
CHAINTECH COMPUTER COMPANY, LTD.

416SX/420SX/425SX/433SC/450SC

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set         SIS
Max. Onboard DRAM64MB
Cache            32/64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      None
NPU Options      4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Reset switch                J1       Speaker                     J4

  Turbo switch                J2       Power LED & keylock         J5

  Turbo LED                   J3       External battery            J7

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Turbo enabled                            J2             Closed

      Turbo disabled                           J2              Open

     Monitor type select monochrome           J6              Open

      Monitor type select color                J6             Closed

     Factory configured - do not             JP7              Open
      alter

     CMOS memory normal operation            JP17          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP17          pins 2 & 3
                                                              closed

     Factory configured - do not             JP18             Open
      alter

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     1MB         (1) 256K x        NONE           NONE           NONE
                     36

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

     2MB         (1) 256K x     (1) 256K x        NONE           NONE
                     36             36

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

     4MB        (1) 1M x 36        NONE           NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9    (1) 1M x 36       NONE

     8MB         (4) 1M x 9     (4) 1M x 9        NONE           NONE

     8MB        (1) 1M x 36    (1) 1M x 36        NONE           NONE

     10MB       (4) 256K x 9   (4) 256K x 9    (1) 1M x 36   (1) 1M x 36

     12MB        (4) 1M x 9     (4) 1M x 9     (1) 1M x 36       NONE

     16MB       (1) 1M x 36    (1) 1M x 36     (4) 1M x 9     (4) 1M x 9

     16MB        (4) 1M x 9     (4) 1M x 9     (1) 1M x 36   (1) 1M x 36

     16MB       (1) 4M x 36        NONE           NONE           NONE

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

     18MB       (4) 256K x 9   (4) 256K x 9    (1) 4M x 36       NONE

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

     20MB       (1) 1M x 36    (1) 4M x 36        NONE           NONE

     24MB        (4) 1M x 9     (4) 1M x 9     (1) 4M x 36       NONE

     24MB       (1) 4M x 36    (1) 1M x 36     (4) 1M x 9        NONE

     32MB       (1) 4M x 36    (1) 4M x 36        NONE           NONE

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

     36MB       (1) 1M x 36     (4) 4M x 9     (4) 4M x 9        NONE

     36MB        (4) 4M x 9     (4) 4M x 9     (1) 1M x 36       NONE

     36MB       (1) 4M x 36    (1) 4M x 36     (4) 1M x 9        NONE

     40MB       (1) 1M x 36    (1) 1M x 36     (4) 4M x 9     (4) 4M x 9

     40MB        (4) 4M x 9     (4) 4M x 9     (1) 1M x 36   (1) 1M x 36

     40MB       (1) 4M x 36    (1) 4M x 36     (4) 1M x 9     (4) 1M x 9

     40MB        (4) 1M x 9     (4) 1M x 9     (1) 4M x 36   (1) 4M x 36

     48MB        (4) 4M x 9     (4) 4M x 9     (1) 4M x 36       NONE

     48MB       (1) 4M x 36    (1) 4M x 36     (4) 4M x 9        NONE

     64MB        (4) 4M x 9     (4) 4M x 9     (1) 4M x 36   (1) 4M x 36

     64MB       (1) 4M x 36    (1) 4M x 36     (4) 4M x 9     (4) 4M x 9

                         DRAM JUMPER CONFIGURATION

     Type           JP1            JP2           JP20            JP21

   Option 1      pins 1 & 2     pins 1 & 2     pins 1 & 2     pins 1 & 2
                  closed         closed         closed          closed

   Option 2      pins 2 & 3     pins 2 & 3     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

  Note: Option 1- Banks 0 & 1 use x 9 SIMMS and Banks 2 & 3 use X 36
  SIMMS.

  Option 2- Banks 0 & 1 use x 36 SIMMS and Banks 2 & 3 use X 9 SIMMS.

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

     32KB        (4) 8K x 8       NONE

     64KB        (4) 8K x 8    (4) 8K x 8

     128KB       (4) 32K x 8      NONE

     256KB       (4) 32K x 8   (4) 32K x 8

                        CACHE JUMPER CONFIGURATION

    Size          JP8            JP9            JP10            JP11

    32KB       pins 1 & 2     pins 1 & 2      pins 1 & 2      pins 1 & 2
                 closed         closed         closed          closed

    64KB       pins 2 & 3     pins 1 & 2      pins 1 & 2      pins 2 & 3
                 closed         closed         closed          closed

   128KB       pins 2 & 3     pins 2 & 3      pins 1 & 2      pins 2 & 3
                 closed         closed         closed          closed

   256KB       pins 2 & 3     pins 2 & 3      pins 2 & 3      pins 2 & 3
                 closed         closed         closed          closed

             CACHE JUMPER CONFIGURATION (CON'T)

   Size      JP12      JP13       JP14      JP15      JP16

   32KB      1 & 2     1 & 2     1 & 2     1 & 2     1 & 2

   64KB      1 & 2     1 & 2     2 & 3     2 & 3     1 & 2

  128KB      2 & 3     1 & 2     1 & 2     1 & 2     2 & 3

  256KB      2 & 3     2 & 3     2 & 3     2 & 3     2 & 3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type                JP4               JP5               JP6

      80486SX           pins 2 & 3          Open               Open
                         closed

     ODP486SX           pins 1 & 2         Closed           pins 2 & 3
                         closed                               closed

      80487SX           pins 1 & 2         Closed           pins 2 & 3
                         closed                               closed

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

     80486DX2           pins 1 & 2         Closed           pins 1 & 2
                         closed                               closed

         CPU SPEED CONFIGURATION

        Speed                JP3

        16MHz         pins 2 & 3 closed

        20MHz         pins 2 & 3 closed

       > 25MHz        pins 1 & 2 closed

                       MISCELLANEOUS TECHNICAL NOTE

  Note:Depending on board version, cache and accompanying jumpers may not
  be present.

