
ATC/UNITRON COMPUTER & COMPUTER PARTS

486AL

Processor  CX486M6/CX486M7/AM486SXL/AM486SX(PLUS)/80486SX/AM486DXL/ 80486DX/
           80486DX2/AM486DX4(PLUS)/80486DX4/P23S/P24D/Pentium Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/100(internal)/
Speed      120(internal)MHz
Chip Set   SIS
Max.       128MB
Onboard
DRAM
Cache      128/256/512/1024KB
BIOS       AMI/Award
Dimensions 280mm x 220mm
I/O        32-bit VESA local bus slot, floppy drive interface, green PC connector, IDE
Options    interface, parallel port, serial ports (2), VGA feature connector, VGA port,
           riser slot
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  VGA port                  CN1        Green PC connector       JP51

  Parallel port             CN2        Green PC connector       JP59

  Serial port 2             CN3        Turbo LED            JP61 pins 1 &
                                                                  2

  Serial port 1             CN4        Turbo switch         JP61 pins 3 &
                                                                  4

  VGA feature               CN5        Reset switch             JP62
  connector

  IDE interface             CN6        Speaker                  JP63

  Floppy drive              CN7        Power LED &              JP64
  interface                            keylock

  Power LED                 J1         Riser Card                SL1

  External battery         JP16        32-bit VESA local         SL2
                                       bus slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      PS/2 mouse enabled                      JP3             Closed

      PS/2 mouse disabled                     JP3              Open

     VGA BIOS enabled                        JP7           pins 1 & 2
                                                              closed

      VGA BIOS disabled                       JP7           pins 2 & 3
                                                              closed

     Factory configured - do not             JP8              N/A
      alter

      Monitor type select color               JP9             Closed

      Monitor type select monochrome          JP9              Open

     CMOS memory normal operation            JP11          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP11          pins 2 & 3
                                                              closed

     ECP DRQ enabled                         JP12          pins 1 & 2
                                                              closed

      ECP DRQ disabled                        JP12          pins 2 & 3
                                                              closed

     ECP A10 enabled                         JP15          pins 1 & 2
                                                              closed

      ECP A10 disabled                        JP15          pins 2 & 3
                                                              closed

     Parallel port IRQ select IRQ7           JP17          pins 2 & 3
                                                              closed

      Parallel port IRQ select IRQ5           JP17          pins 1 & 2
                                                              closed

     Serial port IRQ select IRQ4             JP18          pins 3 & 4
                                                              closed

      Serial port IRQ select IRQ3             JP18          pins 1 & 2
                                                              closed

     Factory configured - do not             JP24             N/A
      alter

      CPU voltage regulator type              JP25          pins 1 & 2
      select LT1085                                           closed

      CPU voltage regulator type              JP25          pins 2 & 3
      select LT1085-3.3                                       closed

      CPU voltage regulator type              JP27            Closed
      select auto

      CPU voltage regulator type              JP27             Open
      select manual

     IDE interface enabled                   JP32             Open

      IDE interface disabled                  JP32            Closed

     CPU clock = CLKIN                       JP47          pins 1 & 2
                                                              closed

      CPU clock delayed for CLKIN             JP47          pins 2 & 3
                                                              closed

     Internal clock select CLKIN             JP50          pins 1 & 2
                                                              closed

      Internal clock select 1/2 CLKIN         JP50          pins 2 & 3
                                                              closed

