2366 ULM
--------

  I/O A 1-6   hex bits
        7-8   SCF sec bits 0,1

  I/O B 1-2   SCF T.2 sec bits 0,1
        3-10  VSN 0-7
        11-14 SA 0-3
        15    delayed level 0 for L1.2
        16    clear
        17    MLU done

  I/O C 1     fail
        2     done
        3-5   not labeled; goes to MLU input
        6-16  not labeled; goes to ECL-->NIM converter
        17    not labeled; goes to "enable" of MLU

  I/O D       FERA data to L1.2

2372 MLU
--------

  Output 0-3   SA 0-3
  Input  0-4   STLAY 0-4
         5-6   SCF sec bits 0-1
         7-9   SCF Hex bits 0-2
         10-12 input from ULM (daisy-chained to the other 2372)
  Ready        MLU done

2372 MLU
--------

  Output 0-7   VSN 0-7
  Input  0-12  Same as other unit