
WYSE TECHNOLOGY, INC.

WYSE DECISION 486SE

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  16/20/25/33/50(Internal)/50/66(Internal)
Chip Set         OPTI
Max. Onboard DRAM128MB
SRAM Cache       128/256/512KB
BIOS             Phoenix
Dimensions       330mm x 218mm
I/O Options      32-bit local bus slots (2), CPU processor slot
NPU Options      4167

[Image]

                                CONNECTIONS

  Purpose                  Location   Purpose                    Location

  Speaker                    J1       32-bit local bus slot        SL1

  Power LED & keylock        J2       32-bit local bus slot        SL2

  Reset switch               S1       CPU processor slot           SL3

                  USER CONFIGURABLE SETTINGS SYSTEM BOARD

                Function                      Jumper         Position

     Factory configured - do not alter        JP1            closed

     Factory configured - do not alter        JP2            closed

     Factory configured - do not alter        JP3            closed

     Factory configured - do not alter        JP4            closed

     Factory configured - do not alter        JP5            closed

     Factory configured - do not alter        JP6            closed

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

     Monitor type select color                JP8            closed

      Monitor type select monochrome           JP8             open

     Factory configured - do not alter        JP12           closed

     Factory configured - do not alter        JP13           closed

     Factory configured - do not alter        JP14           closed

     Factory configured - do not alter        JP15            open

     Factory configured - do not alter        JP16           closed

             DRAM CONFIGURATION

     Size          Bank 0        Bank 1

      4MB        (4) 1M x 9       NONE

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

     16MB        (4) 4M x 9       NONE

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

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

     64MB        (4) 16M x 9      NONE

     128MB       (4) 16M x 9   (4) 16M x 9

                          BUS CLOCK CONFIGURATION

           Speed                 JP9            JP10            JP11

             25MHz             Open           Open         pins 2 & 3
                                                               closed

              33MHz            Closed          Open         pins 1 & 2
                                                               closed

      16MHz synchronous         Open           Open         pins 2 & 3
                                                               closed

      20MHz synchronous         Open           Open         pins 2 & 3
                                                               closed

       25MHz synchronous        Closed          Open         pins 1 & 2
                                                               closed

       50MHz synchronous        Closed          Open         pins 1 & 2
                                                               closed

[Image]

                   USER CONFIGURABLE SETTINGS CPU BOARD

                  Function                      Jumper        Position

     Factory configured - do not alter           JP4           open

     Factory configured - do not alter           JP5          closed

     Clock generator/oscillator enabled         JP14         pins 1 & 2
                                                               closed

      Clock generator/oscillator disabled        JP14         pins 2 & 3
                                                               closed

  Note: Clock generator is installed in U34 on board X770171 and in U33
  on board Y77071.

                         SRAM JUMPER CONFIGURATION

  Size      JP6       JP8      JP9      JP10     JP11     JP12      JP13

  128KB    pins 1    closed    open     open     closed   open      open
            & 2
          closed

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

  512KB    pins 1    closed   closed   closed    closed   closed   closed
            & 2
          closed

                            SRAM CONFIGURATION

  Size    Cache    Location    TAG/U26    TAG/U27    TAG/U16      Dirty
                                                                Bit/U25

  64KB    (8) 8K   Banks 0 &    NONE       NONE      (1) 16K    (1) 64K x
           x 8         1                               x 1         1

  128KB     (4)     Bank 0      NONE      (1) 8K x   (1) 16K    (1) 64K x
           32K x                             8         x 1         1
            8

  256KB     (8)    Banks 0 &   (1) 8K x   (1) 8K x   (1) 16K    (1) 64K x
           32K x       1          8          8         x 1         1
            8

  512KB     (8)     Bank 0      NONE      (1) 32K    (1) 64K    (1) 64K x
          128K x                            x 8        x 1         1
            8

  Note: For Tag Ram U16 may be occupied with 64K x 1 chips.

                          CPU SPEED CONFIGURATION

      Type        CPU Speed      JP1         JP2       JP3        JP7

    80486SX        16MHz      pins 2 & 3    pins 2    open        open
                                             & 3

    80487SX        16MHz       closed       pins 2    pins 1      open
                                             & 3       & 2

    80486SX        20MHz      pins 2 & 3    pins 2    open        open
                                             & 3

    80487SX        20MHz       closed       pins 2    pins 1      open
                                             & 3       & 2

    80486SX        25MHz      pins 2 & 3    pins 2    open       closed
                                             & 3

    80486SX        33MHz      pins 2 & 3    pins 2    open       closed
                                             & 3

    80486DX        25MHz       closed       pins 2    pins 2     closed
                                             & 3       & 3

    80486DX        33MHz       closed       pins 2    pins 2     closed
                                             & 3       & 3

  80486DX2/50i     25MHz       closed       pins 2    pins 2     closed
                                             & 3       & 3

  80486DX2/66i     33MHz       closed       pins 2    pins 2     closed
                                             & 3       & 3

  Note: Pins designated should be in the closed position.

                  CPU TYPE CONFIGURATION SWITCH 1 BOARD X77017

       Type         SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

  80486SX/16MHz     off     on      off     on      on     off      on     off

  80487SX/16MHz     off     on      off     on      on     off      on     off

  80486SX/20MHz     off     off     off     on      on     off      on     off

  80487SX/20MHz     off     off     off     on      on     off      on     off

  80486SX/25MHz     off     on      on      off     on     off      on     off

  80486SX/33MHz     off     on      on      off     on     off      on     off

  80486DX/25MHz     off     on      on      off     on     off      on     off

  80486DX/33MHz     off     on      on      off     on     off      on     off

  80486DX2/50iMHz   off     on      on      off     on     off      on     off

  80486DX2/66iMHz   off     off     on      off     on     off      on     off

                  CPU TYPE CONFIGURATION SWITCH 1 BOARD Y77017

       Type         SW1/1  SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

  80486SX/16MHz      on     off     off     on      on     off      on     off

  80487SX/16MHz      on     off     off     on      on     off      on     off

  80486SX/20MHz     off     off     on      on      on     off     off     off

  80487SX/20MHz     off     off     on      on      on     off     off     off

  80486SX/25MHz     off     off     on      on      on     off      on     off

  80486SX/33MHz     off     on      on      on      on     off      on     off

  80486DX/25MHz      on     off     on      on      on     off      on     off

  80486DX/33MHz     off     on      on      on      on     off      on     off

  80486DX2/50iMHz    on     on      on      on      on     off      on     off

  80486DX2/66iMHz   off     off     on      on      on     off      on     off


