MikroSim is an educational computer program for hardware-non-specific explanation of the general functioning and behaviour of a virtual processor, running on the Microsoft Windows operating system.

The detailed documentation and the bilingual application's graphical user interface (GUI) in German and English, as well as the software's upward compatibility given to some extent by Microsoft's operating system Windows, are reasons for being a well-established, valuable e-learning tool in the field of computer engineering since 1992 for educational use.

In doing so, at this time a simulator with huge conceptual improvements arose by exploiting the novel functionality and utilisation of MS Windows’ GUI for supporting the composition of microcode and the traceability of its instructional influence.

The enhancements of the e-learning tool under Windows has been supported and promoted by the Fachbereich Mathematik/Informatik of the University of Marburg by Heinz-Peter Gumm until end 1995.

MikroSim is compiled and optimized for sake of unrestricted compatibility and for widest distribution possible for MS Windows XP as a 32-bit version.

Within a micro instruction execution cycle, the CPU as well as an input / output controller is connected to an external 16 KB huge random access memory device (RAM).

A set of powerful 32-bit floating point arithmetic commands in mantissa and exponent for the basic operations and elementary analytical functions are provided, as they are realized in today's mathematical coprocessors.

Here, in the simulation with MikroSim it is ideally assumed that the execution of each supported ALU arithmetic operation requires only a distinct computing duration independent of circuit complexity realistically needed in practice.

The execution of micro instructions can be operated on various simulation levels with different temporal resolution: With various additional options, visual CPU activities can be suppressed for the benefit of increasing the processing speed when the control of the application by machine programming is put forward.

Together with MikroBAT the microcode simulator MikroSim supports the didactical introduction of teaching aspects in technical computer science from a switch-controlled calculating machine to an assembler programmable application.