CASTLE is a new circuit code that is a hybrid between an MNA (modified nodal analysis) code such as SPICE and a transmission-line code (such as BERTHA).  It is designed for the Windows platform.
	Download the beta release of CASTLE2 here. Many new features: Several times faster for large simulations Improved ribbon-bar interface Improved drawing features And, much more!
	Download the first public release of CASTLE here. This zip file includes the executable file, help file, documentation, and some examples.
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