comes standard with 4MB memory (a 4MB module in
      memory socket 1 on the system board). The system is expandable to 8MB
      on the system board and to 16MB by adding an Above Board MC in an
      expansion slot.

      Intel Matched Memory Compatibility:
          Module  Intel Part     IBM Equivalent
           Size     Number         Part Number
           1MB        PCSM 1170           6450603
           2MB        PCSM 1270           6450604
           4MB        PCSM 1455           87F9977 or 34F2933
          8-16MB    Above Board MC

                  PSMB 5300

      ͸
      System  Recommended Upgrade PathAlternate
      Memory ĴUpgrade  
      Desired  Socket 1    Socket 2  Path?    
      Ĵ
        4 MB      *                           
      Ĵ
        5 MB      *       PCSM 1170           
      Ĵ
        6 MB      *       PCSM 1270   Note A  
      Ĵ
        7 MB               NA                   
      Ĵ
        8 MB      *       PCSM 1455   Note B  
      Ĵ
      9-16MB  Above Board MC in expansion slot  
      ;

      Configuration Notes:
       *  Use the standard 4MB memory module or PCSM 1455.
       A  An alternate would be to put an Above Board MC with 2MB.
       B  An alternate would be to put an Above Board MC with 4MB.

   IBM PS/2 MODELS 56SX/LS, SLC, SLC/LS, & 57SX-041, 081

      These PS/2 computers come standard with one 4MB memory module on the
      system board. These system boards have 3 available memory sockets,
      and are expandable to 16MB.

      Intel Matched Memory Compatibility:
            Module    Intel Part     IBM Equivalent
            Size     Number         Part Number
            2MB      PCSM 1290      6450902
            4MB      PCSM 1490      6450128
            8MB      PCSM 1890      6450130

      ͸
      System  Recommended Memory Upgrade Path      Alternate
      Memory ĴUpgrade  
      Desired  Socket 1    Socket 2    Socket 3  Path?    
      Ĵ
        4 MB      *                                       
      Ĵ
        5 MB                   NA                           
      Ĵ
        6 MB      *       PCSM 1290                       
      Ĵ
        7 MB                   NA                           
      Ĵ
        8 MB      *       PCSM 1490               Note A  
      Ĵ
        9 MB                   NA                           
      Ĵ
       10 MB      *       PCSM 1490   PCSM 1290           
      Ĵ
       11 MB                   NA                           
      Ĵ
       12 MB      *       PCSM 1490   PCSM 1490   Note B  
      Ĵ
       13 MB                   NA                           
      Ĵ
       14 MB  PCSM 1890       *       PCSM 1290           
      Ĵ
       15 MB                   NA                            
      Ĵ
       16 MB  PCSM 1890   PCSM 1890               Note C  
      ;

      Configuration Notes:
       *  Use the standard 4MB memory module supplied with the computer or
          PCSM 1490.
       A  An alternate would be to put a PCSM 1290 into sockets 2 and 3 in
          addition to the 4MB memory module in socket 1.
       B  An alternate would be to put a PCSM 1890 into sockets 2 or 3 in
          addition to the 4MB memory module in socket 1.
       C  An alternate would be to put a PCSM 1490 into sockets 2 and 3 in
          addition to the PCSM 1890 in socket 1.

   IBM PS/2 MODEL 70-081, 161

      These PS/2 Model 70 computers come standard with two 2MB memory
      modules on the system board. These system boards have 3 available
      memory sockets, and are expandable to 6MB. These systems are further
      expandable using an Above Board MC.

      Intel Matched Memory Compatibility:
            Module     Intel Part     IBM Equivalent
             Size        Number         Part Number
             1MB       PCSM 1170          6450603
             2MB       PCSM 1270          6450604
                  Above Board MC
                  PSMB 5300

      ͸
      System  Recommended Memory Upgrade Path      Alternate
      Memory ĴUpgrade  
      Desired  Socket 1    Socket 2    Socket 3  Path?    
      Ĵ
        4 MB      *           *                           
      Ĵ
        5 MB      *           *       PCSM 1170           
      Ĵ
        6 MB      *           *       PCSM 1270   Note *  
      Ĵ
       7+ MB   Above Board MC (in an expansion slot)         
      ;

      Configuration Notes:
       *  Use the standard 2MB memory module supplied with the computer or
          PCSM 1270.
       A  An alternate would be to put an Above Board MC with 4MB into an
          expansion slot in addition to the 2MB modules in sockets 1 and 2.



End of file                 Intel FaxBack # 1832          September 28,1992
