  This paper continues our work on black holes in the framework of the Regge
calculus, where the discrete version (with a certain edge length scale $b$
proportional to the Planck scale) of the classical solution emerges as an
optimal starting point for the perturbative expansion after functional
integration over the connection, with the singularity resolved.
  An interest in the present discrete Kerr-Newman type solution (with the
parameter $a \gg b$) may be to check the classical prediction that the
electromagnetic contribution to the metric and curvature on the singularity
ring is (infinitely) greater than the contribution of the
$\delta$-function-like mass distribution, no matter how small the electric
charge is.
  Here we encounter a kind of a discrete diagram technique, but with
three-dimensional (static) diagrams and with only a few diagrams, although with
modified (extended to complex coordinates) propagators.
  The metric (curvature) in the vicinity of the former singularity ring is
considered. The electromagnetic contribution does indeed have a relative factor
that is infinite at $b \to 0$, but, taking into account some existing estimates
of the upper bound on the electric charge of known substances, it is not so
large for habitual bodies and can only be significant for practically
non-rotating black holes.
