Very interesting. I have supposed this since using PDP-11 assembler and reading Dennis&#x27; compiler in the late 70&#x27;s.<p>There were machines with auto increment modes long before the PDP-11 though, e.g. &quot;<a href="http:&#x2F;&#x2F;ed-thelen.org&#x2F;comp-hist&#x2F;GE-635.html#Indirect" rel="nofollow">http:&#x2F;&#x2F;ed-thelen.org&#x2F;comp-hist&#x2F;GE-635.html#Indirect</a> Then Tally (IT) Modification&quot;