The VT55 Graphics Terminal...

This document describes the Digital Equipment Corporation VT55 Graphics Terminal, an interactive CRT terminal designed for a wide range of applications requiring graphics. The VT55 offers waveform graphics capability, displaying two graphs of up to 512 data points each with a screen resolution of 512 x 236, along with text. It includes cursors for data editing and graph generation, and can simultaneously display any combination of text and graphics. A key feature is its integrated electrolytic copier, allowing users to obtain hard copies of the screen display (both characters and graphs) with a single key press.

The terminal is highlighted as a versatile tool for laboratory research (e.g., plotting waveforms), education (Computer Aided Instruction), business (e.g., charting forecasts and trends), and industry (e.g., process control status displays), enhancing results through its graphics capabilities. It supports up to 1,920 characters in 24 lines, with a dedicated line for x-axis labels. The VT55 features an ergonomic screen, comprehensive cursor control, adjustable transmission speeds up to 9600 baud, and a familiar typewriter-style keyboard designed for efficient input. It operates silently without cooling fans but can provide audible keystroke feedback.

Software support for the VT55 includes the RT-11 real-time operating system, with specific functionalities available through RT-11/BASIC (including graphics commands like "CLEAR GRAPH") and FOCAL/RT-11. Installation is simple, requiring no special interfacing and connecting via standard 20mA current loop or EIA RS-232-C signals. Digital Equipment Corporation emphasizes its extensive experience in providing efficient and cost-effective graphics solutions, positioning the VT55 as another response to real-world application needs.