
AT & T

MODEL 6386SX/EL20 (FM-0589-09)

Processor                  80386SX (exact location unidentified)
Processor Speed            20MHz
Chip Set                   Unidentified
Video Chip Set             None
Maximum Onboard Memory     32MB
Maximum Video Memory       None
Cache                      16/32/64KB
BIOS                       Unidentified
Dimensions                 330mm x 218mm
I/O Options                Floppy drive interface, IDE interface, parallel
                           port, PS/2 mouse port, serial ports (2), VGA
                           feature connector, VGA port, riser slot
NPU Options                80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  VGA feature connector       CN1      VGA port                    CN6

  PS/2 mouse port             CN2      Floppy drive interface      CN7

  Serial port                 CN3      IDE interface               CN8

  Serial port                 CN4      Riser slot                  SL1

  Parallel port               CN5

                        USER CONFIGURABLE SETTINGS

                 Function                      Label         Position

     16-bit video BIOS enabled                SW1/3            Off

      8-bit video BIOS enabled                 SW1/3            On

     16-bit video buffer enabled              SW1/4            Off

      8-bit video buffer enabled               SW1/4            On

     1024 x 768 interlaced enabled            SW1/5            On

      1024 x 768 non interlaced enabled        SW1/5            Off

     On board video enabled                   SW1/8            On

      On board video disabled                  SW1/8            Off

     Password normal operation                 W1           Pins 1 & 2
                                                              closed

      Password clear                            W1           Pins 2 & 3
                                                              closed

     Factory configured - do not alter         W2             Open

     Monitor type select color                 W3            Closed

      Monitor type select monochrome            W3             Open

     Parallel port unidirectional              W4            Closed

      Parallel port bidirectional               W4             Open

     PS/2 mouse IRQ12 enabled                  W5            Closed

      PS/2 mouse IRQ12 disabled                 W5             Open

     Non volatile RAM normal operation         W7             Open

      Non volatile RAM clear                    W7            Closed

     Speaker type select onboard               W10          Pins 1 & 2
                                                              closed

      Speaker type select offboard              W10          Pins 2 & 3
                                                              closed

     IDE interface LED enabled                 W11          Pins 2 & 3
                                                              closed

      IDE interface LED disabled                W11          Pins 1 & 2
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2         Bank 3

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

     1.5MB      (2) 256K x 9   (2) 256K x 9   (2) 256K x 9      None

      2MB       (2) 256K x 9   (2) 256K x 9   (2) 256K x 9  (2) 256K x 9

      2MB        (2) 1M x 9       None           None           None

     2.5MB       (2) 1M x 9    (2) 256K x 9      None           None

      3MB        (2) 1M x 9    (2) 256K x 9   (2) 256K x 9      None

     3.5MB       (2) 1M x 9    (2) 256K x 9   (2) 256K x 9  (2) 256K x 9

      4MB        (2) 1M x 9    (2) 1M x 9        None           None

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2          Bank 3

     4.5MB       (2) 1M x 9    (2) 1M x 9     (2) 256K x 9       None

      5MB        (2) 1M x 9    (2) 1M x 9     (2) 256K x 9   (2) 256K x 9

      6MB        (2) 1M x 9    (2) 1M x 9     (2) 1M x 9         None

     6.5MB       (2) 1M x 9    (2) 1M x 9     (2) 1M x 9     (2) 256K x 9

      8MB        (2) 1M x 9    (2) 1M x 9     (2) 1M x 9      (2) 1M x 9

      8MB        (2) 4M x 9       None           None            None

     8.5MB       (2) 4M x 9    (2) 256K x 9      None            None

      9MB        (2) 4M x 9    (2) 256K x 9   (2) 256K x 9       None

     9.5MB       (2) 4M x 9    (2) 256K x 9   (2) 256K x 9   (2) 256K x 9

     10MB        (2) 4M x 9    (2) 1M x 9        None            None

    10.5MB       (2) 4M x 9    (2) 1M x 9     (2) 256K x 9       None

     11MB        (2) 4M x 9    (2) 1M x 9     (2) 256K x 9   (2) 256K x 9

     12MB        (2) 4M x 9    (2) 1M x 9     (2) 1M x 9         None

    12.5MB       (2) 4M x 9    (2) 1M x 9     (2) 1M x 9     (2) 256K x 9

     14MB        (2) 4M x 9    (2) 1M x 9     (2) 1M x 9      (2) 1M x 9

     16MB        (2) 4M x 9    (2) 4M x 9        None            None

    16.5MB       (2) 4M x 9    (2) 4M x 9     (2) 256K x 9       None

     17MB        (2) 4M x 9    (2) 4M x 9     (2) 256K x 9   (2) 256K x 9

     18MB        (2) 4M x 9    (2) 4M x 9     (2) 1M x 9         None

    18.5MB       (2) 4M x 9    (2) 4M x 9     (2) 1M x 9     (2) 256K x 9

     20MB        (2) 4M x 9    (2) 4M x 9     (2) 1M x 9      (2) 1M x 9

     32MB        (2) 4M x 9    (2) 4M x 9     (2) 4M x 9      (2) 4M x 9

                 CACHE CONFIGURATION

      Size             Bank 0           Bank 1

      16KB           (2) 8K x 8          None

      32KB           (2) 8K x 8       (2) 8K x 8

      64KB          (2) 32K x 8          None

  Note: The location of the cache is unidentified.

        CACHE JUMPER CONFIGURATION

        Size                  W9

        16KB          Pins 1 & 2 closed

        32KB          Pins 1 & 2 closed

        64KB          Pins 2 & 3 closed

                              MCLK SELECTION

             Type                      SW1/6                 SW1/7

            41.612MHz                  On                    On

             36.242MHz                  Off                   On

             37.585MHz                  On                    Off

             44.744MHz                  Off                   Off

                             MONITOR SELECTION

          Setting                   SW1/1                   SW1/2

           PS/2 VGA                 Off                     Off

              MDA                     On                     On

             AT VGA                  Off                     On

              CGA                     On                     Off

