  We extend the notion of the compressed zero-divisor graph $\varTheta(R)$ to
noncommutative rings in a way that still induces a product preserving functor
$\varTheta$ from the category of finite unital rings to the category of
directed graphs. For a finite field $F$, we investigate the properties of
$\varTheta(M_n(F))$, the graph of the matrix ring over $F$, and give a purely
graph-theoretic characterization of this graph when $n \neq 3$. For $n \neq 2$
we prove that every graph automorphism of $\varTheta(M_n(F))$ is induced by a
ring automorphism of $M_n(F)$. We also show that for finite unital rings $R$
and $S$, where $S$ is semisimple and has no homomorphic image isomorphic to a
field, if $\varTheta(R) \cong \varTheta(S)$, then $R \cong S$. In particular,
this holds if $S=M_n(F)$ with $n \neq 1$.
