FOCAL-GT/RT User's Manual

This manual describes FOCAL-GT/RT, a version of FOCAL-11 designed to interface with the GT40 graphics system and optionally the Laboratory Peripheral System (LPS).

Key features include: * Graphics functionality: Tools to create, display, and manipulate lines, points, characters, and light-pen interactions on the GT40 screen. * Terminal operations: Allows the GT40 to function as a terminal connected to a host computer, with capabilities to save, restore, and transfer FOCAL programs. * LPS Support: Functions for sampling analog channels, timer operations, and controlling the LPS numeric display. * System Configuration: Detailed instructions on assembling, loading, and customizing FOCAL-GT/RT binaries, including memory management and adding new functions.

The document includes technical appendices covering character sets, display file structure, error diagnostics, and a full command/function summary.