VT330/VT340 Programmer Reference Manual Volume 2

This document is the second volume of a two-volume programmer reference manual for the Digital VT330 and VT340 video terminals, focusing on graphics programming. It provides information for programmers to utilize the graphics features of these terminals.

The manual is structured into four main parts:

1. ReGIS Programming (Chapters 1-12): This section details commands and procedures for the ReGIS graphics protocol, a instruction set from Digital for creating graphic images using geometric forms, text, and shading. It covers topics like ReGIS command syntax, screen control, write control, position, vector, curve, text, load, macrograph, report, and polygon fill commands, as well as combining ReGIS commands for complex images.
2. Tektronix 4010/4014 Emulation (Chapter 13): This part describes how to configure the terminal to run software designed for Tektronix 4010/4014 terminals, including supported features, restrictions, operating modes (Alpha, Graph, Incremental Plot, Point Plot, GIN), control characters, and escape sequences.
3. Sixel Graphics (Chapter 14): This section explains Sixel graphics, a method for representing graphic images as vertical columns of six pixels, often used for character fonts. It covers Sixel data format, control functions, and scrolling modes.
4. Using Locator Devices and Printing Graphics (Chapters 15-16): This part instructs on programming the terminal for use with locator devices (mouse or graphics tablet) for cursor movement and data input, and how to specify formats for printing graphics from the terminal, including various print modes and Sixel graphics levels.

The VT330 uses a 2-plane bitmap (4 shades of gray) for its monochrome monitor, while the VT340 uses a 4-plane bitmap (16 colors/shades) for its color monitor, both with a display area of 800x480 pixels. The document provides conventions for using ReGIS commands and examples throughout the chapters.