
ATC/UNITRON COMPUTERS & COMPUTER PARTS

U 6921

Processor  umc486/(SL)AM486SX/80486SX/SL80486SX/CXM7/AM486DX/(SL)AM486DX/80486DX/SL80486DX/AM486DX2/(SL)AM486D2/80486DX2/SL80486DX2/
           AM486DX4/(SL)486DX4/80486DX4/SL80486DX4/CXM9/P24D/P24T
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   SIS
Max.       128MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       Award
Dimensions 220mm x 220mm
I/O        32-bit PCI slots (3), green PC connector, IDE interfaces (2)
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External battery            JP1       Turbo LED                 JP38

  IDE interface 2             JP7       Reset switch              JP39

  IDE interface 1             JP8       Turbo switch              JP40

  Speaker                     JP28      Power LED & keylock       JP41

  IDE interface LED           JP32      Green PC LED              LED1

  Green PC connector          JP36      32-bit PCI slots        PC1 - PC3

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP6             Closed

      Monitor type select monochrome          JP6              Open

     Factory configured - do not             JP14             N/A
      alter

     Factory configured - do not             JP15             N/A
      alter

     Flash BIOS EPROM                        JP21             Open

      Flash BIOS voltage select 12v           JP21          Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 5v            JP21          Pins 2 & 3
                                                              closed

      Turbo enabled                           JP40          Pins 2 & 3
                                                              closed

      Turbo disabled                          JP40          Pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        None           None           None
                    36

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

     2MB        (1) 256K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 512K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        None
                    36             36             36

     3MB        (1) 256K x     (1) 512K x        None           None
                    36             36

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

     4MB        (1) 512K x     (1) 256K x     (1) 256K x        None
                    36             36             36

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

     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

     5MB        (1) 512K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     5MB        (1) 256K x     (1) 512K x     (1) 512K x        None
                    36             36             36

     5MB        (1) 256K x    (1) 1M x 36        None           None
                    36

     6MB       (1) 1M x 36     (1) 256K x     (1) 256K x        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

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

     7MB       (1) 1M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     7MB        (1) 256K x     (1) 512K x     (1) 512K x    (1) 512K x 36
                    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

     9MB       (1) 2M x 36     (1) 256K x        None           None
                                   36

     9MB        (1) 256K x    (1) 1M x 36    (1) 1M x 36        None
                    36

     9MB        (1) 256K x    (1) 2M x 36        None           None
                    36

     10MB      (1) 2M x 36     (1) 256K x     (1) 256K x        None
                                   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

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

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

     11MB      (1) 2M x 36     (1) 256K x     (1) 256K x    (1) 256K 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

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

     13MB       (1) 256K x    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36
                    36

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

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

     17MB      (1) 4M x 36     (1) 256K x        None           None
                                   36

     17MB       (1) 256K x    (1) 2M x 36    (1) 2M x 36        None
                    36

     17MB       (1) 256K x    (1) 4M x 36        None           None
                    36

     18MB      (1) 4M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

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

     18MB       (1) 512K x    (1) 2M x 36    (1) 2M x 36        None
                    36

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

     20MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

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

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

     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

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

     25MB       (1) 256K x    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36
                    36

     26MB       (1) 512K x    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36
                    36

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

     28MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     32MB      (1) 8M x 36        None           None           None

     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

     33MB      (1) 8M x 36     (1) 256K x        None           None
                                   36

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

     33MB       (1) 256K x    (1) 8M x 36        None           None
                    36

     34MB      (1) 8M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     34MB       (1) 8M x 36     (1) 512K x       None           None
                                   36

     34MB        (1) 512K x    (1) 4M x 36    (1) 4M x 36       None
                     36

     34MB        (1) 512K x    (1) 8M x 36       None           None
                     36

     35MB       (1) 8M x 36     (1) 256K x     (1) 256K x   (1) 256K x 36
                                   36             36

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

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

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

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

     38MB       (1) 8M x 36     (1) 512K x     (1) 512K x   (1) 512K x 36
                                   36             36

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

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

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

     40MB       (1) 2M x 36    (1) 4M x 36    (1) 4M x 36       None

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

     44MB       (1) 8M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     48MB       (1) 8M x 36    (1) 2M x 36    (1) 2M x 36       None

     48MB       (1) 8M x 36    (1) 4M x 36       None           None

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

     48MB       (1) 4M x 36    (1) 8M x 36       None           None

     49MB        (1) 256K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

     50MB        (1) 512K x    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36
                     36

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

     56MB       (1) 8M x 36    (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

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

     64MB       (1) 8M x 36    (1) 4M x 36    (1) 4M x 36       None

     64MB       (1) 8M x 36    (1) 8M x 36       None           None

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

     65MB        (1) 256K x    (1) 8M x 36    (1) 8M x 36       None
                     36

