VT 240 Series Programmer Reference Manual

This Programmer Reference Manual provides comprehensive information for programmers to utilize the features of the Digital Equipment Corporation (DEC) VT240 Series terminal. It details the terminal's capabilities, operating modes, and communication environment. The document covers character encoding schemes, including 7-bit and 8-bit ASCII, multinational, and special graphics sets, along with their associated control functions. It specifies codes transmitted from the keyboard (keypad, function, and control keys) and the terminal's responses to received codes, detailing various operational modes (e.g., cursor, scrolling, print, editing), character rendition, and user-defined keys.

A significant portion is dedicated to programming using the Remote Graphics Instruction Set (ReGIS) for creating and manipulating graphic images through commands for positioning, drawing (vectors, curves), text, screen control, polygon fills, and macrographs. Additionally, the manual describes the VT240's Tektronix 4010/4014 emulation mode, outlining its specific features, restrictions, screen addressing, and control sequences for graphics. Appendices offer compatibility differences with other DEC terminals (VT102, VT125), suggest further documentation, and provide guidance on using control codes.