Micro-Cap is available from Spectrum Software 1021 S. Wolfe Road Sunnyvale, CA 94086 Telephone (408) 738-4387 I use the student version which supports 25 nodes. This is adequate for Tesla coil modelling. I think it cost $150.00. I started using MicroCap on a DOS 386 machine. The Tesla solution took over 15 minutes to converge. On my new 100 mhz Pentium, it only takes seconds.