
BETHEL ELECTRONICS INTERNATIONAL, INC.

HYF-82481Q

Processor  CX486S/80486SX/SL80486SX/CX486DX/UMCU5/80486DX/SL80486DX/
           CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       128MB
Onboard
DRAM
Cache      128/256/512/1024KB
BIOS       Award
Dimensions 250mm x 220mm
I/O        32-bit VESA local bus slots (3)
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  Chassis fan power          CN1       Turbo switch               JP9

  Speaker                    JP6       Power LED & keylock        JP10

  Reset switch               JP7       32-bit VESA local bus   SL1 - SL3
                                       slots

  Turbo LED                  JP8

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            JP3              Open

      CMOS memory clear                       JP3             Closed

     Turbo switch enabled                    JP9              Open

      Turbo switch disabled                   JP9             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

     4MB         (1) 256K x     (1) 256K x     (1) 512K x        NONE
                    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) 256K x     (1) 256K x    (1) 1M x 36        NONE
                    36             36

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

     8MB         (1) 256K x     (1) 256K x     (1) 512K x    (1) 1M x 36
                    36             36             36

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

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

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

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                    36             36

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

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

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

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

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

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

     20MB        (1) 512K x     (1) 512K x    (1) 4M x 36        NONE
                    36             36

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

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

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

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

     36MB        (1) 512K x     (1) 512K x    (1) 4M x 36    (1) 4M x 36
                    36             36

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

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

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

     40MB       (1) 1M x 36    (1) 1M x 36    (1) 8M x 36        NONE

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

     48MB       (1) 4M x 36    (1) 8M x 36       NONE            NONE

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

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

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 8M x 36        NONE

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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     65MB         (1) 256K x     (1) 16M x        NONE           NONE
                     36             36

     68MB        (1) 1M x 36     (1) 16M x        NONE           NONE
                                    36

     68MB        (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     72MB        (1) 1M x 36    (1) 1M x 36     (1) 16M x        NONE
                                                   36

     72MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36   (1) 8M x 36

     80MB        (1) 4M x 36     (1) 16M x        NONE           NONE
                                    36

     80MB        (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     96MB        (1) 4M x 36    (1) 4M x 36     (1) 16M x        NONE
                                                   36

     96MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       NONE

     128MB       (1) 16M x 36    (1) 16M x        NONE           NONE
                                    36

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

      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) 32K x 8

     512KB        (4) 64K x 8        NONE        (1) 32K x 8

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 32K x 8

                          CPU TYPE CONFIGURATION

       Type               JP11              JP12                W3

      80486SX          pins 2 & 3         pins 2 & 3        pins 1 & 2
                         closed            closed             closed

      80486DX          pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed

  80486DX2 (3.3v)      pins 1 & 2         pins 1 & 2        pins 1 & 2
                         closed            closed             closed

   80486DX2 (5v)       pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed

  80486DX4 (3.3v)      pins 1 & 2         pins 1 & 2        pins 2 & 3
                         closed            closed             closed

   80486DX4 (5v)       pins 2 & 3         pins 2 & 3        pins 2 & 3
                         closed            closed             closed

                CPU SPEED CONFIGURATION

           Speed                        W1

           25MHz                       Open

           33MHz             pins 1 & 2, 3 & 4 closed

           40MHz                 pins 3 & 4 closed

           50iMHz                      Open

           50MHz                 pins 1 & 2 closed

           66iMHz            pins 1 & 2, 3 & 4 closed

           75iMHz                      Open

          100iMHz            pins 1 & 2, 3 & 4 closed

