
UNIDENTIFIED

HT12HS

Processor         80286
Processor Speed   12/16/20MHz
Chip Set          VLSI
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI/Eurosoft/Quadtel
Dimensions        220mm x 220mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  Auxiliary keyboard          JP1       Turbo switch             JP10
  connector

  External battery            JP2       Reset switch             JP11

  Speaker                     JP8       Power LED & keylock      JP12

  Turbo LED                   JP9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

      Monitor type select color               JP3             Closed

      Monitor type select monochrome          JP3              Open

      CMOS memory normal operation            JP4             Closed

      CMOS memory clear                       JP4              Open

      BIOS type select 27256                  JP5           pins 2 & 3
                                                              closed

      BIOS type select 27128                  JP5           pins 1 & 2
                                                              closed

      NPU speed select 4.77MHz                JP6           pins 1 & 2
                                                              closed

      NPU speed select 10.6MHz                JP6           pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

   Size     Bank 0       P 0       Bank 1        P 1       Bank   Bank 1A
                                                           0A

  512KB       (4)         (2)       NONE        NONE      NONE     NONE
             44256      41256

  640KB       (4)         (2)      (4) 4464    (2) 4164   NONE     NONE
             44256      41256

   1MB        (4)         (2)        (4)         (2)      NONE     NONE
             44256      41256       44256       41256

   2MB       NONE        NONE       NONE        NONE       (2)     NONE
                                                           1M x
                                                            9

   4MB        (4)         (2)        (4)         (2)      NONE     NONE
            441000      411000     441000      411000

   4MB       NONE        NONE       NONE        NONE       (2)     (2) 1M
                                                           1M x     x 9
                                                            9

                    CPU SPEED CONFIGURATION

  System clock     Bus clock      DRAM speed         JP7

     12MHz        8MHz asynch        100ns           Open

     12MHz        6MHz synch         100ns          Closed

     16MHz        8MHz synch         80ns           Closed

     20MHz        8MHz asynch       60/70ns          Open

     20MHz        10MHz synch       60/70ns         Closed

          MISCELLANEOUS TECHNICAL NOTE

  Note: The location of pin 1 is unidentified.

