
IBM CORPORATION

SL-B, MT2133, MT2155, MT2168

Processor          80486SX/80487SX/ODP486/80486DX/80486DX2
Processor Speed    25/33/50(internal)/66(internal)MHz
Chip Set           Unidentified
Video Chip Set     Unidentified
Maximum Onboard    64MB
Memory
Maximum Video      1MB
Memory
Cache              128/256KB
BIOS               Unidentified
Dimensions         330mm x 218mm
I/O Options        32-bit VESA local bus slot, floppy drive interface, IDE
                   interface, parallel port, PS/2 mouse port, serial ports
                   (2), VESA feature connector, VGA port, riser slot
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  PS/2 mouse port           J2         IDE interface LED     J26/pins 3 &
                                                                  4

  Serial port 1             J3         Speaker                   J27

  Serial port 2             J4         Soft off power            J29
                                       supply

  Parallel port             J5         Soft off power            J30
                                       supply

  VGA port                  J6         Turbo switch              J37

  Floppy drive              J7         Chassis fan power         J38
  interface

  IDE interface             J9         Riser slot                SL1

  VESA feature             J14         32-bit VESA local         SL2
  connector                            bus slot

  Power LED            J26/pins 1 &
                            2

                        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           J50          Unidentified
      alter

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     2MB        (1) 512K x        None           None           None
                    36

     4MB       (1) 1M x 36        None           None           None

     4MB        (1) 512K x     (1) 512K x        None           None
                    36             36

     6MB       (1) 1M x 36     (1) 512K x        None           None
                                   36

     6MB        (1) 512K x     (1) 512K x     (1) 512K x        None
                    36             36             36

     8MB       (1) 2M x 36        None           None           None

     8MB       (1) 1M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     8MB       (1) 1M x 36    (1) 1M x 36        None           None

     8MB        (1) 512K x     (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

     10MB      (1) 2M x 36     (1) 512K x        None           None
                                   36

     10MB      (1) 1M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     12MB      (1) 2M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     12MB      (1) 2M x 36    (1) 1M x 36        None           None

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

     14MB      (1) 2M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

     16MB      (1) 4M x 36        None           None           None

     16MB      (1) 2M x 36    (1) 1M x 36    (1) 1M x 36        None

     16MB      (1) 2M x 36    (1) 2M x 36        None           None

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     18MB      (1) 4M x 36     (1) 512K x        None           None
                                   36

     20MB      (1) 4M x 36     (1) 512K x     (1) 512K x        None
                                   36             36

     20MB      (1) 4M x 36    (1) 1M x 36        None           None

     20MB      (1) 2M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     22MB      (1) 4M x 36     (1) 512K x     (1) 512K x    (1) 512K x 36
                                   36             36

                       DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     24MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36       None

     24MB       (1) 4M x 36   (1) 2M x 36        None          None

     24MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36       None

     28MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     32MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36       None

     32MB       (1) 4M x 36   (1) 4M x 36        None          None

     32MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     36MB       (1) 1M x 36   (1) 4M x 36    (1) 4M x 36       None

     40MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     40MB       (1) 2M x 36   (1) 8M x 36        None          None

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       None

     56MB       (1) 2M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     128KB      (4) 32K x 8        None       (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size       J12       J13       J16       J17       J51

  128KB      2 & 3     1 & 2     2 & 3     1 & 2     1 & 2

  256KB      1 & 2     2 & 3     1 & 2     2 & 3     2 & 3

  Note: Pins designated should be in the closed position.

                  VIDEO MEMORY CONFIGURATION

        Size               Bank 0               Bank 1

       512KB                512KB                None

        1MB                 512KB               512KB

  Note: The size of the video memory chips is unidentified.

                            CPU TYPE SELECTION

       Type               J24                J25               J31

      80486SX          Pins 2 & 3         Pins 2 & 3        Pins 1 & 2
                         closed            closed             closed

      80487SX          Pins 1 & 2         Pins 1 & 2        Pins 2 & 3
                         closed            closed             closed

      ODP486           Pins 1 & 2         Pins 1 & 2        Pins 2 & 3
                         closed            closed             closed

      80486DX          Pins 2 & 3         Pins 1 & 2        Pins 2 & 3
                         closed            closed             closed

     80486DX2          Pins 2 & 3         Pins 1 & 2        Pins 2 & 3
                         closed            closed             closed

