There are 8 RAM chips, 1 for each byte of the 64 byte wfd cycle.  The
ADC bank is in subaddresses 0x0000 to 0x7ffc; the Time bank is in
subaddresses 0x8000 to 0xfffc. If you store a 32-bit word, such as
0xDEADBEEF, the order of bytes is byte-0 = DE, byte-1 = AD, byte-2 = BE,
byte-3 = EF. Using the map below, you can figure out which chip
corresponds to which byte.
...........................................................................

               byte order map of RAM chips          
             (5C6408-15) for one WFD channel        
                                                    
                     --------------                 
          ADC bank  | byte 3  (EF) |                
                     --------------                 
                     --------------                 
                    | byte 1  (ad) |  Time bank     
                     --------------                 
                     --------------                 
          ADC bank  | byte 2  (BE) |                
                     --------------                 
                     --------------                 
                    | byte 0  (de) |  Time bank     
                     --------------                 
                     --------------                 
                    | byte 3  (ef) |  Time bank     
                     --------------                 
                     --------------                 
          ADC bank  | byte 1  (AD) |                
                     --------------                 
                     --------------                 
                    | byte 2  (be) |  Time bank     
                     --------------                 
                     --------------                 
          ADC bank  | byte 0  (DE) |                
                     --------------                 
...........................................................................

                   pin-out for RAM chip (5C6408-15) 
   
                
    Vcc  WE_  CE2   A8   A9  A11  OE_  A10 CE1_  DQ8  DQ7  DQ6  DQ5  DQ4
      |    |    |    |    |    |    |    |    |    |    |    |    |    |
   -----------------------------------------------------------------------
  |  28   27   26   25   24   23   22   21   20   19   18   17   16   15  |
  |                                                                       |
  |                                                                       |
  |                                                                       |
  |                                                                       |
  |   1    2    3    4    5    6    7    8    9   10   11   12   13   14  |
   -----------------------------------------------------------------------
      |    |    |    |    |    |    |    |    |    |    |    |    |    |
     nc  A12   A7   A6   A5   A4   A3   A2   A1   A0  DQ1  DQ2  DQ3  Vss
............................................................................