CACHE COMPUTERS, INC.

386SX-20/25 PLUS (Model 320)


Processor              80386SX
Processor Speed        20/25MHz
Chip Set               OPTI
Max. Onboard DRAM      16MB
Cache                  64KB
BIOS                   AMI/Cache/Phoenix
Dimensions             330mm x 218mm
I/O Options            Parallel port, serial ports (2), game port, floppy
                       drive interface, IDE interface
NPU Options            80387SX

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                 Location

  Auxiliary                J2         COM2 at 2F8-2FFh           P2
  keyboard

  External battery         JP1        Game port at 201h          P3

  IDE LED                  JP8        Parallel port at           P5
                                      378-37Fh

  Turbo LED               JP12        IDE interface              P6

  Speaker                 JP13        Floppy drive               P7
                                      interface

  Power LED &             JP14        Reset switch              SW1
  keylock

  COM1 at 3F8-3FFh         P1         Turbo switch              SW2

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Parallel port enabled                  JP3             pins 1 & 2
                                                               closed

      Parallel port disabled                 JP3             pins 2 & 3
                                                               closed

  »   IRQ 7 enabled                          JP5               Closed

      IRQ 7 disabled                         JP5                Open

  »   IRQ 3 enabled                          JP6               Closed

      IRQ 3 disabled                         JP6                Open

  »   IRQ 4 enabled                          JP7               Closed

      IRQ 4 disabled                         JP7                Open

  »   Monitor type set color (AMI            JP9               Closed
      BIOS)

      Monitor type set monochrome            JP9                Open
      (AMI BIOS)

  »   Security enabled (MR BIOS)             JP9               Closed

      Security disabled (MR BIOS)            JP9                Open

  »   CMOS memory normal operation          JP11                Open

      CMOS memory clear                     JP11               Closed

  »   CPU speed switchable from             JP15             pins 1 & 2
      keyboard                                                 closed

      CPU speed switchable from             JP15             pins 2 & 3
      turbo switch                                             closed

  »   IDE interface enabled                 SW3/1               Off

      IDE interface disabled                SW3/1                On

  »   Floppy interface enabled              SW3/2               Off

      Floppy interface disabled             SW3/2                On

  »   Factory configured - do not           SW3/3               N/A
      alter

  »   Floppy interface select               SW3/9                On
      primary (only with 2
      controllers)

      Floppy interface select               SW3/9               Off
      secondary (only with 2
      controllers)

  »   Configuration select manual          SW3/10                On

      Configuration select                 SW3/10               Off
      automatic

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

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

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

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

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

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

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

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

                CACHE CONFIGURATION

           Size                     Bank 0

           64KB                   (8) 8K x 8

  Note:The location of the cache is unidentified.

                        PARALLEL PORT CONFIGURATION

           Setting                    SW3/7                  SW3/8

  »            LPT2                    Off                    Off

               LPT1                    Off                    On

               LPT3                     On                    Off

             Disabled                   On                    On

                         SERIAL PORT CONFIGURATION

   Serial port      Serial port      SW3/4         SW3/5         SW3/6
      (P1)             (P2)

      COM1             COM2           Off           Off           Off

    Disabled           COM2           Off           Off           On

      COM1           Disabled         Off           On            Off

    Disabled         Disabled         Off           On            On

      COM2             COM1            On           Off           Off

    Disabled           COM1            On           Off           On

      COM2           Disabled          On           On            Off

    Disabled         Disabled          On           On            On