UNISYS CORPORATION

OPEN SYSTEMS CWP

Device Type      Mainboard
Processor        80486SX2/80486DX/80486DX2/80486DX4
Processor Speed  33/50(internal)/66(internal)/100(internal)MHz
Chip Set         Unidentified
Video Chip Set   Cirrus Logic
Maximum Onboard  64MB
Memory
Maximum Video    2MB
Memory
Cache            256KB
BIOS             Unidentified
Dimensions       254mm x 218mm
I/O Options      Ethernet connector, floppy drive interface, IDE interface,
                 parallel port, PS/2 mouse port, serial ports (2), VGA
                 feature connector, VGA port, riser slot, cache slot
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  LED, speaker                C1       VGA feature connector       CN7

  3.3v power                  C2       IDE interface 1             CN8

  VGA port                    CN1      Floppy drive interface      CN9

  Ethernet connector          CN2      Smart port connector       CN10

  PS/2 mouse port             CN3      BNC connector              CN11

  Parallel port               CN4      Riser slot                  SL1

  Serial port 1               CN5      Cache slot                  SL2

  Serial port 2               CN6

                SIMM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB        (1) 256K x 36         None

       2MB        (1) 512K x 36         None

       2MB        (1) 256K x 36    (1) 256K x 36

       4MB         (1) 1M x 36          None

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

       5MB         (1) 1M x 36     (1) 256K x 36

       6MB         (1) 1M x 36     (1) 512K x 36

       8MB         (1) 2M x 36          None

       8MB         (1) 1M x 36      (1) 1M x 36

       9MB         (1) 2M x 36     (1) 256K x 36

      10MB         (1) 2M x 36     (1) 512K x 36

      12MB         (1) 2M x 36      (1) 1M x 36

      16MB         (1) 4M x 36          None

      16MB         (1) 2M x 36      (1) 2M x 36

      17MB         (1) 4M x 36     (1) 256K x 36

      18MB         (1) 4M x 36     (1) 512K x 36

      20MB         (1) 4M x 36      (1) 1M x 36

      24MB         (1) 4M x 36      (1) 2M x 36

      32MB         (1) 8M x 36          None

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

      33MB         (1) 8M x 36     (1) 256K x 36

      34MB         (1) 8M x 36     (1) 512K x 36

      36MB         (1) 8M x 36      (1) 1M x 36

      40MB         (1) 8M x 36      (1) 2M x 36

      48MB         (1) 8M x 36      (1) 4M x 36

      64MB         (1) 8M x 36      (1) 8M x 36

                CACHE CONFIGURATION

           Size                      SL2

          256KB            256KB module installed

            VIDEO MEMORY CONFIGURATION

      Size            Bank 0           Bank 1

       1MB             1MB              None

       2MB             1MB         (2) 256K x 16

                            CPU TYPE SELECTION

      Type           J22            J23            J25           J26

  80486SX2-33       1 & 2          1 & 3        1 & 3, 2 &   1 & 3, 2 & 4
                                                    4

  80486DX2-50       1 & 2          2 & 4        1 & 3, 2 &   1 & 3, 2 & 4
                                                    4

  80486DX2-66       1 & 2          1 & 3        1 & 3, 2 &   1 & 3, 2 & 4
                                                    4

  80486DX4-100      1 & 2          1 & 3        3 & 5, 4 &   3 & 5, 4 & 6
                                                    6

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CON’T)

      Type           J27            J29           J31            J32

  80486SX2-33       1 & 2          Open          1 & 2           Open

  80486DX2-50       1 & 2          Open          1 & 2           Open

  80486DX2-66       1 & 2          Open          1 & 2           Open

  80486DX4-100      2 & 3          Open          1 & 2           Open

  Note: Pins designated should be in the closed position.