PDP-11 Addressing Modes

[Ed G.]

The first line of chapter on addressing modes in the *processor
handbook* states:

"In the PDP-11 family, all operand addressing is accomplished through
the eight general purpose registers."

If I understand correctly, even things like immediate operands and
addresses are represented as an addressing mode of a register, namely
the PC.  I think this is quite cool.

What do people here on the list think of the flexibility and 
generality of the PDP-11's addressing modes?  Is this a well thought
out architecture in your view?  How are the PDP-11's addressing modes
better or worse than those of other processors, past and present?

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