F4 CPU Rack

I/O and CPU cards MUPAC triple-high ww cards
Mem cards PC

      +---------------------- I/O --------------------------+
      | C             L                                     | 
      | C             P                                     |
      | 4             T                                     |
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      +-------------- CPU ---------------+------- MEM ------+
      |                                  |                  | 
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      +----------------------- MEM ------+------------------+
      |                                                     |
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      +-----------------------------------------------------+