JETPRO INFOTECH COMPANY, LTD.

MB-3A(MB-333SXA)

Processor         80386SX/CX486SLC
Processor Speed   16/20/25/33MHz
Chip Set          ALI
Max. Onboard DRAM 16MB
SRAM Cache        None
BIOS              AMI/MR
Dimensions        178mm x 218mm
I/O Options       None
NPU Options       80387SX

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                 Location

  External battery          J4        Turbo LED & Turbo    J8 pins 1 & 2
                                      switch

  Reset switch              J6        Power LED &          J8 pins 4 & 5
                                      keylock

  Speaker                   J7        Power LED &                J9
                                      keylock

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

      ADS delay enabled                         J5           pins 1 & 2
                                                              closed

      ADS delay disabled                        J5           pins 2 & 3
                                                              closed

  »   NPU mode select synchronous with         JP2           pins 1 & 2
      CPU                                                     closed

      NPU mode select asynchronous with        JP2           pins 2 & 3
      CPU                                                     closed

  »   RTC type select 146818                   JP3             open

      RTC type select 1287                     JP3            closed

  »   Monitor type select color                JP4           pins 2 & 3
                                                              closed

      Monitor type select monochrome           JP4           pins 1 & 2
                                                              closed

  »   Parity check disabled                    JP6             open

      Parity check enabled                     JP6            closed

                   CPU SPEED CONFIGURATION

      CPU Speed              JP1                  JP5

        16MHz          pins 1 & 2 closed   pins 1 & 2 closed

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

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

        33MHz          pins 2 & 3 closed   pins 2 & 3 closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

     512KB        (2) 256K x 9       NONE

      1MB         (2) 256K x 9   (2) 256K x 9

      2MB         (2) 1M x 9         NONE

      4MB         (2) 1M x 9      (2) 1M x 9

      8MB         (2) 4M x 9         NONE

      16MB        (2) 4M x 9      (2) 4M x 9