CHICONY, INC.

CH-486S-20B/25, CH-486-33G, CH-486-50G

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/50MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            J11       Turbo LED                 JP11

  Speaker                     J21       Reset switch               SW1

  Power LED & keylock         J22       Turbo switch               SW2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP1           pins 1 & 2
                                                              closed

  »   Monitor type select color                JP2            Closed

      Monitor type select monochrome           JP2             Open

  »   Factory configured - do not alter        JP7           pins 2 & 3
                                                              closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

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

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

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

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

                    CACHE CONFIGURATION

     Size         Bank 0-       TAG (U33)      TAG (U34)

     64KB        (8) 8K x 8    (1) 64K x 1    (1) 8K x 8

     256KB      (8) 32K x 8    (1) 64K x 1    (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size               JP9                JP10               JP12

      64KB            pins 2 & 3            Open               Open
                        closed

      256KB           pins 1 & 2           Closed             Closed
                        closed

                          CPU TYPE CONFIGURATION

       Type               JP3               JP4                JP5

      80486SX          pins 1 & 2          Closed           pins 1 & 2
                         closed                              closed

      80487SX             Open              Open            pins 2 & 3
                                                             closed

      80486DX          pins 2 & 3          Closed           pins 1 & 2
                         closed                              closed