SKM Systems Analysis, Inc.
They originally developed the DAPPER power system analysis software on a mainframe at the UCLA Computer Center. By 1978, DAPPER was running in time-share mode on the Control Data Corporation mainframe, and being used by engineers both in the United States and internationally.
The first PC version of DAPPER was released in 1981, followed in 1983 by the CAPTOR time current coordination software. A_FAULT was developed in 1988 and IEC_FAULT in 1991, to provide ANSI and IEC-909 fault calculations, respectively. The dynamic simulation program I*SIM and the harmonic analysis program HI_WAVE filled out the DOS-based product line in 1992.
In 1995, SKM released Power*Tools for Windows (PTW). The PTW line of software offers the same powerful studies that have been available in DOS, but adds greater flexibility, enhanced ease of use, and graphical functions not available in DOS. PTW was released in December 1995, and PTW versions of all SKM software will be available soon.
SKM has been a leader in the electrical engineering software industry for over 20 years.