
IBM CORPORATION

PS/1 TYPE 2133, 2155, 2168 (TYPE B1)

Device Type        Mainboard
Processor          80486SX/80487SX/80486DX/80486DX2/ODP486
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        32-bit VESA local bus slot, floppy drive interface, IDE
                   interface, parallel port, PS/2 mouse port, serial ports
                   (2), VGA feature connector, VGA port, riser slot
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse port             J2       IDE interface LED          J26

  Serial port 1               J3       Speaker                    J27

  Serial port 2               J4       Power supply               J29
                                       connector

  Parallel port               J5       Power supply               J30
                                       connector

  VGA port                    J6       Chassis fan power          J38

  Floppy drive                J7       Riser slot                 SL1
  interface

  IDE interface               J9       32-bit VESA local bus      SL2
                                       slot

  VGA feature connector      J14

                        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           J37          Unidentified
      alter

     Factory configured - do not           J50          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 36        None

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

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

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

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

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

     33MB       (1) 256K x    (1) 4M x 36    (1) 4M x 36        None
                    36

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

     52MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36     (1) 1M 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) 32K 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

  Note: The size of the video memory 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

      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

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

