MODV-Choice

This document outlines the usage and functionality of MODV-Choice, a utility for 8K FOCAL '69. It enables variables and text to reside in the upper 4K of field one. The software provides two versions: a 'General' version that protects the upper page of field one, and an 'N.B.L.' (Non-Protected) version that does not. Additionally, the program includes a feature to suppress echo on input from a keyboard or low-speed reader to prevent input buffer overflows. The documentation includes loading procedures, differences peculiar to the MODV version, and programming notes for assembly language subroutines.