Turing machine simulation (was Vi macros)

[T. J. Thompson]

In article <11893 at brl-adm.ARPA>, dsill at nswc-oas.arpa (Dave Sill) writes:
> Turing machines are universal computational devices, but simulations
> of Turing Machines are not.

I would be curious to see a defence of this claim.
Consider, for example, a simulation of a Turing machine
run on a Turing machine.
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