                       DRAM CONFIGURATION 1

      Size            Bank 0           Bank 1          Bank 2

       1MB         (4) 256K x 9         NONE            NONE

       2MB         (4) 256K x 9    (1) 256K x 36        NONE

       4MB          (4) 1M x 9          NONE            NONE

       5MB         (4) 256K x 9     (1) 1M x 36         NONE

       6MB         (4) 256K x 9    (1) 256K x 36     (1) 1M x 36

       8MB          (4) 1M x 9      (1) 1M x 36         NONE

      12MB          (4) 1M x 9      (1) 1M x 36      (1) 1M x 36

      16MB          (4) 4M x 9          NONE            NONE

      17MB         (4) 256K x 9     (1) 4M x 36         NONE

      18MB         (4) 256K x 9    (1) 256K x 36     (1) 4M x 36

      20MB          (4) 1M x 9      (1) 4M x 36         NONE

      24MB          (4) 1M x 9      (1) 1M x 36      (1) 4M x 36

      32MB          (4) 4M x 9      (1) 4M x 36         NONE

      36MB          (4) 1M x 9      (1) 4M x 36      (1) 4M x 36

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

      64MB         (4) 16M x 9          NONE            NONE

      65MB         (4) 256K x 9     (1) 16M x 36        NONE

      68MB          (4) 1M x 9      (1) 16M x 36        NONE

      72MB          (4) 1M x 9      (1) 1M x 36     (1) 16M x 36

      80MB          (4) 4M x 9      (1) 16M x 36        NONE

      96MB          (4) 4M x 9      (1) 4M x 36     (1) 16M x 36

      128MB        (4) 16M x 9      (1) 16M x 36        NONE

                       DRAM CONFIGURATION 2

      Size            Bank 0           Bank 1          Bank 2

       1MB             NONE        (1) 256K x 36        NONE

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

       4MB             NONE         (1) 1M x 36         NONE

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

       6MB          (4) 1M x 9     (1) 256K x 36    (1) 256K x 36

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

      12MB          (4) 1M x 9      (1) 1M x 36      (1) 1M x 36

      16MB             NONE         (1) 4M x 36         NONE

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

      18MB          (4) 4M x 9     (1) 256K x 36    (1) 256K x 36

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

      24MB          (4) 4M x 9      (1) 1M x 36      (1) 1M x 36

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

      32MB             NONE         (1) 8M x 36         NONE

      36MB          (4) 4M x 9      (1) 1M x 36      (1) 4M x 36

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

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

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

                   DRAM CONFIGURATION 2 (CON'T)

      Size            Bank 0           Bank 1          Bank 2

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

      64MB             NONE         (1) 16M x 36        NONE

      65MB             NONE        (1) 256K x 36    (1) 16M x 36

      68MB             NONE         (1) 1M x 36     (1) 16M x 36

      72MB         (4) 16M x 9       (4) 1M x 9      (4) 1M x 9

      80MB             NONE          (4) 4M x 9      (4) 16M x 9

      96MB         (4) 16M x 9       (4) 4M x 9      (4) 4M x 9

      128MB            NONE         (4) 16M x 9      (4) 16M x 9

                         DRAM JUMPER CONFIGURATION

    Configuration          JP54              JP55              JP56

          1              pins 1 & 2        pins 1 & 2        pins 1 & 2
                          closed            closed            closed

          2              pins 2 & 3        pins 2 & 3        pins 2 & 3
                          closed            closed            closed

                        CACHE CONFIGURATION

      Size            Bank 0           Bank 1            TAG

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

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

    256KB (B)      (4) 64K x 8          NONE         (1) 32K x 8

    512KB (A)      (4) 64K x 8      (4) 64K x 8      (1) 32K x 8

    512KB (B)      (4) 128K x 8         NONE         (1) 32K x 8

       1MB         (4) 128K x 8     (4) 128K x 8     (1) 64K x 8

  Note: The orientation of Banks 0 & 1 and TAG are unidentified.

                        CACHE JUMPER CONFIGURATION

   Size      JP33     JP34       JP35         JP36        JP52     JP53

  128KB     1 & 2    1 & 2        Any          Any       1 & 2     1 & 2
                                setting      setting

   256KB    2 & 3    2 & 3        Any          Any       1 & 2     2 & 3
   (A)                          setting      setting

   256KB    1 & 2    1 & 2       1 & 2        1 & 2      1 & 2     2 & 3
   (B)

   512KB    2 & 3    2 & 3       2 & 3        2 & 3      2 & 3     2 & 3
   (A)

   512KB    1 & 2    1 & 2       1 & 2        1 & 2      2 & 3     2 & 3
   (B)

   1MB      2 & 3    2 & 3       2 & 3        1 & 2      2 & 3     2 & 3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type          JP19       JP20        JP21       JP22       JP23

     CX486M6          N/A       2 & 3      1 & 2      2 & 3        N/A

     AM486SXL        1 & 2       N/A       2 & 3      2 & 3        N/A

  AM486SX(PLUS)      4 & 5       N/A       1 & 2      2 & 3       2 & 3

     80486SX         1 & 2       N/A       1 & 2      2 & 3        N/A

     AM486DXL        1 & 2       N/A       2 & 3      2 & 3        N/A

     CX486M7          N/A       2 & 3      1 & 2      2 & 3        N/A

     80486DX         1 & 2       N/A       1 & 2      2 & 3        N/A

     80486DX2        1 & 2       N/A       1 & 2      2 & 3        N/A

  AM486DX4(PLUS)     4 & 5       N/A       1 & 2      2 & 3       2 & 3

     80486DX4        1 & 2       N/A       1 & 2      2 & 3        N/A

       P23S          1 & 2       N/A       1 & 2      2 & 3        N/A

       P24D          2 & 3      1 & 2      1 & 2      1 & 2       1 & 2

       P24T          1 & 2      1 & 2      1 & 2      1 & 2        N/A

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CON'T)

       Type           JP38       JP39       JP40       JP41        JP42

      CX486M6        2 & 3       2 & 3       N/A       1 & 2      2 & 3

     AM486SXL         N/A        3 & 4      1 & 2      3 & 4      2 & 3

   AM486SX(PLUS)     4 & 5        N/A        N/A       2 & 3      2 & 3

      80486SX        4 & 5        N/A        N/A       2 & 3      2 & 3

     AM486DXL         N/A        3 & 4     1 & 2, 3    3 & 4     1 & 2, 3
                                             & 4                   & 4

