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501-1102



8M VME 3/2xx,3/4xx,4/2xx

 Eight megabytes of ECC memory consisting of 256K x 1-bit chips, with onboard
  refresh control.

 All locations are with component side up and the VME connectors away from you.

 There is a socket for a 220/270-ohm terminator pack 120-1613 at location F34
  (U1203).  Whether this terminator is installed depends on the machine the
  board is in, and the board's location.

 For a 3/2xx, the first memory board must be in VME slot 6 and must have the
  terminator pack installed.  "Remove the terminator when expansion memory
  boards are installed in slots 2, 3, 4, and 5" -- which is impossible because
  only four boards are supported, with the other three boards being in slots
  2-4.  Memory boards not in slot 6 should not have the terminator pack
  installed.

 For a 3/4xx or 4/2xx, the memory board in VME slot 1 should always have the
  terminator pack installed.  If there are memory boards on both sides of the
  CPU, remove the terminator at U1411 on the 3/4xx CPU and install a terminator
  pack on the memory board in slot 7.

 There are four jumpers.

 J0101   (block in far left corner)

  1-2   external clock                                  UNJUMPED
  3-4   ???                                             UNJUMPED

 J1101   Disable refresh (single jumper in far left)    UNJUMPED

 J0301   probably not present

 J0302   near left corner (accessible through top of back edge, position 0 at
  bottom)

  0     first memory board
  1     second memory board
  2     third memory board
  3     fourth memory board

 There are five LEDs on the upper rear edge of the board.  In normal operation,
  only the two green LEDs should be lit.

  UE      Uncorrectable error (when lit)          RED

  CE      Correctable error (when lit)            YELLOW

  DIS     CPU access disabled (when lit)          YELLOW

  CPU     CPU accessing memory                    GREEN
   This LED flickers because it is only lit when the CPU is actually accessing
    the memory on the board.  If the LED is not flickering, that simply means
    you have more memory than you need at the moment -- the board is not being
    accessed significantly.

  REF     Refresh OK (when lit)                   GREEN
   If this LED is not lit, refresh has failed and the board should be repaired
    or replaced.

 Note that this board must be 501-1102-11 or later to use with the 3/4xx, the
  FPA, or the FPA+.

 Power requirements are 5V @ 12.3A.

  




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