VT125

This user guide provides comprehensive information on the DIGITAL VT125 graphics display terminal. The VT125 integrates alphanumeric capabilities (compatible with VT100) with a bit-map architecture, allowing it to function as a "smart terminal" that processes and displays graphics using the Remote Graphics Instruction Set (ReGIS). It also features a VT105 emulator.

The document is structured to serve installers, operators, and application programmers, covering:

• Operating Information: General use, controls, indicators (keyboard, visual, audible), and power-up self-tests.
• SET-UP Features: Configuration options for operator preferences, communication compatibility, and installation, including display settings, character sets, baud rates, and answerback messages.
• Character Processing: Details on character codes transmitted by the keyboard (standard, function, auxiliary) and how the terminal processes received characters, including ANSI and DEC private modes, control functions, and escape sequences.
• ReGIS Graphics Programming: An in-depth explanation of the ReGIS language, covering syntax, coordinate systems, commands for drawing geometric shapes (pixels, vectors, circles, arcs, curves), text manipulation (size, spacing, tilt), writing modes (complement, erase, replace, overlay), shading, patterns, and screen controls (scrolling, display addressing, macrographics).
• VT105 Emulation: How the VT125 operates in VT105 mode, particularly for drawing various types of graphs and histograms.
• Communications: Information on connecting to computer and auxiliary ports, serial data formats, and communication protocols.
• Installation & Maintenance: Guidance on setting up the terminal, environmental considerations, and troubleshooting common issues through self-tests and error codes.
• Options & Accessories: Details on installing hardware options like the 20 mA Current Loop and Advanced Video Option, and a list of available accessories and supplies.

Appendices offer further technical specifications, command summaries, character code listings, ANSI extension techniques, ReGIS compatibility guidelines, and information on the HLS color system.