Focal-8 Demonstration Programs

This document is a 1970 manual from the Digital Equipment Corporation that provides a collection of demonstration programs for the FOCAL-8 conversational language, designed for use on PDP-8/I and PDP-8/E computers.

The manual serves as a practical guide for users to explore the capabilities of FOCAL-8 through various examples categorized into four main sections:

• Display Routines: Includes programs for plotting figures like circles, figure-8s, and sine waves on a Teletype.
• Games and Quizzes: Features interactive simulations such as a Dice Game, King of Sumeria, a Literature Quiz, a Lunar Module landing simulator, a Management Game, a Perpetual Calendar, Towers of Hanoi, and a Word Game.
• Mathematical Routines: Divided into "Education" (Addition Exerciser, Numerical Relationships, Prime Factor/Number generators, Right Triangle calculations) and "Mathematics" (Curve fitting, base conversion, statistics, and various algebraic/arithmetic solvers).
• Problem Solving Routines: Covers practical business and scientific applications, including interest payments, inventory scheduling, network flow calculations (Max-Flow/Min-Cut), job scheduling (Minimize Late Jobs, Two Process Job Simulation), and scientific modeling (Schroedinger equation, Stock Market commissions).

Each routine is presented with an abstract, operational procedures, and a code listing, often accompanied by a sample of the program's output on a Teletype terminal.