
CHEERFUL INTERNATIONAL CORPORATION

S680


Processor         80386SX
Processor Speed   16MHz
Chip Set          Intel
Max. Onboard DRAM 2MB
Cache             None
BIOS              AMI
Dimensions        330.2mm x 218.4mm
I/O Options       None
NPU Options       80387SX


[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                 Location

  Reset switch             CN1        Speaker                    CN4

  Turbo switch             CN2        Power LED & keylock        CN7

  Turbo LED                CN3        External battery           CN8

  Note:CN2 can be connected to a turbo switch, however the manufacturer
  recommends that the computer be turned off before changing the CPU
  speed.

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper          Position

     CPU speed select fast                  CN2             closed

      CPU speed select slow                  CN2              open

     Battery select internal                CN9        pins 2 & 3 closed

      Battery select external                CN9        pins 1 & 2 closed

     Monitor type select monochrome         JP2              open

      Monitor type select color              JP2             closed

     BIOS type select 2764                  JP4        pins 1 & 2 closed

      BIOS type select 27128                 JP4        pins 2 & 3 closed

     Factory configured - do not            JP10            unknown
      alter

     Factory configured - do not            JP11            unknown
      alter

     Factory configured - do not            JP12            unknown
      alter

                            DRAM CONFIGURATION

  Size       Bank 0       Bank 1       Bank 2     Bank 3       E1 - E8

  512KB    (18) 41256      NONE         NONE       NONE       pins 1 & 2
                                                                closed

  512KB       NONE         NONE       (2) 256K     NONE       pins 2 & 3
                                        x 9                     closed

   1MB     (18) 41256    (18) 41256     NONE       NONE       pins 1 & 2
                                                                closed

   1MB        NONE         NONE       (2) 256K    (2) 256K    pins 2 & 3
                                        x 9         x 9         closed

  1.5MB    (18) 41256    (18) 41256   (2) 256K     NONE       pins 1 & 2
                                        x 9                     closed

   2MB     (18) 41256    (18) 41256   (2) 256K    (2) 256K    pins 1 & 2
                                        x 9         x 9         closed

   2MB        (18)         NONE         NONE       NONE       pins 1 & 2
             411000                                             closed

   2MB        NONE         NONE       (2) 1M x     NONE       pins 2 & 3
                                         9                      closed

   4MB        (18)          (18)        NONE       NONE       pins 1 & 2
             411000       411000                                closed

   4MB        NONE         NONE       (2) 1M x    (2) 1M x    pins 2 & 3
                                         9           9          closed

   6MB        (18)          (18)      (2) 1M x     NONE       pins 1 & 2
             411000       411000         9                      closed

   8MB        (18)          (18)      (2) 1M x    (2) 1M x    pins 1 & 2
             411000       411000         9           9          closed

                          DRAM MODE CONFIGURATION

       Mode           DRAM type            JP8                 JP9

  Page Mode (Four       100ns           pins 1 & 2      pins 1 & 2 closed
      page)                               closed

  Page Mode (One        100ns           pins 2 & 3      pins 1 & 2 closed
      page)                               closed

    Fast mode           100ns           pins 1 & 2      pins 2 & 3 closed
                                          closed

    Slow mode           120ns           pins 2 & 3      pins 2 & 3 closed
                                          closed

