JRT (Jim Russell Tyson) is an implementation of the Pascal programming language. It was available in the early 1980s on the CP/M operating system. At the end of the 1970s, the most popular Pascal implementation for microcomputers was UCSD Pascal, which many people considered overpriced at hundreds of dollars. The original basis for UCSD Pascal was the p-machine compiler from ETH Zurich, the originators of Pascal.JRT was a Pascal interpreter by Jim Russell Tyson that compiled to its own pseudocode separate from UCSD Pascal p-code.