The ICARUS T600 liquid argon (LAr) time projection chamber (TPC) underwent a
major overhaul at CERN in 2016-2017 to prepare for the operation at FNAL in the
Short Baseline Neutrino (SBN) program. This included a major upgrade of the
photo-multiplier system and of the TPC wire read-out electronics. The full TPC
wire read-out electronics together with the new wire biasing and
interconnection scheme are described. The design of a new signal feed-through
flange is also a fundamental piece of this overhaul whose major feature is the
integration of all electronics components onto the signal flange. Initial
functionality tests of the full TPC electronics chain installed in the T600
detector at FNAL are also described