Some notes on the state machine:

Inputs to the state machine are: 

    instruction

    EAE mode bit

    EAE_loop

    halt

    single step

    continue

    trigger from the front panel

outputs are: 

    current state

The EAE loop signal controls the exit from state EAE1.  The number of times EAE1 loops on itself is a function of the instruction (MUL), sometimes the word following the  instruction, (SHL, ASR, LSR), contents of AC (NMI)