H135712 - 8640/8641 MCA PROCESSOR PLANAR JUMPER SETTINGS
 
 TEXT:
 For the PC Server 320 MicroChannel (MCA) Systems, there are two
 System board FRUs:
 FRU p/n96G1340 supports 75MHz and 90MHz only.
 FRU p/n96G3694 supports 75MHz, 90MHz, 100MHz, and 133MHz.
 
 For the PC Server 520 MicroChannel (MCA) Systems, there is one
 System board FRU:
 FRU p/n96G2648 supports 75MHz, 90MHz, 100MHz, and 133MHz.
 
 In addition there are two versions of 96G3694 and 96G2648:
 Original planar (Level D & E):  No J1, J12 (2-pin), J43 (6-pin).
 New planar (Level G):      J1 (3-pin), J12 (3-pin), J43 (6-pin).
 
 On the new planar (Level G), a new jumper J1 (3-pin) was added
 AND J12 was changed from a 2-pin to a 3-pin jumper.
 Jumpers J1, J12 and J43 control the processor speed.
 
 J1 (new planar) is located to the left of the processor and J12.
 J12 is located to the left of the processor.
 J43 is located a little less than halfway down the system board
 beneath the processors.  It has three double jumpers (6-pins)
 corresponding to each oscillator located right beneath the
 processors.  The three oscillators from left to right are 50,
 60, and 66 MHz.  When you jumper the pins, you are grounding
 its corresponding oscillator thus disabling it.
 
 Below are diagrams indicating the pin orientation and numbering
 scheme with respect to the edge of the planar.  Refer to the
 diagram on the system frame or door for additional information.
 
        (Original)                         (New)
 Edge of Level D & E Planar        Edge of Level G Planar
 ____________________________    _______________________________
 
     1 . . 2                         1 . . 2
     3 . . 4                         3 . . 4
     5 . . 6                         5 . . 6
      (J43)                           (J43)
 
                        1 .                     1 .     1 .
                        2 .                     2 .     2 .
                       (J12)                    3 .     3 .
                                               (J1)    (J12)
 
 
  --------------------------------------------------------------
 
             (Original)      (Original)          (New)
              Level D         Level E           Level G
  ______________________________________________________________
 |         | 96G1340 (320)|     N/A        |     N/A            |
 |   FRU   |    N/A       |  96G3694 (320) |  96G3694 (320)     |
 |         | 96G2648 (520)|  96G2648 (520) |  96G2648 (520)     |
 |_________|______________|________________|____________________|
 |  Jumper |              |                |                    |
 |________ | J12     J43  |  J12     J43   | J1     J12    J43  |
 |         |2-pin   6-pin | 2-pin   6-pin  |3-pin  3-pin  6-pin |
 |Processor|              |                |                    |
 |_________|______________|________________|____________________|
 |50/75MHz |open   3-4,5-6| open   3-4,5-6 | 1-2   1-2   3-4,5-6|
 |_________|______________|________________|____________________|
 |60/90MHz |open   1-2,5-6| open   1-2,5-6 | 1-2   1-2   1-2,5-6|
 |         |  (320 only)  |                |                    |
 |_________|______________|________________|____________________|
 |66/100MHz|open  1-2,3-4 | open   1-2,3-4 | 1-2   1-2   1-2,3-4|
 |         |  (520 only)  |                |                    |
 |_________|______________|________________|____________________|
 |66/133MHz|NOT Supported | 1-2    1-2,3-4 | 1-2   2-3   1-2,3-4|
 |         |              |                |                    |
 |_________|______________|________________|____________________|
 
 
 December 13, 1996