VT50 Video Terminal Users Manual

This manual serves as a comprehensive guide for operating and programming the VT50 Video Terminal, targeting both novice and experienced users.

Section 1, for novice users, covers the basic operation of the VT50. This includes initial setup like adjusting controls for transmission mode and rate, powering on, and basic text input using the keyboard. It explains how to use keys such as BACKSPACE, RETURN, LF (Line Feed), and TAB for typing and correcting errors, and introduces screen "scrolling" when text fills the display. It also familiarizes users with advanced features like Escape Sequences (e.g., ESC H to home the cursor, ESC K to erase a line) and Control Codes (e.g., CTRL G to sound a buzzer). The section concludes with instructions on connecting the VT50 to a computer, emphasizing switch settings for online operation and full duplex modes.

Section 2 provides an in-depth look at the VT50's internal workings and advanced features. It details the terminal's architecture, data transmission using 7-bit ASCII codes (including the impact of SHIFT and CTRL keys), and the processing of received characters and commands. Commands are executed immediately, while displayable characters are stored in memory (80 characters by 12 lines) and uppercase conversion occurs. It explains cursor control, memory management, and lists various ASCII control codes and Escape Sequences for actions like cursor movement, screen manipulation (erasing lines or screens), and enabling/disabling "Hold Screen Mode." The manual also specifies communication rates (baud rates from 75 to 9600) configurable via rotary switches, the purpose of "Hold Screen Mode" for controlling data flow (using XOFF/XON), parity checks for error detection, and the function of the BREAK key to interrupt data or reinitialize the terminal (CTRL BREAK). Finally, it includes a comprehensive list of VT50 specifications, covering physical dimensions, display properties, keyboard layout, audible signals, terminal modes, and communication standards.