DT56    #MAC  JV7900
 DTJQ     MODD LDX   0  JK52F,%A,CPPTR(2)   [CHECK IF 7900 IS NOT ONLINEABLE 
 DW4B          ANDN  0  #20                 [IE JK52F.B19 = 0
 DWJ2          BZE   0  %B                  [NOT ONLINEABLE : MUST BE A V7900
 DX3L    #NOR