Spectrum Software
Industrial Strength Simulation




Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.




Questions and Answers - Winter 2015


Question: I recently downloaded a model from a major manufacturer and I'm having trouble getting it to work. I installed it in the way your manual describes and all went well. But then I tried running a circuit with the part in it and I get the following message.

Unknown command.


Answer: The problem is that the file is encrypted. $CDENSTART defines the point at which encryption starts. Only the headers are left in readable text. The crucial part of the file, the SPICE netlist describing the model, is encrypted so that only PSPICE can read it. The purpose of the encryption is said to be protection of the proprietary content of the model, but it also prevents Micro-Cap or any other simulator but PSPICE from reading it. We recommend that you ask the manufacturer for an unencrypted model. Often they will do this if you sign a non-disclosure agreement.

Question: I am trying to use Micro-Cap 11 in a computer with Windows 8 but the 64 bit version is not able to run. I have tried with Windows 7 compatibility settings but it still does not work.

Answer: The problem is in the MC11 code that detects the number of processors in your system. If you have 16 or more processors, then MC11 versions up to and including MC11.0.0.8 will not properly run the 64 bit version, although the 32 bit version runs fine.

MC11.0.0.9 corrects the problem. You can download the updated 64 bit version (mc11_64.exe) and also the updated 32 bit version (mc11.exe) directly from the Help menu or you can download it from the web site Users Section.

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