
JETPRO INFOTECH COMPANY, LTD.

MB-6U(MB-450CBU)

Processor              80386DX/80486SX/80487SX/80486DX/80486DX2
Processor Speed        20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set               UMC
Max. Onboard DRAM      64MB
SRAM Cache             64/256KB
BIOS                   AMI
Dimensions             330mm x 218mm
I/O Options            32-bit proprietary local bus card
NPU Options            80387/3167

[Image]

                                CONNECTIONS

  Purpose              Location     Purpose                    Location

  Reset switch            J5        Power LED & keylock           J9

  Turbo LED               J6        External battery             J11

  Turbo switch            J7        32-bit proprietary            S1
                                    local bus card

  Speaker                 J8

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

     CMOS memory normal operation              W1            closed

      CMOS memory clear                         W1             open

     Monitor type select color                 W2            closed

      Monitor type select monochrome            W2             open

     Factory configured-do not alter           W3             open

     Tag mode select write back enabled        W15            open
      (tag installed at U45)

      Tag mode select write back                W15            open
      disabled (tag not installed at
      U45)

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      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

                         CPU JUMPER CONFIGURATION

      Size         OSC2      W5       W10       W11       W19       W22

   80386DX/25     50MHz     open      N/A       N/A      open       N/A

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

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

   80486SX/20     20MHz     open      open     pins 1    closed    1 & 2
                                                & 2               and 3 &
                                                                     4

   80486SX/20     40MHz     open      open     pins 2    closed    1 & 2
                                                & 3               and 3 &
                                                                     4

   80487SX/20     20MHz     closed   pins 2    pins 1    closed    1 & 2
                                      & 3       & 2               and 3 &
                                                                     4

   80487SX/20     40MHz     closed   pins 2    pins 2    closed    1 & 2
                                      & 3       & 3               and 3 &
                                                                     4

   80486DX/25     25MHz     open     pins 1    pins 1    closed    1 & 2
                                      & 2       & 2               and 3 &
                                                                     4

   80486DX/25     50MHz     open     pins 1    pins 2    closed    1 & 2
                                      & 2       & 3               and 3 &
                                                                     4

   80486DX/33     33MHz     open     pins 1    pins 1    closed    1 & 2
                                      & 2       & 2               and 3 &
                                                                     4

   80486DX/33     66MHz     open     pins 1    pins 2    closed    1 & 2
                                      & 2       & 3               and 3 &
                                                                     4

   80486DX/50     50MHz     open     pins 1    pins 1    closed    1 & 2
                                      & 2       & 2               and 3 &
                                                                     4

  Note:Pins designated should be in the closed position

  NPU JUMPER CONFIGURATION

   Size      W8       W20

  80387     closed   closed

   3167     open      open

                         SRAM JUMPER CONFIGURATION

    Jumper         32KB           64KB           128KB          256KB

     W12         pins 1 & 2     pins 2 & 3     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

     W13         pins 1 & 2     pins 1 & 2     pins 2 & 3     pins 2 & 3
                  closed         closed         closed          closed

     W14         pins 1 & 2     pins 1 & 2     pins 1 & 2     pins 2 & 3
                  closed         closed         closed          closed

     W15           open           open           open            open

     W17         pins 2 & 3     pins 1 & 2     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

     W18            N/A            N/A         pins 1 & 2     pins 2 & 3
                                                closed          closed

                    SRAM CONFIGURATION

     Size          Cache        Locations         TAG

     32KB        (4) 8K x 8       Bank 0      (4) 16K x 4

     64KB        (8) 8K x 8    Banks 0 & 1    (4) 16K x 4

     128KB      (4) 32K x 8       Bank 0      (4) 16K x 4

     256KB      (8) 32K x 8    Banks 0 & 1    (4) 16K x 4

