
ZENY COMPUTERS

ZEN 3486

Processor             80386DX/80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       20/25/33/40/50(internal)/50/66(internal) MHz
Chip Set              UMC
Max. Onboard DRAM     48MB
SRAM Cache            64/128KB
BIOS                  AMI
Dimensions            330mm x 218mm
I/O Options           None
NPU Options           80387/3167

[Image]

                                CONNECTIONS

  Function                  Location   Function                  Location

  Speaker                     J2       Turbo LED                   J5

  External Battery            J3       Reset switch                J6

  Power LED & keylock         J4       Turbo Switch                W22

                        USER CONFIGURABLE SETTINGS

                Function                     Location         Setting

     Battery select internal                   J1             Closed

      Battery select external                   J1              Open

     Factory configured - do not alter         W3              Open

     Factory configured - do not alter         W4              Open

     NPU Select 3187 or none               W15 & W20           Open

      NPU Select 80387                      W15 & W20          Closed

     Factory configured do not alter          W16              Open

     NPU synchronous with CPU                 W19              Open

                                               W21           pins 1 & 2
                                                               closed

      NPU sysnchronous with oscillator         W19             Closed
      installed at Y1
                                               W21           pins 2 & 3
                                                               closed

     Factory configured - do not alter        W23              Open

     Factory configured - do not alter        W27              Open

     Factory configured - do not alter        W28              Open

     CMOS memory normal operation             W29           pins 1 & 2
                                                               closed

      CMOS memory clear                        W29           pins 2 & 3
                                                               closed

  Note: W27 & W28 may not be present on later revisions

                             CPU CONFIGURATION

    Type          CPU       OSC       W14       W24       W25       W26
                Speed

   80386DX      33MHz      66MHz     Open      Open       N/A       N/A

   80386DX      40MHz      80MHz     Open      Open       N/A       N/A

   80486SX      20MHz      20MHz    Closed     Open      pins 2     Open
                                                          & 3

   80486SX      20MHz      40MHz    Closed     Open      pins 2     Open
                                                          & 3

   80486SX      25MHz      25MHz    Closed     Open      pins 2     Open
                                                          & 3

   80486SX      25MHz      50MHz    Closed    Closed     pins 2     Open
                                                          & 3

   80487SX      25MHz      25MHz    Closed     Open      pins 1    pins 2
                                                         & 2 and    & 3
                                                         3 & 4

   80486DX      33MHz      33MHz    Closed     Open      pins 1    pins 1
                                                         & 2 and    & 2
                                                         3 & 4

   80486DX      33MHz      66MHz    Closed    Closed     pins 1    pins 1
                                                         & 2 and    & 2
                                                         3 & 4

   80486DX      50MHz      50MHz    Closed     Open      pins 1    pins 1
                                                         & 2 and    & 2
                                                         3 & 4

  ODP486SX      50iMHz     25MHz    Closed     Open      pins 1    pins 2
                                                         & 2 and    & 3
                                                         3 & 4

  80486DX2      50iMHz     25MHz    Closed     Open      pins 1    pins 1
                                                         & 2 and    & 2
                                                         3 & 4

  80486DX2      50iMHz     50MHz    Closed    Closed     pins 1    pins 1
                                                         & 2 and    & 2
                                                         3 & 4

  Note:pins designated should be in the closed position.

                            DRAM CONFIGURATION

    Size       Bank 0       Bank 1       Bank 2        W5          W6

    1MB       (4) 256K x     None         None       pins 1 &    pins 1 &
                  9                                     2           2

    2MB       (4) 256K x  (4) 256K x      None       pins 1 &    pins 1 &
                  9           9                         2           2

    3MB       (4) 256K x  (4) 256K x   (1) 256K x    pins 2 &    pins 2 &
                  9           9            36           3           3

    4MB       (4) 1M x 9     None         None       pins 1 &    pins 1 &
                                                        2           2

    5MB       (4) 256K x  (4) 1M x 9      None       pins 1 &    pins 1 &
                  9                                     2           2

    6MB       (4) 256K x  (4) 256K x    (1) 1M x     pins 2 &    pins 2 &
                  9           9            36           3           3

    8MB       (4) 1M x 9  (4) 1M x 9      None       pins 1 &    pins 1 &
                                                        2           2

    9MB       (4) 1M x 9  (4) 1M x 9   (1) 256K x    pins 2 &    pins 2 &
                                           36           3           3

    10MB      (4) 256K x  (4) 256K x    (1) 2M x     pins 2 &    pins 2 &
                  9           9            36           3           3

    12MB      (4) 1M x 9  (4) 1M x 9    (1) 1M x     pins 2 &    pins 2 &
                                           36           3           3

    16MB      (4) 1M x 9  (4) 1M x 9    (1) 2M x     pins 2 &    pins 2 &
                                           36           3           3

    16MB      (4) 4M x 9     None         None       pins 1 &    pins 1 &
                                                        2           2

    17MB      (4) 256K x  (4) 4M x 9      None       pins 1 &    pins 1 &
                  9                                     2           2

    18MB      (4) 256K x  (4) 256K x    (1) 4M x     pins 2 &    pins 2 &
                  9           9            36           3           3

    20MB      4) 1M x 9   (4) 4M x 9      None       pins 1 &    pins 1 &
                                                        2           2

    24MB      (4) 1M x 9  (4) 1M x 9    (1) 4M x     pins 2 &    pins 2 &
                                           36           3           3

    32MB      (4) 4M x 9  (4) 4M x 9      None       pins 1 &    pins 1 &
                                                        2           2

    33MB      (4) 4M x 9  (4) 4M x 9   (1) 256K x    pins 2 &    pins 2 &
                                           36           3           3

    36MB      (4) 4M x 9  (4) 4M x 9    (1) 1M x     pins 2 &    pins 2 &
                                           36           3           3

    40MB      (4) 4M x 9  (4) 4M x 9    (1) 2M x     pins 2 &    pins 2 &
                                           36           3           3

    48MB      (4) 4M x 9  (4) 4M x 9    (1) 4M x     pins 2 &    pins 2 &
                                           36           3           3

  Note: pins designated should be in the closed position.

                         SRAM JUMPER CONFIGURATION

     Jumper          32KB           64KB          128KB         256KB

       W1          pins 2 & 3    pins 1 & 2     pins 2 & 3    pins 1 & 2
                    closed         closed        closed         closed

       W2            Open           Open        pins 1 & 2    pins 2 & 3
                                                 closed         closed

       W7          pins 1 & 2    pins 2 & 3     pins 2 & 3    pins 2 & 3
                    closed         closed        closed         closed

       W8          pins 1 & 2    pins 1 & 2     pins 2 & 3    pins 2 & 3
                    closed         closed        closed         closed

       W9          pins 1 & 2    pins 1 & 2     pins 1 & 2    pins 2 & 3
                    closed         closed        closed         closed

      W10            Open          Closed        Closed         Closed

      W11            Open          Closed        Closed         Closed

      W12            Open           Open          Open          Closed

      W13            Open           Open         Closed         Closed

      W17            Open           Open          Open          Closed

      W18            Open           Open         Closed         Closed

    Cacheable         8MB           16MB          32MB           64MB
     Region

  Note: W10 may not be present on later revisions

