• Specifications

3Com 3C400 Ethernet Multibus

 This board is used in Sun-1 and Sun-2 configurations. It may be distinguished
  from the 501-1004 Sun-2 Multibus Ethernet by checking the location of the
  Ethernet cable connector, which is toward the bottom of the board.  (On the
  edge with the Multibus connectors, the larger connector is toward the top.)

 DIP switch and jumper information:

 JP1     jumper          Addressing size
 JP2     jumper
  With the board component-side up and the Multibus edge connectors facing you,
   these jumpers are in the lower left corner of the board.  They should be set
   for 20-bit memory addressing, with JP1 unjumped and JP2 jumped.

 MRDC    jumper
 MWTC    jumper
 IORC    jumper
 IOWC    jumper
  To the right of JP1 and JP2. MRDC and MWTC should be jumped.  IORC and IOWC
   should be unjumped.

 INT?    jumper          Ethernet interrupt level
  Eight-position jumper, with pairs marked INT0 through INT7.  INT3 should be
   jumped, all others unjumped.

 ADR17   DIP switch
  In the bottom right corner of the board. All switches should be set to OFF.

 ADR13   DIP switch
  Eight-position DIP switch; switches seven through one correspond to address
   bits A13 through A19 in that (reverse) order.  For the first Ethernet board,
   switches one, two, and three should be ON and all others OFF.  For the
   second Ethernet board, switches one, two, three, and seven should be ON and
   all others OFF. Switch eight should ALWAYS be OFF.

 The Ethernet address PROM is in component position I2.

 Power requirements are +5V @ 5V and +12V @ 0.5A.

  

   Last modified: 2000.10.25.19.37.56 CDT
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