COMPUTREND SYSTEMS, INC.

CONTAQ SINGLE CHIP 486 (MS-4123 Ver. 1.1)

Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed   20/25/33/50(internal)/50/66(internal)
Chip Set          CONTAQ
Max. Onboard DRAM 32MB
SRAM Cache        64/128/256KB
BIOS              AMI
Dimensions        250mm x 220mm
I/O Options       32-bit VESA card slots (2), auxiliary keyboard connector
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  Auxiliary keyboard          J2        Turbo switch          J5/15 - 17

  Power LED & keylock      J5/1 - 5     Turbo LED              J5/12 &13

  Speaker                 J5/7 - 10     External battery          J4

  Reset switch            J5/19 & 20    32-bit VESA card        S1 & S2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select monochrome           JP1             Open

      Monitor type select color                JP1            Closed

      CPU speed select 20/25MHz                JP3           pins 2 & 3
                                                              closed
                                              JP13
                                                               open

      CPU speed select 33MHz                   JP3           pins 1 & 2
                                                              closed
                                              JP13
                                                               open

      CPU speed select > 33MHz                 JP3           pins 1 & 2
                                                              closed
                                              JP13
                                                              closed

  »   Battery select internal                  J4            pins 2 & 3
                                                              closed

      Battery select external                  J4             Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      5MB         (4) 1M x 9     (4) 256K x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      17MB        (4) 256K x 9    (4) 4M x 9

      17MB        (4) 4M x 9     (4) 256K x 9

      20MB        (4) 1M x 9      (4) 4M x 9

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                         CPU JUMPER CONFIGURATION

                 CPU                                 JP6

              80486DX2                pins 1 & 2, 4 & 5, 8 & 9, 11 & 12

              ODP486SX                pins 1 & 2, 4 & 5, 7 & 8, 10 & 11

               80486DX                pins 1 & 2, 4 & 5, 8 & 9, 11 & 12

               80487SX                pins 1 & 2, 4 & 5, 7 & 8, 10 & 11

               80486SX                pins 2 & 5, 3 & 6, 8 & 11, 9 & 12

                            SRAM CONFIGURATION

   Size     Cache SRAM      Location        TAG              JP2

   64KB     (8) 8K x 8    Banks 0 & 1     (1) 8K x   pins 1 & 2, 4 & 5, 7
                                             8         & 8, and 10 & 11

   128KB    (4) 32K x 8      Bank 0       (1) 8K x   pins 1 & 2, 4 & 5, 8
                                             8         & 9, and 11 & 12

   256KB    (8) 32K x 8   Banks 0 & 1     (1) 32K x  pins 2 & 3, 5 & 6, 8
                                             8         & 9, and 11 & 12