
CHICONY, INC.

CK-491K

Processor  CX486S/80486SX/80487SX/CX486DX/80486DX/CX486DX2/80486DX2/
           80486DX4/Pentium Overdrive
Processor  20/25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       64MB
Onboard
DRAM
Cache      32/64/128/256KB
BIOS       AMI
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slots (3)
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J3       Speaker                     J7

  Reset switch                J4       Power LED & keylock         J8

  Turbo switch                J5       32-bit VESA local bus   SL1 - SL3
                                       slots

  Turbo LED                   J6

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Battery type select internal            J3            pins 2 & 3
                                                              closed

      Battery type select external            J3              Closed

     CMOS memory normal operation            JP1              Open

      CMOS memory clear                       JP1             Closed

     Address strobe delay disabled           JP7           pins 1 & 2
                                                              closed

      Address strobe delay enabled            JP7           pins 2 & 3
                                                              closed

     VESA card type select normal           JP19           pins 1 & 2
                                                              closed

      VESA card type select Weitek           JP19           pins 2 & 3
      Power 9000 only                                         closed

     Cyrix C6 not installed                 JP20              Open

      Cyrix C6 installed                     JP20             Closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

     2MB        (1) 512K x        NONE           NONE           NONE
                    36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        NONE
                    36             36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     4MB        (1) 512K x     (1) 512K x        NONE           NONE
                    36             36

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

     5MB        (1) 256K x    (1) 1M x 36        NONE           NONE
                    36

     6MB        (1) 512K x    (1) 1M x 36        NONE           NONE
                    36

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

     7MB        (1) 256K x     (1) 512K x    (1) 1M x 36        NONE
                    36             36

     7MB       (1) 1M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

     8MB       (1) 2M x 36        NONE           NONE           NONE

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

     9MB       (1) 2M x 36     (1) 256K x        NONE           NONE
                                   36

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

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

     13MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

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

     16MB      (1) 2M x 36    (1) 2M x 36        NONE           NONE

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

     17MB      (1) 4M x 36     (1) 256K x        NONE           NONE
                                   36

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

     18MB      (1) 4M x 36     (1) 512K x        NONE           NONE
                                   36

     19MB      (1) 4M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

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

     21MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x        NONE
                                                  36

     22MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

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

     32MB      (1) 8M x 36        NONE           NONE           NONE

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     33MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x        NONE
                                                 36

     33MB       (1) 8M x 36    (1) 256K x       NONE            NONE
                                  36

     34MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x    (1) 256K x 36
                                                 36

     34MB       (1) 8M x 36    (1) 512K x       NONE            NONE
                                  36

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

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

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

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

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

     64MB       (1) 8M x 36   (1) 8M x 36       NONE            NONE

     64MB        (1) 16M x       NONE           NONE            NONE
                    36

                   DRAM JUMPER CONFIGURATION

        Size                 JP21                 JP22

  Double sided SIMM    pins 1 & 2 closed    pins 1 & 2 closed

   16MB x 36 SIMM      pins 2 & 3 closed    pins 2 & 3 closed

                            CACHE CONFIGURATION

       Size              Bank 0            Bank 1              TAG

       32KB            (4) 8K x 8           NONE            (1) 8K x 8

       64KB            (4) 8K x 8        (4) 8K x 8         (1) 8K x 8

       128KB          (4) 32K x 8           NONE            (1) 8K x 8

       256KB          (4) 32K x 8        (4) 32K x 8      (1) 16K or (1)
                                                             32K x 8

                   CACHE JUMPER CONFIGURATION

   Size        JP2        JP3        JP4        JP5       JP6

   32KB       2 & 3      2 & 3      Open       Open       Open

   64KB       1 & 2      1 & 2      Open       Open      Closed

   128KB      2 & 3      2 & 3      Open      Closed     Closed

   256KB      1 & 2      1 & 2     Closed     Closed     Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

        Type               JP15              JP16              JP17

       CX486S            pins 2 & 3          Open              Open
                          closed

       80486SX           pins 2 & 3          Open              Open
                          closed

       80487SX        pins 1 & 2, 3 &      pins 2 & 3          Open
                         4 closed           closed

       CX486DX        pins 1 & 2, 3 &      pins 1 & 2          Open
                         4 closed           closed

       80486DX        pins 1 & 2, 3 &      pins 1 & 2          Open
                         4 closed           closed

      CX486DX2        pins 1 & 2, 3 &      pins 1 & 2         Closed
                         4 closed           closed

      80486DX2        pins 1 & 2, 3 &      pins 1 & 2          Open
                         4 closed           closed

      80486DX4        pins 1 & 2, 3 &      pins 1 & 2          Open
                         4 closed           closed

  Pentium Overdrive   pins 1 & 2, 3 &      pins 1 & 2          Open
                         4 closed           closed

                          CPU SPEED CONFIGURATION

      Speed               JP8               JP9                JP10

      20MHz            pins 1 & 2        pins 2 & 3         pins 2 & 3
                        closed             closed             closed

      25MHz            pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      33MHz            pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      40MHz            pins 1 & 2        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      50iMHz           pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

      50MHz            pins 1 & 2        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      66iMHz           pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

      75iMHz           pins 2 & 3        pins 1 & 2         pins 2 & 3
                        closed             closed             closed

     100iMHz           pins 2 & 3        pins 2 & 3         pins 1 & 2
                        closed             closed             closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP18

          2x            pins 2 & 3 closed

         2.5x           pins 1 & 2 closed

          3x                   Open

                         CPU VOLTAGE CONFIGURATION

     Voltage              P1                 P2                 P3

       3.3v            pins 2 & 3        pins 2 & 3         pins 2 & 3
                        closed             closed             closed

        5v             pins 1 & 2        pins 1 & 2         pins 1 & 2
                        closed             closed             closed

  VESA WAIT STATE CONFIGURATION

   Wait states         JP13

  1 wait state        Closed

  2 wait states        Open

  BUS SPEED CONFIGURATION

  CPU speed        JP14

   <= 33MHz        Open

   > 33MHz        Closed

