IBM CORPORATION
===============

   PS/1 TYPE 2133A, 2155A, 2168A (TYPE 1)

   Device Type      Mainboard                                     
   Processor        80486SX/80487SX/80486DX/80486DX2/P24T         
   Processor Speed  25/33/50(internal)/66(internal)MHz            
   Chip Set         Unidentified                                  
   Video Chip Set   Unidentified                                  
   Maximum Onboard  64MB                                          
   Memory           
   Maximum Video    Unidentified                                  
   Memory           
   Cache            128/256KB                                     
   BIOS             Unidentified                                  
   Dimensions       330mm x 218mm                                 
   I/O Options      Floppy drive interface, IDE interface,        
                    parallel port, PS/2 mouse port, serial ports  
                    (2), VGA feature connector, VGA port, riser   
                    slot                                          
   NPU Options      None                                          

<gopher://bitreich.org/I/th99/m/I-L/34755-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose              | Location | Purpose       | Location |
   |----------------------+----------+---------------+----------|
   | PS/2 mouse port      |    J2    | VGA feature   |   J14    |
   |                      |          | connector     |          |
   |----------------------+----------+---------------+----------|
   | Serial port 1        |    J3    | IDE interface |   J26    |
   |                      |          | LED           |          |
   |----------------------+----------+---------------+----------|
   | Serial port 2        |    J4    | Speaker       |   J27    |
   |----------------------+----------+---------------+----------|
   | Parallel port        |    J5    | Power supply  |   J29    |
   |                      |          | connector     |          |
   |----------------------+----------+---------------+----------|
   | VGA port             |    J6    | Power supply  |   J30    |
   |                      |          | connector     |          |
   |----------------------+----------+---------------+----------|
   | Floppy drive         |    J7    | Riser slot    |   SL1    |
   | interface            |          |               |          |
   |----------------------+----------+---------------+----------|
   | IDE interface        |    J9    |               |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | On board video disabled         |  J15  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | On board video enabled          |  J15  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | SP103 | Unidentified |
   |   | alter (password bypass)         |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  U53  | Unidentified |
   |   | alter                           |       |              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (1) 256K x  |    None     |    None    |    None    |
   |      |     36      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (1) 256K x  | (1) 256K x  |    None    |    None    |
   |      |     36      |     36      |            |            |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (1) 256K x  | (1) 256K x  | (1) 256K x |    None    |
   |      |     36      |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 256K x  | (1) 256K x  | (1) 256K x | (1) 256K x |
   |      |     36      |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (1) 1M x 36 | (1) 256K x  |    None    |    None    |
   |      |             |     36      |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (1) 1M x 36 | (1) 256K x  | (1) 256K x |    None    |
   |      |             |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 7MB  | (1) 1M x 36 | (1) 256K x  | (1) 256K x | (1) 256K x |
   |      |             |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 17MB | (1) 4M x 36 | (1) 256K x  |    None    |    None    |
   |      |             |     36      |            |            |
   |------+-------------+-------------+------------+------------|
   | 19MB | (1) 4M x 36 | (1) 256K x  | (1) 256K x | (1) 256K x |
   |      |             |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 20MB | (1) 4M x 36 | (1) 1M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 4M x 36 | (1) 2M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 28MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 33MB | (1) 256K x  | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |     36      |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 52MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |      TAG      |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     None      |  (1) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |       Size       |        J16         |        J17         |
   |------------------+--------------------+--------------------|
   |      128KB       | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |      256KB       | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 VIDEO MEMORY CONFIGURATION                 |
   |------------------------------------------------------------|
   | Note: The size and location of the video memory is         |
   | unidentified.                                              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |           CPU TYPE SELECTION (SX SYSTEM BOARDS)            |
   |------------------------------------------------------------|
   |     Type      |     J23      |     J24      |     J25      |
   |---------------+--------------+--------------+--------------|
   |    80486SX    |  Pins 1 & 2  |  Pins 1 & 2  |  Pins 1 & 2  |
   |               |    closed    |    closed    |    closed    |
   |---------------+--------------+--------------+--------------|
   | 486SX/80487SX |  Pins 1 & 2  |  Pins 1 & 2  |  Pins 2 & 3  |
   |               |    closed    |    closed    |    closed    |
   |---------------+--------------+--------------+--------------|
   | 486SX/ODP486  |  Pins 1 & 2  |  Pins 1 & 2  |  Pins 2 & 3  |
   |               |    closed    |    closed    |    closed    |
   |---------------+--------------+--------------+--------------|
   | 486SX/Pentium |  Pins 1 & 2  |  Pins 1 & 2  |  Pins 2 & 3  |
   |      ODP      |    closed    |    closed    |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |         CPU TYPE SELECTION (DX, DX2 SYSTEM BOARDS)         |
   |------------------------------------------------------------|
   |    Type     |      J23      |      J24      |     J25      |
   |-------------+---------------+---------------+--------------|
   |   80486DX   |  Pins 1 & 2   |  Pins 1 & 2   |  Pins 1 & 2  |
   |             |    closed     |    closed     |    closed    |
   |-------------+---------------+---------------+--------------|
   |  80486DX2   |  Pins 1 & 2   |  Pins 1 & 2   |  Pins 1 & 2  |
   |             |    closed     |    closed     |    closed    |
   |-------------+---------------+---------------+--------------|
   | Pentium ODP |  Pins 1 & 2   |  Pins 1 & 2   |  Pins 2 & 3  |
   |             |    closed     |    closed     |    closed    |
   +------------------------------------------------------------+