U/W FOCAL

This document is the manual for U/W FOCAL, an expanded version of PS/8 FOCAL designed by Jim van Zee at the University of Washington (1978). It provides increased command functionality, improved numerical precision, enhanced I/O handling, and specialized features for laboratory applications such as plotting and real-time control. The manual includes a comprehensive list of commands, arithmetic operators, internal functions, and instructions for customizing the interpreter through patches or adding user-defined functions.