UNIDENTIFIED

YL-A09

Processor         80286
Processor Speed   16MHz
Chip Set          C & T Neat
Max. Onboard DRAM 8MB
Cache             None
BIOS              AMI
Dimensions        330mm x 259mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J3       Turbo LED                  JP13

  Speaker                    JP11      Turbo Switch               JP14

  Reset switch               JP12      Power LED & keylock        JP16

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not alter        JP2            closed

  »   NPU mode select synchronous with         JP3           pins 1 & 2
      CPU                                                     closed

      NPU mode select synchronous with         JP3           pins 2 & 3
      oscillator installed at Y1                              closed

  »   CPU speed select fast                   JP14            closed

      CPU speed select slow                   JP14             open

  »   BIOS type select 27256                  JP15           pins 2 & 3
                                                              closed

      BIOS type select 27128                  JP15           pins 1 & 2
                                                              closed

  »   Parity check enabled                    JP17           pins 1 & 2
                                                              closed

      Parity check disabled                   JP17           pins 2 & 3
                                                              closed

  »   Quiet bus enabled                       JP20           pins 1 & 2
                                                              closed

      Quiet bus disabled (Use for high        JP20           pins 2 & 3
      speed I/O cards)                                        closed

  »   Same type of memory is used in          JP23           pins 1 & 2
      all four banks                                          closed

      First two banks are different           JP23           pins 2 & 3
      than last two banks of memory                           closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

    512KB        (18) 41256        NONE           NONE           NONE

     1MB         (18) 41256     (18) 41256        NONE           NONE

    1.5MB        (18) 41256     (18) 41256      (2) 256K x       NONE
                                                    9

     2MB         (18) 41256     (18) 41256      (2) 256K x    (2) 256K x
                                                    9             9

     2MB        (18) 411000        NONE           NONE           NONE

     4MB        (18) 411000     (18) 411000       NONE           NONE

     6MB        (18) 411000     (18) 411000    (2) 1M x 9        NONE

     8MB        (18) 411000     (18) 411000    (2) 1M x 9     (2) 1M x 9

                  DRAM JUMPER CONFIGURATION

  Size     JP7      JP8      JP9     JP10     JP17     JP23

  512KB    Open    2 & 3    Open     Open    1 & 2    1 & 2

   1MB     Open    2 & 3    Open      2-3    1 & 2    1 & 2

  1.5MB   1 & 2    2 & 3    Open      2-3    1 & 2    1 & 2

   2MB    1 & 2    2 & 3    1 & 2     2-3    1 & 2    1 & 2

   2MB     Open    2 & 3    Open     Open    1 & 2    1 & 2

   4MB     Open    2 & 3    Open      2-3    1 & 2    1 & 2

   6MB    1 & 2    2 & 3    Open      2-3    1 & 2    1 & 2

   8MB    1 & 2    2 & 3    1 & 2     2-3    1 & 2    1 & 2

  Note:Pins designated should be in the closed position.

      DRAM SWITCH CONFIGURATION

  Size     SW1/3    SW1/4    SW1/5

  512KB     Off      Off      Off

   1MB      On       Off      Off

  1.5MB     Off       On      Off

   2MB      On        On      Off

   2MB      Off      Off       On

   4MB      On       Off       On

   6MB      Off       On       On

   8MB      On        On       On

                             I/O CONFIGURATION

            Setting                 JP1A          JP1B           JP1C

    I/O at full speed during        Open         Closed          Open
     memory refresh cycle

    I/O at full speed during       Closed         Open           Open
  memory refresh cycle and DMA

       I/O at full speed           Closed        Closed         Closed