LA120

This document is a comprehensive user guide for the Digital LA120 DECwriter III terminal, designed to help users understand its operation, installation, and programming. It is structured into six main chapters:

1. Operator Information: Details the terminal's console, including lights, keys, and numeric display. It explains SET-UP features for configuring form settings (length, margins, tabs, lines per inch), operator comfort features like auto repeat and bell volume, and various communication settings (baud rate, answerback, buffer control). This section also covers ribbon installation, print impression adjustment, paper loading, and troubleshooting.
2. Installation, Interface, and Specifications: Provides instructions for unpacking, inspecting, and checking out the terminal. It outlines the EIA interface, cabling, terminator impedance, and lists detailed specifications for the printer, keyboard, communication, physical characteristics, power requirements, environmental conditions, and paper types.
3. Programmer Information: Focuses on using escape sequences to control the LA120's functions, such as character sets, active column and line, horizontal and vertical pitch, margins, tabs, form length, and product identification. It also explains alternate keypad modes, control characters, and synchronization.
4. Communications: Describes full duplex (FDX) and half duplex (HDX) communication modes, including connection requirements, handling breaks, disconnect conditions, and modem SET-UP features.
5. Options: Covers the 20 mA LA12X-AL option, including installation, testing, and information on the LA12X-DL expanded buffer.
6. Accessories and Supplies: Lists and describes the various accessories and supplies available for the LA120 terminal, along with ordering information.

The guide is intended for both general operators and those needing detailed technical and programming information, with a strong emphasis on practical usage and configuration.