Rack M114 Upper Backplane and Details
                 -------------------------------------

                                                                31-DEC-1990
                                                   Latest Rev.  9-JULY-1993


              Recall the Layout of some of the Cards Used in
                Timings Signal Generation and Distribution
         --------------------------------------------------------

         Bus Buffer Board                             COMINT Card
                                                                     TRG
      TO            TO                         CBUS           CBUS   ACQ
     MBD           MBD                           2     TSS     1     SYNC
   _____________________________              _____________________________
   ||___|  |___|  |___|  |___| |              ||___|  |___|  |___|  |___| |
   |  |      |      |      |   |              |  ^      v      ^      ^   |
   |  ^      V      ^      V   |              |  v             v      v   |
   |  |      |      |      |   |              |                           |
   |  |---<--|      |---<--|   |              |                           |
   |    TSS           C BUS    |              |  ^                 ^      |
   |                           |              |  v                 v      |
   |                           |              | ___            _________  |
   |                           |              ||   |          |         | |
   -----------------------------              -----------------------------
                                                VMX               TCC

         Front  Top  View                           Front  Top  View


            MTG Card                                   MBD Card
                                                                     BACK
            TSS                                 TSS          CBUS    PLANE
          OUTPUT          CBUS                   IN           IN     CBUS
   _____________________________              _____________________________
   ||___|  |___|  |___|  |___| |              ||___|  |___|  |___|  |___| |
   |         |             |   |              |  |             |      ^   |
   |         ^             ^   |              |  v             v      v   |
   |                       v   |              |  |              -->---+   |
   |                           |              |   ---->----->----->---+   |
   |      ^                    |              |                       ^   |
   |      |                    |              |                       v   |
   | __________                |              |                      ___  |
   ||          |               |              |                     |   | |
   -----------------------------              -----------------------------
     EXT INPUT                                                       CBUS

         Front  Top  View                           Front  Top  View


           IMLRO Card                                 CTMBD Card
                                                                     BACK
    BITS   BITS   BITS   BITS                  CBUS    TSS   LOGIC   PLANE
    0-31   32-63  64-95  96-127                 IN     IN    PROBE   CBUS
   _____________________________              _____________________________
   ||___|  |___|  |___|  |___| |              ||___|  |___|  |___|  |___| |
   |  |      |      |      |   |              |  |      |      v      ^   |
   |  v      v      v      v   |              |  v      v             v   |
   |                           |              |  |       --->----->---+   |
   |                 ^         |              |  |                    |   |
   |                 v         |              |   ---->----->----->---    |
   |                 |         |              |                           |
   |                ___        |              |                           |
   |               |   |       |              |                           |
   -----------------------------              -----------------------------
                    CBUS

         Front  Top  View                           Front  Top  View



        Layout of the Upper Backplane in Rack M114     Solder Side View
      ------------------------------------------------------------------

            J4        J3        J2        J1
      --------------------------------------------
20.   |  ==TERM==  =CB1OUT=  ==TERM==  =TS=OUT=  |   BBB "224" Tier 1 M111..112
      |  ||||||||            ||||||||            |
19.   |  ========  =CB1OUT=  ==TS=IN=  =TS=OUT=  |   BBB "200" Tier 1 M107..110
      |  ||||||||            ||||||||            |
18.   |  =CB1=IN=  =CB1OUT=  ========  =TS=OUT=  |   BBB "168" Tier 1 M103..106
      |                      ||||||||            |
17.   |  ==TERM==  =CB0OUT=  ========  =TS=OUT=  |   BBB "224" Tier 1 M111..112
      |  ||||||||            ||||||||            |
16.   |  ========  =CB0OUT=  ========  =TS=OUT=  |   BBB "200" Tier 1 M107..110
      |  ||||||||            ||||||||            |
15.   |  =CB0=IN=  =CB0OUT=  ========  =TS=OUT=  |   BBB "168" Tier 1 M103..106
      |  xxxxxxxx            ||||||||            |
14.   |  ==TERM==  =CB2OUT=  ========  =TS=OUT=  |   BBB "248"  Tier 2  M111
      |  ||||||||            ||||||||            |
13.   |  ========  =CB2OUT=  ========  =TS=OUT=  |   BBB "208"  Tier 2  M109
      |  ||||||||            |||CAL||            |
12.   |  ========  =CB2OUT=  ========  =TS=OUT=  |   BBB "176"  Tier 2  M105
      |  ||||||||            ||TRIG||            |
11.   |  =CB2=IN=  =CB2OUT=  ========  =TS=OUT=  |   BBB "152"  Tier 3  M107
      |                      |||TSS||            |
10.   |  ==TERM==  ========  =TS=OUT=  ========  |   Cal Trig MTG  CA = 53
      |  ||||||||                                |
 9.   |  ========  ========  ========  ========  |   Special I/O MTG  CA=8
      |  |SB|BUS|                                |
 8.   |  ========  ==TERM==  ========  ========  |   MBD  MBA = 105
      |  |||105||  ||||||||                      |
 7.   |  ========  ========  =TS=OUT=  ========  |   Framework MTG   CA = 35
      |            ||||||||  |||FW|||            |
 6.   |  ========  =CB2OUT=  ========  =TS=OUT=  |   BBB "104" Timing Backplane
      |  ||||||||            |||TSS||            |
 5.   |  ========  =CB2OUT=  ========  =TS=OUT=  |   BBB "56" L1.5 Fmwrk M103
      |  ||||||||            ||||||||            |
 4.   |  =CB2=IN=  =CB2OUT=  ==TS=IN=  =TS=OUT=  |   BBB "128" Framework M101
      |  ||||||||            ||||||||            |
 3.   |  ========  =CB2OUT=  ==TERM==  =TS=OUT=  |   BBB "64"  Framework M102
      |                          |||             |
 2.   |  ===TAS==  ===CB0==  ===TS===  ===CB1==  |   Pilot COMINT (CBUS 0..1)
      |                                          |
 1.   |  ========  ===CB2==  ========  ===CB3==  |   Ass't COMINT (CBUS 2..3)
      |__________________________________________|
            J4        J3        J2        J1

                 Rear "Solder Side" View

The Framework Expansion BBB card (BBA = 56) is driven by the Framework MTG.
Cable Jumpers: S1J3 to S3J4,  S2J1 to S18J4,  S2J3 to S15J4, S6J4 to S11J4,
a few signals (Read A/B, Write A/B, Latch-Shift, T&SS#6) from S2J2 to S3J2
via wire wrap.
Terminators are on:   S3J2,  S8J3,  S10J4,  S14J4,  S17J4,  S20J2,  S20J4.