      CX486M7        2 & 3       2 & 3      3 & 4      1 & 2     1 & 2, 3
                                                                   & 4

      80486DX        4 & 5        N/A       3 & 4      2 & 3     1 & 2, 3
                                                                   & 4

     80486DX2        4 & 5        N/A       3 & 4      2 & 3     1 & 2, 3
                                                                   & 4

  AM486DX4(PLUS)     4 & 5        N/A       3 & 4      2 & 3     1 & 2, 3
                                                                   & 4

     80486DX4        4 & 5        N/A       3 & 4      2 & 3     1 & 2, 3
                                                                   & 4

       P23S          4 & 5        N/A       3 & 4      2 & 3      2 & 3

       P24D          4 & 5        N/A       3 & 4      2 & 3     1 & 2, 3
                                                                   & 4

       P24T          1 & 2       1 & 2      2 & 3      2 & 3     1 & 2, 3
                                                                   & 4

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CON'T)

        Type           JP43     JP44     JP45     JP46     JP48     JP49

      CX486M6          N/A      N/A     2 & 3      N/A      N/A     N/A

      AM486SXL         N/A      N/A     4 & 5      N/A      N/A     N/A

   AM486SX(PLUS)       N/A      N/A     3 & 4      N/A      N/A     N/A

      80486SX          N/A      N/A     3 & 4      N/A     2 & 3   1 & 2

      AM486DXL         N/A      N/A     4 & 5      N/A     1 & 2   2 & 3

      CX486M7          N/A      N/A     2 & 3      N/A     1 & 2   2 & 3

      80486DX         2 & 3     N/A     3 & 4      N/A     2 & 3   1 & 2

      80486DX2        2 & 3     N/A     3 & 4      N/A     2 & 3   1 & 2

   AM486DX4(PLUS)     2 & 3     N/A     3 & 4      N/A     1 & 2   1 & 2

      80486DX4        1 & 2     N/A     3 & 4      N/A     2 & 3   1 & 2

        P23S           N/A      N/A     3 & 4      N/A      N/A     N/A

        P24D          1 & 2,    N/A     1 & 2,     N/A     1 & 2   1 & 2
                      or 2 &            3 & 4
                        3

        P24T           N/A      N/A     3 & 4     1 & 2,   1 & 2   1 & 2
                                                  or 2 &
                                                    3

  Note: Pins designated should be in the closed position. This board also
  accepts SL-series CPUs & am486dxl2, but no jumper settings are listed.

                CPU SPEED CONFIGURATION

           Speed                       JP37

           25MHz             pins 1 & 2, 5 & 6 closed

           33MHz             pins 1 & 2, 3 & 4 closed

           40MHz                 pins 5 & 6 closed

           50iMHz            pins 1 & 2, 5 & 6 closed

           50MHz                 pins 3 & 4 closed

           66iMHz            pins 1 & 2, 3 & 4 closed

           75iMHz            pins 1 & 2, 5 & 6 closed

           80iMHz                pins 5 & 6 closed

          100iMHz            pins 1 & 2, 3 & 4 closed

          120iMHz                pins 5 & 6 closed

        CPU VOLTAGE CONFIGURATION

       Voltage               JP26

     Auto detect             Open

        3.3v          pins 2 & 3 closed

         5v           pins 1 & 2 closed

                      VL BUS WAIT STATE CONFIGURATION

              Wait states                              JP58

               0 wait states                    pins 1 & 2 closed

               1 wait state                     pins 2 & 3 closed

                        VL BUS SPEED CONFIGURATION

               CPU speed                               JP57

                 <= 33MHz                      pins 1 & 2 closed

                  > 33MHz                      pins 2 & 3 closed

                             DMA CONFIGURATION

           DMA                      JP13                    JP14

           DMA 1            pins 2 & 3 closed        pins 2 & 3 closed

           DMA 3            pins 1 & 2 closed        pins 1 & 2 closed

                    FLOPPY ENHANCED MODE CONFIGURATION

           Setting                     JP28                  JP29

            Enabled                  Closed                Closed

            Disabled                  Open                  Open

                          KEYBOARD CONFIGURATION

    Type          JP1            JP2            JP5              JP6

     AT           Open           Open        pins 2 & 3       pins 2 & 3
                                               closed          closed

    PS/2         Closed         Closed       pins 1 & 2       pins 1 & 2
                                               closed          closed

                        MEDIA DETECT CONFIGURATION

           Setting                     JP30                  JP31

            Enabled                  Closed                Closed

            Disabled                  Open                  Open

          MISCELLANEOUS TECHNICAL NOTE

  Note: The location of pin 1 is unidentified.

