
UNIDENTIFIED

TOPCAT 386SX

Processor         80386SX
Processor Speed   16/20/25MHz
Chip Set          Unidentified
Max. Onboard DRAM 32MB
Cache             None
BIOS              AMI/Award/Phoenix/Quadtel
Dimensions        236mm x 220mm
I/O Options       None
NPU Options       80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                     CN1       Turbo LED                  JP1

  External battery            CN3       Turbo switch               JP6

  Power LED & keylock         CN4       Reset switch              JP10

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper        Position

      Power good signal detect from board       CN2          pins 1 & 2
                                                              closed

      Power good signal detect from power       CN21         pins 2 & 3
      supply                                                  closed

      CMOS memory normal operation              HDR1         pins 1 & 2
                                                              closed

      CMOS memory clear                         HDR1         pins 3 & 4
                                                              closed

      BIOS type select Phoenix                  JP2          pins 1 & 2
                                                              closed

      BIOS type select AMI/Award/Quadtel        JP2          pins 2 & 3
                                                              closed

      CPU speed select hardware/external        JP3          pins 1 & 2
      switch                                                  closed

      CPU speed select keyboard control         JP3          pins 2 & 3
                                                              closed

      Monitor type select color                 JP4           Closed

      Monitor type select monochrome            JP4            Open

      Parity enabled                            JP7           Closed

      Parity disabled                           JP7            Open

                            DRAM CONFIGURATION

   Size      Bank 0A     Bank 1A    Bank 0    Bank 1     Bank 2   Bank 3

   512KB        (4)       NONE       NONE      NONE      NONE      NONE
              44256

    1MB         (4)        (4)       NONE      NONE      NONE      NONE
              44256       44256

   1.5MB        (4)       NONE        (2)       (2)      NONE      NONE
              44256                  256K x    256K x
                                       9         9

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

    3MB         (4)        (4)       (2) 1M    NONE      NONE      NONE
              44256       44256       x 9

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

   4.5MB        (4)       NONE       (2) 1M    (2) 1M    NONE      NONE
              44256                   x 9       x 9

    5MB         (4)        (4)       (2) 1M    (2) 1M    NONE      NONE
              44256       44256       x 9       x 9

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

    8MB        NONE       NONE       (2) 1M    (2) 1M    (2) 1M    (2) 1M
                                      x 9       x 9       x 9       x 9

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

    9MB         (4)        (4)       (2) 1M    (2) 1M    (2) 1M    (2) 1M
              44256       44256       x 9       x 9       x 9       x 9

    9MB         (4)        (4)       (2) 4M    NONE      NONE      NONE
              44256       44256       x 9

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

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

  16.5MB        (4)       NONE       (2) 4M    (2) 4M    NONE      NONE
              44256                   x 9       x 9

   17MB         (4)        (4)       (2) 4M    (2) 4M    NONE      NONE
              44256       44256       x 9       x 9

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

   20MB        NONE       NONE       (2) 1M    (2) 1M    (2) 4M    (2) 4M
                                      x 9       x 9       x 9       x 9

   20MB        NONE       NONE       (2) 4M    (2) 4M    (2) 1M    (2) 1M
                                      x 9       x 9       x 9       x 9

   24MB        NONE       NONE       (2) 4M    (2) 4M    (2) 4M    NONE
                                      x 9       x 9       x 9

   32MB        NONE       NONE       (2) 4M    (2) 4M    (2) 4M    (2) 4M
                                      x 9       x 9       x 9       x 9

                         DRAM PARITY CONFIGURATION

          Size                     P 0                      P 1

          512KB                 (2) 41256                   NONE

           1MB                  (2) 41256                (2) 41256

          1.5MB                 (2) 41256                (2) 41256

           3MB                  (2) 41256                (2) 41256

          4.5MB                 (2) 41256                   NONE

           5MB                  (2) 41256                (2) 41256

           9MB                  (2) 41256                (2) 41256

           9MB                  (2) 41256                (2) 41256

         16.5MB                 (2) 41256                   NONE

          17MB                  (2) 41256                (2) 41256

          17MB                  (2) 41256                (2) 41256

  Note: If Bank 0A and/or Bank 1A is filled, use this table to determine
  correct parity.

