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Symbolic simulation is a promising formal verification technique combining the flexibility of conventional simulation with powerful symbolic methods. Unfortunately, existing symbolic simulators are restricted to gate level simulation or handle just a synthesizable subset of an HDL. Simulation of systems composed of design, testbench and correctness checkers, however, requires the complete set of HDL constructs. We present an approach that enables symbolic simulation of the complete set of RT-level Verilog constructs with full delay support. Additionally, we propose a flexible scheme for introducing symbolic variables and demonstrate how error traces can be simulated with this new scheme. Finally, we present some experimental results on an 8051 micro-controller design which prove the effectiveness of our approach.