     66MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36       None
                     36

     68MB       (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       None

     72MB       (1) 2M x 36    (1) 8M x 36    (1) 8M x 36       None

     80MB       (1) 8M x 36    (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     80MB       (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       None

     96MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       None

     97MB        (1) 256K x    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36
                     36

     98MB        (1) 512K x    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36
                     36

    100MB       (1) 1M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    104MB       (1) 2M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    112MB       (1) 4M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

              CACHE CONFIGURATION

      Size          Bank 0           TAG

     128KB        (4) 32K x 8     (1) 8K x 8

     256KB        (4) 64K x 8    (1) 32K x 8

     512KB        (4) 128K x 8   (1) 32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP9                  JP10

        128KB          Pins 1 & 2 closed   Pins 1 & 2 closed

        256KB          Pins 2 & 3 closed   Pins 1 & 2 closed

        512KB          Pins 2 & 3 closed   Pins 2 & 3 closed

                          CPU TYPE CONFIGURATION

        Type           JP11       JP12       JP17       JP18       JP19

       UMC486          2 & 3      Open       Open       Open       Open

    (SL)AM486SX        2 & 3      2 & 3      Open      2 & 3      1 & 2

      804846SX         Open       2 & 3      Open       Open       Open

     SL804846SX        Open       2 & 3      Open       Open       Open

        CXM7           2 & 3      2 & 3      Open       Open       Open

      AM486DX          2 & 3      2 & 3      Open       Open      1 & 2

    (SL)AM486DX        2 & 3      2 & 3      Open      2 & 3      1 & 2

      80486DX          2 & 3      2 & 3      Open       Open      1 & 2

     SL80486DX         2 & 3      2 & 3      Open       Open       Open

      AM486DX2         2 & 3      2 & 3      Open       Open      2 & 3

    (SL)AM486DX2       2 & 3      2 & 3      Open      2 & 3      1 & 2

      80486DX2         2 & 3      2 & 3      Open       Open       Open

     SL80486DX2        2 & 3      2 & 3      Open       Open       Open

      AM486DX4         2 & 3      2 & 3      Open       Open      1 & 2

    (SL)AM486DX4       2 & 3      2 & 3      Open      2 & 3      1 & 2

   80486DX4 (2x)       2 & 3      2 & 3      Open       Open      1 & 2

  SL80486DX4 (2x)      2 & 3      2 & 3      Open       Open       Open

  80486DX4 (2.5x)      2 & 3      2 & 3      Open       Open      1 & 2

  SL80486DX4 (2.5x)    2 & 3      2 & 3      Open       Open       Open

   80486DX4 (3x)       2 & 3      2 & 3      Open       Open      1 & 2

  SL80486DX4 (3x)      2 & 3      2 & 3      Open       Open       Open

     CXM9 (2x)         2 & 3      1 & 2      Open      1 & 2       Open

     CXM9 (3x)         2 & 3      1 & 2      Open      1 & 2       Open

     P24D (WB)         2 & 3      1 & 2      Open      1 & 2      1 & 2

     P24D (WT)         2 & 3      1 & 2      Open      1 & 2      2 & 3

     P24T (WB)         1 & 2      1 & 2     2 & 3       Open       Open

     P24T (WT)         1 & 2      1 & 2     1 & 2       Open       Open

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

        Type           JP20       JP22        JP23      JP24       JP25

       UMC486          Open       Open        Open      Open       Open

    (SL)AM486SX       2 & 3      Closed       Open      4 & 5     4 & 5

      804846SX         Open       Open        Open      Open       Open

     SL804846SX       2 & 3      Closed       Open      1 & 2     4 & 5

        CXM7          1 & 2      Closed       Open      Open      2 & 3

      AM486DX          Open       Open        Open      Open      4 & 5

    (SL)AM486DX       2 & 3      Closed       Open      4 & 5     4 & 5

      80486DX          Open       Open        Open      Open      4 & 5

     SL80486DX        2 & 3      Closed       Open      1 & 2     4 & 5

      AM486DX2         Open       Open        Open      Open      4 & 5

    (SL)AM486DX2      2 & 3      Closed       Open      4 & 5     4 & 5

      80486DX2        2 & 3      Closed       Open      1 & 2     4 & 5

     SL80486DX2       2 & 3      Closed       Open      1 & 2     4 & 5

      AM486DX4         Open       Open        Open      Open      4 & 5

    (SL)AM486DX4      2 & 3      Closed       Open      4 & 5     4 & 5

   80486DX4 (2x)       Open       Open        Open      Open      4 & 5

  SL80486DX4 (2x)     2 & 3      Closed       Open      1 & 2     4 & 5

  80486DX4 (2.5x)      Open       Open        Open      Open      4 & 5

     SL80486DX4       2 & 3      Closed       Open      1 & 2     4 & 5
       (2.5x)

