MONOLITHIC SYSTEMS, INC. (COLORADO MSI)

MICROFRAME 486M


Processor         80486DX
Processor Speed   25MHz
Chip Set          C & T
Max. Onboard DRAM 8MB
Cache             None
BIOS              Quadtel
Dimensions        330.2mm x 221mm
I/O Options       32-bit external memory card slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  External battery          J1         Turbo LED                 J10

  Drive active LED          J3         CPU ready LED             J11

  Front panel ribbon        J6         Speaker                   J19
  cable

  Reset switch              J7         Power LED & keylock       J40

  Auxiliary keyboard        J8         32-bit external           S1
                                       memory card

  Note:If the front panel Drive LED is to be used, the drive active
  signal from the drive or drive controller

  must be connected to J3/pins 1 & 2 or J3/pins 2 & 3.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             J2              Open

      CMOS memory clear                        J2             Closed

  »   DMA active signal select high            J12            Closed

      DMA active signal select low             J12             Open

  »   NPU parity check enabled                 J13            Closed

      NPU parity check disabled                J13             Open

  »   Internal CPU cache enabled               J16            Closed

      Internal CPU cache disabled              J16             Open

  »   NPU zero wait state enabled              J17            Closed

      NPU zero wait state disabled             J17             Open

  »   Internal CPU caching of BIOS             J18        pins 1 & 2 open
      disabled

      Internal CPU caching of BIOS             J18           pins 1 & 2
      enabled                                                 closed

      Í Factory test jumper- do not            J24            Closed
      alter

  »   POST enabled                             J25            Closed

      POST disabled                            J25             Open

  »   Factory test jumper - do not             J26            Closed
      alter

  »   NPU disabled                             J33             Open

      NPU enabled                              J33            Closed

  »   Factory test jumper - do not             J34            Closed
      alter

  »   Factory test jumper - do not             J35            Closed
      alter

  »   Factory test jumper - do not             J36            Closed
      alter

  »   Monitor type select color                J39           pins 2 & 3
                                                              closed

      Monitor type select monochrome           J39           pins 1 & 2
                                                              closed

  Note:Locations of J18, J34, J35, & J36 are unknown.

              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

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

  J6 - RIBBON CABLE CONNECTOR

        PIN ASSIGNMENTS

  [Image]