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• Specifications

386i/250 motherboard

 25MHz 80386 and 80387, 80386 on-board MMU. Four 32-bit proprietary slots, four
  ISA bus slots (three 16-bit/AT, one 8-bit/XT).

 From left to right, with component side up and connectors AWAY from you, the
  connector edge has: a male DB25 serial connector; a parallel port connector;
  eight LEDs (bit 0 to the left); and a female DB15 AUI Ethernet connector.

 There is a set of three jumpers near to 80387 in the near right, with jumper 0
  farthest away:

   0       1       2        mode
  ----    ----    ----     --------------------------------
   UN      UN      UN      Normal. Self-test is executed.  Memory tested is
                            determined by the NVRAM setting.
   JU      UN      UN      Diagnostic. Self-test is executed.  All memory is
                            tested.  Status sent to the serial port until all
                            video hardware tests OK.
   UN      UN      JU      Manufacturing. Diagnostic mode continuous loop.
   JU      UN      JU      Bypass. Bypasses most of normal self-test.

 Additional features of interest: in the far left beyond the ISA slots are five
  voltage test points (+5, GND, +12, -12, and -5 from left to right).  In the
  far center are the boot PROM at location U602, the time-of-day/NVRAM chip at
  U603, and the IDPROM at U601.  Next to the IDPROM is the SCSI connector, with
  pin 1 in the far left.  In line but nearer is the floppy data/control
  connector, with pin 1 in the near right.  The power supply connector is along
  the right edge just beyond the jag in the edge.  Along the jag is the
  floppy/disk power connector (four pins, pin 1 at right), and somewhat nearer
  are the fan power connector (two pins, pin 1 at left) and the front panel LED
  power connector (three pins, pin 1 farthest).  In the near left corner is the
  speaker connector (three pins, pin 1 farthest).  The Ethernet fuse is near
  the serial and parallel connectors, and the SCSI fuse is near the SCSI
  connector.  Both fuses are 1A subminiature fuses, P/N 140-1027.

 Note that boot PROM version 4.3 or later is required to use the GXi color
  framebuffer 501-1352.  Boot PROM version 4.4 or later is required to use
  monochrome framebuffer 501-1433/1568.

 Note that the Ethernet is permanently set for type-2 (transformer-coupled)
  transceivers.

 Power requirements are +5V @ 5.8A.

  

   Last modified: 2000.10.29.14.33.58 CST
     Server time: 2008.12.06.05.26.11 GMT