   80486DX4 (3x)       Open       Open        Open      Open      4 & 5

  SL80486DX4 (3x)     2 & 3      Closed       Open      1 & 2     4 & 5

     CXM9 (2x)         Open      Closed       Open      2 & 3     2 & 3

     CXM9 (3x)         Open      Closed       Open      2 & 3     2 & 3

     P24D (WB)        2 & 3      Closed       Open      2 & 3     4 & 5

     P24D (WT)        2 & 3      Closed       Open      2 & 3     4 & 5

     P24T (WB)        2 & 3      Closed       Open      Open      1 & 2

     P24T (WT)        2 & 3      Closed       Open      Open      1 & 2

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

        Type           JP26       JP27       JP29      JP33        JP34

       UMC486          2 & 3      Open       Open      Open        Open

    (SL)AM486SX        2 & 3     3 & 4       Open      Open       1 & 2

      804846SX         2 & 3      Open       Open      Open        Open

     SL804846SX        2 & 3     3 & 4       Open      Open        Open

        CXM7          1 & 2, 3   2 & 3       Open      2 & 3      2 & 3
                        & 4

      AM486DX         1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

    (SL)AM486DX       1 & 2, 3   3 & 4       Open      Open       1 & 2
                        & 4

      80486DX         1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

     SL80486DX        1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

      AM486DX2        1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

    (SL)AM486DX2      1 & 2, 3   3 & 4       Open      Open       1 & 2
                        & 4

      80486DX2        1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

     SL80486DX2       1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

      AM486DX4        1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

    (SL)AM486DX4      1 & 2, 3   3 & 4       Open      Open       1 & 2
                        & 4

   80486DX4 (2x)      1 & 2, 3   3 & 4      2 & 3      Open        Open
                        & 4

  SL80486DX4 (2x)     1 & 2, 3   3 & 4      2 & 3      Open        Open
                        & 4

  80486DX4 (2.5x)     1 & 2, 3   3 & 4      1 & 2      Open        Open
                        & 4

  SL80486DX4 (2.5x)   1 & 2, 3   3 & 4      1 & 2      Open        Open
                        & 4

   80486DX4 (3x)      1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

  SL80486DX4 (3x)     1 & 2, 3   3 & 4       Open      Open        Open
                        & 4

     CXM9 (2x)        1 & 2, 3  1 & 2, 3    2 & 3      Open       1 & 2
                        & 4       & 4

     CXM9 (3x)        1 & 2, 3  1 & 2, 3     Open      Open       1 & 2
                        & 4       & 4

     P24D (WB)        1 & 2, 3  1 & 2, 3     Open      Open       1 & 2
                        & 4       & 4

     P24D (WT)        1 & 2, 3  1 & 2, 3     Open      Open       1 & 2
                        & 4       & 4

     P24T (WB)        1 & 2, 3   3 & 4       Open      1 & 2      1 & 2
                        & 4

     P24T (WT)        1 & 2, 3   3 & 4       Open      1 & 2      1 & 2
                        & 4

  Note: Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

          Speed                    JP13                     JP16

          25MHz             Pins 1 & 2 closed               Open

          33MHz             Pins 1 & 2 closed         Pins 1 & 2, 3 & 4
                                                           closed

          40MHz             Pins 2 & 3 closed        Pins 1 & 2 closed

         50iMHz             Pins 1 & 2 closed               Open

          50MHz             Pins 2 & 3 closed        Pins 3 & 4 closed

         66iMHz             Pins 1 & 2 closed         Pins 1 & 2, 3 & 4
                                                           closed

         75iMHz             Pins 1 & 2 closed               Open

         100iMHz            Pins 1 & 2 closed         Pins 1 & 2, 3 & 4
                                                           closed

                         CPU VOLTAGE CONFIGURATION

     Voltage             JP30               JP31               JP35

       3.3v           Pins 2 & 3         Pins 5 & 6         Pins 2 & 3
                        closed             closed             closed

      3.45v           Pins 2 & 3         Pins 3 & 4         Pins 2 & 3
                        closed             closed             closed

        4v            Pins 2 & 3         Pins 1 & 2         Pins 2 & 3
                        closed             closed             closed

        5v            Pins 1 & 2        Any setting         Pins 1 & 2
                        closed                                closed

                            BIOS CONFIGURATION

          Setting                    JP2                     JP3

     CMOS memory normal       Pins 1 & 2 closed       Pins 1 & 2 closed
         operation

     CMOS memory clear        Pins 2 & 3 closed       Pins 2 & 3 closed

                 GREEN PC CONFIGURATION

          Setting                      JP37

         Doze mode               Pins 1 & 2 closed

        Suspend mode             Pins 3 & 4 closed

        Standby mode         Pins 5 & 6, 7 & 8 closed

