
UNIDENTIFIED

MB-1212V

Processor         80286
Processor Speed   10/12MHz
Chip Set          VLSI
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI/Award/Phoenix
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Reset switch                JP1      Turbo switch                JP4

  Power LED & keylock         JP2      Turbo LED                   JP5

  Speaker                     JP3      External battery           JP17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Memory speed select 100ns               JP6           pins 1 & 2
                                                              closed

      Wait state select 0 wait states         JP10            Closed

      Wait state select 1 wait state          JP10             Open

      BIOS type select 27256                  JP11          pins 1 & 2
                                                              closed

      BIOS type select 27128                  JP11          pins 2 & 3
                                                              closed

      Monitor type select color               JP12          pins 1 & 2
                                                              closed

      Monitor type select monochrome          JP12          pins 2 & 3
                                                              closed

      Power good signal detect from           JP16           see note
      power supply

      Power good signal detect from           JP16           see note
      board

      Parity check enabled                    JP19          pins 1 & 2
                                                              closed

      Parity check disabled                   JP19          pins 2 & 3
                                                              closed

            Note: JP19 is an optional jumper and may not be present on
            all boards. The settings for JP16 are unidentified.

                            DRAM CONFIGURATION

    Size       Bank 0      Bank 0A      Bank 1      Bank 1A      Bank 1B

   512KB        NONE       (4) 44256     NONE         NONE        NONE

   640KB        NONE       (4) 44256     NONE         NONE      (4) 4164

   640KB        NONE       (4) 44256   (18) 4164      NONE        NONE

    1MB         NONE       (4) 44256     NONE       (4) 44256     NONE

    2MB         (18)         NONE        NONE         NONE        NONE
               41100

    4MB         (18)         NONE         (18)        NONE        NONE
               41100                     41100

  Note: See table below for parity configuration.

      DRAM PARITY CONFIGURATION

    Size         P 0          P 1

    512KB      (2) 41256     NONE

    640KB      (2) 41256     NONE

    640KB      (2) 41256     NONE

     1MB       (2) 41256   (2) 41256

     2MB         NONE        NONE

     4MB         NONE        NONE

       DRAM JUMPER CONFIGURATION

   Size      JP7       JP8       JP9

  512KB     Closed   Closed    Closed

  640KB     Closed   Closed     Open

   1MB      Closed    Open     Closed

   2MB      Closed    Open      Open

   4MB       Open    Closed    Closed

                        KEYBOARD BIOS CONFIGURATION

      Setting          JP13          JP14          JP15          JP18

   Controller on      Closed         Open          Open          Open
      pin 30

   Controller on       Open         Closed         Open          Open
      pin 23

   Controller on       Open          Open         Closed         Open
      pin 27

   Controller on       Open          Open          Open         Closed
      pin 32

