
JETPRO INFOTECH COMPANY, LTD.

MB-4F3(MB-450C4FV)

Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed   20/25/33/50(internal)/50/66(internal)MHz
Chip Set          FOREX
Max. Onboard DRAM 32MB
SRAM Cache        64/128/256KB
BIOS              AMI/AWARD
Dimensions        254mm x 218mm
I/O Options       32-bit VESA local bus slots (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery            JP2       Turbo switch              JP15

  Reset switch                JP3       Turbo LED                 JP16

  Power LED & keylock         JP9       32-bit VESA card (2)     S1 & S2

  Speaker                     JP10

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     Battery select internal                 JP2           pins 2 & 3
                                                              closed

      Battery select external                 JP2           connected

     Factory configured - do not             JP5             closed
      alter

     CMOS memory normal operation            JP6              open

      CMOS memory clear                       JP6             closed

              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 SPEED CONFIGURATION

     CPU speed        JP7A      JP7B       JP7C       JP102       JP103

  66MHz(internal)   pins 1 &    pins 1   pins 2 &    pins 1 &    pins 1 &
                       2         & 2        3           2           2

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

  50MHz(internal)   pins 1 &    pins 2   pins 1 &    pins 1 &    pins 1 &
                       2         & 3        2           2           2

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

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

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

  Note:JP102 controls VESA Bus wait states. JP103 controls VESA bus speed

                          CPU TYPE CONFIGURATION

      CPU Type           JP12         JP13          JP29         JP30

      80486DX2        pins 1 & 2    pins 1 & 2   pins 1 & 2    pins 1 & 2
                        closed       closed        closed       closed

   80486DX2(PQFP)     pins 2 & 3    pins 2 & 3   pins 2 & 3    pins 2 & 3
                        closed       closed        closed       closed

      ODP486SX        pins 1 & 2    pins 1 & 2   pins 2 & 3    pins 2 & 3
                        closed       closed        closed       closed

   80486DX(PQFP)      pins 2 & 3    pins 2 & 3   pins 2 & 3    pins 2 & 3
                        closed       closed        closed       closed

    80486DX(PGA)      pins 1 & 2    pins 1 & 2   pins 1 & 2    pins 1 & 2
                        closed       closed        closed       closed

      80487SX         pins 1 & 2    pins 1 & 2   pins 2 & 3    pins 2 & 3
                        closed       closed        closed       closed

   80486SX(PQFP)      pins 2 & 3    pins 2 & 3   pins 2 & 3    pins 2 & 3
                        closed       closed        closed       closed

                    SRAM CONFIGURATION

     Size        Cache SRAM      Location         TAG

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

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8

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

                         SRAM JUMPER CONFIGURATION

    Size          JP8A            JP8B           JP8D           JP8E

    64KB        pins 2 & 3     pins 2 & 3     pins 2 & 3      pins 2 & 3
                 closed          closed         closed         closed

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

    256KB       pins 2 & 3     pins 1 & 2     pins 2 & 3      pins 1 & 2
                 closed          closed         closed         closed

