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# SIMULATION - 2

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- External tools are configured via a 'simconf' widget. This needs to be tuned for the host system. Config is then saved in a simrc file, which can be edited directly to add / remove / configure tools.
- Tools can be run in the background. Xschem optionally shows exit status, stderr and stdout messages from batch jobs without blocking.
- Multiple Simulator / viewing tools can be configured for each simulation mode (spice, VHDL, Verilog, Spectre), a radio button sets the active tool.
- Additional tools (logic synthesis, etc) can easily be added in the future.
- No information about external tools is hard coded in Xschem.