Letterprinter 100 Programmer Reference Manual

This document, the Letterprinter 100 Programmer Reference Manual (EK-LP100-RM-001), is intended for applications programmers. Its primary purpose is to provide detailed interface and character processing information for the Letterprinter 100 terminal.

The manual covers:

• Communication: Describes the terminal's serial character format, EIA interface, connection procedures, modem control, and methods for preventing input buffer overflows (including XON/XOFF flow control and fill time calculations).
• Character Processing: Explains how the terminal interprets and responds to various characters, including printable characters, C0 and C1 control characters, and special characters. It also details coding environments (7-bit and 8-bit) and character set selection.
• Escape and Control Sequences: Provides in-depth definitions for configuring the printer's behavior and settings, such as horizontal and vertical forms handling (print area, margins, pitch, tabs, form length), character style (quality selection, graphic rendition, character set designation and invocation), and reporting functions.
• ANSI String Processing: Details how the Letterprinter 100 processes ANSI control strings, including specifics on graphics mode operation (dot spacing, margins, printhead use) and answerback message encoding.