• Specifications

3/80 motherboard

 20MHz 68030 and 68882, 68030 on-chip MMU. P4 connector for video.

 From left to right, the rear edge of the board has: a 50-pin SCSI-2 connector;
  an Ethernet connector; two serial port connectors (ports B and A from left to
  right, port B appears to be DB9 while A is DB25); a parallel port; and an
  8-pin-DIN keyboard/mouse connector.

 Connector pinouts and form factors are not known.

 The sixteen SIMM slots are arranged in four groups of four.  Electrically,
  there are four "banks," each of which is composed of one slot from each
  group:

         Back of machine (nearest SBus connectors)

  bits   -------U0606------ 0   0 --------U0604------- bits 8-15
   16-23 -------U0806------ 2   2 --------U0804-------
         -------U0703------ 1   1 --------U0701-------
         -------U0903------ 3   3 --------U0901-------

  bits   -------U0605------ 0   0 --------U0603------- bits 0-7
   24-31 -------U0805------ 2   2 --------U0803-------
         -------U0702------ 1   1 --------U0700-------
         -------U0902------ 3   3 --------U0900-------

         Front of machine (nearest disk connectors)

 Banks must be filled in order (0 through 3), and SIMM sizes (1M or 4M) must
  not be mixed with in a bank.  Only 1M SIMMs (501-1408) are officially
  documented; 4M SIMMs can be used with boot PROM version 3.0.2 and later.

 There are a variety of jumpers.  All locations are given with component side
  up and connector side toward you.

 J020 (3-pin jumper in middle right edge, pin 1 to left)

  1-2    20MHz FPU clock                                 JUMPED
  2-3    40MHz FPU clock                                 UNJUMPED

 J043 (3-pin jumper in near middle, by serial port A, pin 1 nearest)

  1-2    RS-423 (-5V)                                    UNJUMPED
  2-3    RS-232 (-12V)                                   JUMPED

 J044 (3-pin jumper in near middle, by serial port A, pin 1 farthest)

  1-2    RS-232 (+12V)                                   JUMPED
  2-3    RS-423 (+5V)                                    UNJUMPED

 J045 (3-pin jumper in near right corner, pin 1 farthest)

  1-2    Mouse TD enabled                                UNJUMPED
  2-3    Mouse TD grounded                               JUMPED

 J1000 (single jumper in middle, near SIMMs)

  Jump to enable watchdog reset (test only)              UNJUMPED

 J1804 (block in near left corner, pin 1 to left)

  Unknown.

 Additional features of interest: the boot PROM is in the near right, at
  location U0204 (grid J3 C0).  The NVRAM is also in the near right, at
  location U0205 (grid J7 B3).  The SCSI fuse F1400 (see below) is in the near
  left corner, beside the Ethernet fuse F1500.  The keyboard fuse F0400 is in
  the near right corner.  The power supply connector, the floppy control/data
  connector, and the floppy power connector are in the far left corner.  Near
  the far edge are (from left to right) the LED/speaker connector, and two
  pairs of disk control/data (SCSI) and disk power connectors.  The P4
  connector is in the far right.

 Note that pin 38 of the SCSI port is fused (F1400) with a 1.5A fuse,
  P/N 150-1383.  The Ethernet and keyboard fuses (F1500 and F0400) are 2A,
  P/N 150-1174.

 Note that 501-1401-07 and earlier boards do not meet the P4 bus specification.
  CPU boards 501-1401-10 and later and 501-1650 have FCC-A approval.

 "Use SCSI terminator 150-1537."

 Power requirements are +5V @ 4.6A.

  

   Last modified: 2000.10.29.15.07.06 CST
     Server time: 2008.08.21.20.12.03 GMT