
INTERCOMP, INC.

486 PERSONAL WORKSTATION

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2/80586SX
Processor Speed  20/25/33/50(Internal)/50/66(Internal)MHz
Chip Set         Intercomp/OPTI
Max. onboard DRAM64MB
SRAM Cache       64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (2), 10 base T ethernet

                 floppy drive interface, IDE interface, parallel port

                 serial port (2), VGA port, VGA feature connector
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  External battery          P5         VGA feature              P21
                                       connector

  Serial port (COM2)        P7         Keylock                  P31A

  Serial port (COM1)        P8         Speaker                  P31B

  IDE interface             P9         IDE interface LED        P31D

  Parallel port             P10        Turbo LED                P31E

  Floppy drive              P11        Turbo Switch             P31F
  interface

  10 base T ethernet        P18        Reset                    P31G

  VGA Port                  P20        32-bit VESA local      S1 & S2
                                       bus slots

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper            Position

     CMOS memory normal operation         P3                Open

      CMOS memory clear                    P3               Closed

     VESA bus enabled                    P13        Pins 1 & 2, 3 & 5, 4
                                                          & 6 closed

      VESA bus disabled                   P13        Pins 1 & 2, 5 & 7, 6
                                                          & 8 closed

     IDE select single mode              P19         Pins 1 & 2 closed

      IDE select master/slave mode        P19          Pins 1 & 2 open

     LPT select output mode              P19         Pins 3 & 4 closed

      LPT select input/output mode        P19         Pins 3 & 4 closed

     Factory configured do not           P22         Pins 2 & 3 closed
      alter

     VESA bus VGA controller             P23         Pins 2 & 3 closed
      enabled

      VESA bus VGA controller             P23         Pins 1 & 2 closed
      disabled

     Factory configured do not           P24         Pins 2 & 3 closed
      alter

     Factory configured do not           P25         Pins 1 & 2 closed
      alter

     Factory configured do not           P26         Pins 2 & 3 closed
      alter

     Monitor type select color           P31C               Open

      Monitor type select                 P31C              Closed
      monochrome

  Note: VESA bus should be disabled for 50MHz CPU speed operation.

             VESA WAIT STATE (ID2) CONFIGURATION

     Wait states          CPU speed            P14 (ID2)

    0 wait states           33MHz          Pins 1 & 2 open

    1 wait state           > 33MHz         Pins 1 & 2 closed

    VESA BUS SPEED (ID3) CONFIGURATION

      CPU speed           P14 (ID3)

        33MHz         Pins 3 & 4 open

       > 33MHz        Pins 3 & 4 closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9      NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9      NONE           NONE

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

     4MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9  (4) 256K x 9

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

     5MB        (4) 256K x 9   (4) 1M x 9        NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9   (4) 1M x 9        NONE

     7MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9   (4) 1M x 9

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     9MB        (4) 256K x 9   (4) 1M x 9     (4) 1M x 9        NONE

     10MB       (4) 256K x 9   (4) 256K x 9   (4) 1M x 9     (4) 1M x 9

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     13MB       (4) 256K x 9   (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9        NONE           NONE           NONE

     17MB       (4) 256K x 9   (4) 4M x 9        NONE           NONE

     18MB       (4) 256K x 9   (4) 256K x 9   (4) 4M x 9        NONE

     19MB       (4) 256K x 9   (4) 256K x 9   (4) 256K x 9   (4) 4M x 9

     20MB       (4) 1M x 9     (4) 4M x 9        NONE           NONE

     21MB       (4) 256K x 9   (4) 1M x 9     (4) 4M x 9        NONE

     22MB       (4) 256K x 9   (4) 256K x 9   (4) 1M x 9     (4) 4M x 9

     24MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     25MB       (4) 256K x 9   (4) 1M x 9     (4) 1M x 9     (4) 4M x 9

     28MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 4M x 9

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     33MB       (4) 256K x 9   (4) 4M x 9     (4) 4M x 9        NONE

     36MB       (4) 1M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     37MB       (4) 256K x 9   (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     40MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     48MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     49MB       (4) 256K x 9   (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

     52MB       (4) 1M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

     64MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

                    CACHE CONFIGURATION

     Size          Cache         Location         TAG

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 16K x 4

     128KB      (4) 32K x 8       Bank 0      (1) 16K x 4

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 16K x 4

                        CACHE JUMPER CONFIGURATION

               Size                                 P15

               64KB                   Pins 3 & 5, 4 & 6, 7 & 8 closed

              128KB                   Pins 1 & 3, 2 & 4, 7 & 8, 9 & 10
                                                   closed

              256KB                Pins 3 & 5, 4 & 6, 7 & 8, 9 & 10, 11 &
                                                 12 closed

                       VIDEO START UP CONFIGURATION

        Mode               P27               P28                P29

  640 x 480, 60Hz       Pins 1 & 2        Pins 1 & 2         Pins 1 & 2
                         closed             closed            closed

  640 x 480, 70Hz       Pins 2 & 3        Pins 1 & 2         Pins 1 & 2
                         closed             closed            closed

  800 x 600, 56Hz       Pins 1 & 2        Pins 1 & 2         Pins 2 & 3
                         closed             closed            closed

  800 x 600, 60Hz       Pins 1 & 2        Pins 2 & 3         Pins 1 & 2
                         closed             closed            closed

  800 x 600, 70Hz       Pins 2 & 3        Pins 2 & 3         Pins 1 & 2
                         closed             closed            closed

  1024 x 768, 43Hz      Pins 2 & 3        Pins 2 & 3         Pins 2 & 3
                         closed             closed            closed

  1024 x 768, 60Hz      Pins 1 & 2        Pins 2 & 3         Pins 2 & 3
                         closed             closed            closed

  1024 x 768, 70Hz      Pins 2 & 3        Pins 2 & 3         Pins 2 & 3
                         closed             closed            closed

                 I/O BASE ADDRESS AND BASE MEMORY ADDRESS

    I/O Address         Base Memory           P33               P34
                         Address

       300h               D8000h            Closed            Closed

       320h               CC000h             Open             Closed

       340h               D0000h            Closed             Open

       360h               D4000h             Open              Open

                     CPU TYPE AND SPEED CONFIGURATION

   CPU Type       Speed          P16             P17             P30

    80486SX       20MHz       Pins 3 & 4    Pins 3 & 5, 4     Pins 1 & 2
                                closed       & 6 closed         closed

    80486SX       25MHz          Open       Pins 3 & 5, 4     Pins 1 & 2
                                             & 6 closed         closed

    80487SX       20MHz       Pins 3 & 4    Pins 3 & 5, 4     Pins 2 & 3
                                closed       & 6 closed         closed

    80487SX       25MHz          Open       Pins 3 & 5, 4     Pins 2 & 3
                                             & 6 closed         closed

    80486DX       25MHz          Open       Pins 3 & 5, 4     Pins 2 & 3
                                             & 6 closed         closed

    80486DX       33MHz       Pins 1 & 2    Pins 3 & 5, 4     Pins 2 & 3
                                closed       & 6 closed         closed

    80486DX       50MHz          Open       Pins 1 & 3, 2     Pins 2 & 3
                                             & 4 closed         closed

   80486DX2      50i MHz         Open       Pins 3 & 5, 4     Pins 2 & 3
                                             & 6 closed         closed

   80486DX2      66i MHz      Pins 1 & 2    Pins 3 & 5, 4     Pins 2 & 3
                                closed       & 6 closed         closed

