ADVANCED COMPUTER TECHNOLOGY, LTD.

LAT-25/4M, LAT-16/4M, LAT-12/4M

Processor         80286
Processor Speed   12/16/25MHz
Chip Set          ACT
Max. Onboard DRAM 4MB
Cache             None
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Turbo LED                   JP2      External battery           JP11

  Power LED & Keylock         JP7      Speaker                    JP14

  Reset switch               JP10      Turbo switch               JP19

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Factory configured - do not            JP4                N/A
      alter

  »   BIOS type select 27256                 JP6             pins 1 & 2
                                                               closed

      ROM type select 27512                  JP6             pins 2 & 3
                                                               closed

  »   Factory configured - do not            JP8                N/A
      alter

  »   Monitor type select color              JP9             pins 2 & 3
                                                               closed

      Monitor type select                    JP9             pins 1 & 2
      monochrome                                               closed

  »   Battery select internal               JP12             pins 2 & 3
                                                               closed

      Battery select external               JP12             pins 1 & 2
                                                               closed

  »   Power good signal detect              JP13             pins 1 & 2
      from power supply                                        closed

      Power good signal detect              JP13             pins 2 & 3
      from board                                               closed

  »   Factory configured - do not           JP15                N/A
      alter

  »   Factory configured - do not           JP16                N/A
      alter

  »   Bus speed select 8MHz                 JP17             pins 1 & 2
                                                               closed

      Bus speed select 6MHz                 JP17             pins 2 & 3
                                                               closed

  »   Factory configured - do not           JP18                N/A
      alter

  »   Parity check enabled                  JP20             pins 1 & 2
                                                               closed

      Parity check disabled                 JP20             pins 2 & 3
                                                               closed

  »   Factory configured - do not           JP21                N/A
      alter

  »   Factory configured - do not           JP22                N/A
      alter

  »   RAM speed select 0 wait               SW1/4               Off
      states

      RAM speed select 1 wait               SW1/4                On
      state

  Note:SW1/4 must be on for the LAT-25/4M model.

                            DRAM CONFIGURATION

   Size     Bank 0     Bank 1     Bank 2    Bank 3      P-0        P-1

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

  512KB      NONE       NONE        (2)      NONE      NONE        NONE
                                  256K x
                                    9

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

  640KB      NONE      (4) 4464     (2)      NONE      NONE      (2) 4164
                                  256K x
                                    9

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

   1MB        (4)       NONE       NONE       (2)       (2)        NONE
             44256                          256K x     41256
                                              9

   1MB       NONE       NONE        (2)       (2)      NONE        NONE
                                  256K x    256K x
                                    9         9

   2MB       NONE       NONE        (2)      NONE      NONE        NONE
                                  1MBx 9

   4MB       NONE       NONE        (2)       (2)      NONE        NONE
                                  1MBx 9    1MBx 9

           DRAM SWITCH CONFIGURATION

  Size      SW1/1        SW1/2        SW1/3

  512KB       On           On           On

  640KB       On          Off          Off

   1MB        On          Off           On

   2MB       Off           On           On

   4MB       Off          Off           On