
UNIDENTIFIED

CNESXO-20

Processor         80386SX
Processor Speed   20MHz
Chip Set          Unknown
Max. Onboard DRAM 16MB
Cache             32/64KB
BIOS              AMI
Dimensions        330.2mm x 218.4mm
I/O Options       None
NPU Options       80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                  JP8

  Speaker                     J21       Reset switch               S2

  Power LED & keylock         J22       Turbo switch               S3

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation            JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP1           pins 1 & 2
                                                              closed

                         DRAM (SIMM) 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) 256K x 9   (2) 1M x 9        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

                         DRAM (DIP) CONFIGURATION

    Size         Bank 0         Bank 1         Bank 2          Bank 3

     1MB        (4) 44256        NONE           NONE            NONE
                   and

                (2) 41256

     2MB        (4) 44256      (4) 44256        NONE            NONE
                   and            and

                (2) 41256      (2) 41256

     3MB        (4) 44256      (4) 44256      (4) 44256         NONE
                   and            and            and

                (2) 41256      (2) 41256      (2) 41256

     4MB        (4) 44256      (4) 44256      (4) 44256     (4) 44256 and
                   and            and            and
                                                              (2) 41256
                (2) 41256      (2) 41256      (2) 41256

                         SRAM JUMPER CONFIGURATION

  Size     JP3      JP4     JP5       JP6       JP7      JP100     JP101

  32KB     pins     pins    pins    closed      open     pins 2    pins 1
           2 & 3   1 & 2    1 & 2                         & 3       & 2

  64KB     pins     pins    pins     open      closed    pins 2    pins 2
           2 & 3   2 & 3    2 & 3                         & 3       & 3

  Note:Pins designated should be in the closed posiiton.

                            SRAM CONFIGURATION

  Size     Cache SRAM         Location                   TAG

  32KB     (4) 8K x 8       Banks 0 & 1              (2) 16K x 4

  64KB     (2) 32K x 8         Bank 0                (2) 16K x 4

