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VT320

The VT320 is a video display terminal developed by (DEC) and introduced in 1987 as a successor to the , primarily designed for single-session text-oriented applications in environments. It features a 14-inch flat, antiglare screen capable of displaying , , or paper-white characters on 24 lines in either 80- or 132-column formats, with an additional 25th status line for system information. The terminal conforms to the ANSI X3.64 standard for character terminal control and provides full backward compatibility with earlier DEC models such as the , , and VT52. Key hardware components include the LK201 detachable keyboard, which offers 103 keys across multiple language variants, including 15 programmable function keys, , and editing controls for enhanced user interaction. Communication is handled via asynchronous full-duplex transmission over RS-232-C or DEC-423 interfaces, supporting baud rates from 75 to 19,200 bits per second, with two ports for and printer output. The is 1,200 horizontal pixels by 300 scan lines, and the includes features like a CRT saver that blanks the screen after 30 minutes of inactivity to reduce wear, along with four printing modes (normal, auto print, printer controller, and local controller) for versatile document handling. Notable for its compact design, the VT320 supported multinational character sets including DEC Multinational and ISO Latin-1, as well as 12 national replacement sets, making it suitable for use. It operated in temperatures from 10°C to 40°C and consumed up to 50 watts of power, with for storing user configurations. Priced at US$495 upon release in 1987, the VT320 was part of DEC's VT300 family, emphasizing improved , customizable setup options, and reliability for office and tasks.

Overview

Introduction

The VT320 is an ANSI standard introduced by (DEC) in August 1987. It served as a text-only device designed primarily for connecting users to mainframes and minicomputers through an serial interface, facilitating , display, and interaction in enterprise computing environments. At launch, the VT320 was priced at US$575, equivalent to approximately $1,590 in 2025 dollars after adjusting for inflation using the . Its core components included an 8031 , a 14-inch display capable of rendering text in 80×24 or 132×24 character formats, and an LK201-style for input. As part of DEC's VT series, the VT320 succeeded the and preceded the VT420, building on prior models by enhancing multinational character support while maintaining , including of and modes.

Key Specifications

The VT320 base model utilizes an 8031 as its central processor for handling operations and control functions.
SpecificationDetails
MemoryROM and RAM for buffer and character storage, enabling efficient handling of display data and setup configurations.
Display14-inch monochrome CRT with 1,200 × 300 resolution, supporting 25 lines of text (24 visible lines plus 1 status line).
Character resolution15 × 12 pixels per character in 80-column mode; 9 × 12 pixels in 132-column mode, allowing flexible text formatting while maintaining readability.
ConnectivityDual RS-232 ports (primary for host connection, auxiliary for printer or modem), with support for baud rates from 75 to 19,200 bps.
Power90–132 V or 180–264 V AC input, 50/60 Hz frequency, 50 W maximum consumption.
Dimensions and weight10 × 12.4 × 12.4 inches (H × W × D), approximately 19 lbs (including keyboard and tilt base for ergonomic adjustment).
KeyboardDetachable 103-key LK201 model featuring a numeric keypad, dedicated function keys, and modular design for easy replacement or customization.
The terminal's design emphasizes reliability in environments, with the auxiliary port facilitating integration with peripherals like printers for direct output.

History

Development

The development of the VT320 terminal began in the mid-1980s as part of Digital Equipment Corporation's (DEC) strategy to address competitive pressures in the ANSI terminal market, where low-cost alternatives from vendors like and TeleVideo had eroded DEC's dominance in the VT200 series segment. By the mid-1980s, DEC maintained a 60-80% in ANSI-compatible terminals but faced increasing challenges from these imitators offering similar functionality at reduced prices, prompting a focus on successors to the VT200 family that balanced cost efficiency with essential features. Key engineering goals for the VT320 emphasized reducing manufacturing costs while preserving ANSI X3.64 compatibility for control sequences, thereby ensuring seamless interoperability with DEC's VMS and UNIX-based systems. The design also aimed to enhance local editing capabilities, building on the VT200's foundation to support efficient screen-based data entry without sacrificing performance. To achieve cost savings, the engineering team selected the Intel 8031 microcontroller, an 8-bit processor that provided sufficient processing power for terminal operations at a lower expense than the Z80-based designs used in earlier models like the VT100. Internal DEC timelines positioned prototyping efforts around 1986, culminating in the VT320's announcement in August 1987, with a strong emphasis on to , , and modes to facilitate easy adoption by existing DEC customers. This compatibility was influenced by adherence to ANSI X3.64 standards, which standardized terminal control sequences and promoted broad system interoperability. The VT320's development thus represented DEC's targeted response to market dynamics, prioritizing affordability and standards compliance to sustain its leadership in video terminals.

Release and Market Impact

The VT320 was introduced in August 1987 as part of Equipment Corporation's (DEC) VT300 series of video terminals. First shipments began in September 1987, positioning it as an affordable entry-level option in the ANSI-compatible terminal market. Priced at $575 for the North American version, the VT320 undercut key competitors, including the WY-60 at $699 and the established DEC at $1,395. The WY-60 had been reduced to $599 in December 1986. The VT320's cost-effectiveness targeted cost-sensitive environments such as offices and libraries, particularly for users connected to DEC's VAX systems, emphasizing with prior VT series models to ease adoption. The terminal contributed to DEC's commercial resurgence in the late 1980s terminal market, where the company held a dominant 60-80% share of ANSI-compatible units. The VT300 family, led by the VT320, saw strong demand, bolstering DEC's position against cloning competitors. Its release accelerated industry-wide pushes toward ANSI and ISO standardization in terminal emulation protocols, influencing subsequent products from major vendors and expanding the ecosystem of compatible ASCII terminals.

Design and Features

Hardware Components

The VT320 terminal features a 14-inch () monitor as its primary display unit, utilizing a (, , or paper-white) for text rendering on a dark background. The is housed in a tiltable and swivelable base with an anti-glare coating to reduce reflections and enhance readability in various lighting conditions. This design allows users to adjust the for ergonomic comfort, integrating seamlessly with the terminal's overall functionality by supporting resolutions up to 132 columns by 24 lines, as briefly referenced in key specifications. The display has a of 1,200 horizontal pixels by 300 scan lines and consumes up to 50 . The is a detachable LK201 model, connected via a to the right side of the , providing flexible positioning during use. It includes a main typewriter-style , a 17-key (including PF1-PF4 and Enter), an editing with for cursor navigation, and 20 function keys (F6-F20) with 15 programmable, dedicated to application-specific commands. This supports efficient and , with four indicator lights for such as , lock, and functions. Internally, the VT320's motherboard employs an 8031 microcontroller as the central to manage terminal operations, including character processing and communication protocols. A custom DEC video controller handles display tasks such as generating scan lines, positioning the cursor, and rendering text attributes, ensuring smooth integration between the processor and the for reliable output. These components work together to process incoming serial data and drive the display without requiring external graphics hardware. Connectivity is facilitated through modular MMJ (Modified Modular Jack) ports on the rear panel, using 6-pin connectors for primary serial communication with host computers, terminal servers, or modems, adhering to the DEC-423 interface standard for robust signal transmission up to 300 meters. An auxiliary 25-pin D-sub connector provides an additional RS-232-C compatible port, often used for local printing or secondary host connections, allowing direct attachment of printers without host intervention. Cabling for these ports employs shielded twisted-pair wires to minimize interference. The terminal's build emphasizes durability with a rugged that encases the electronics and , protecting against everyday handling in office environments. Ventilation slots are incorporated around the high-voltage circuits to dissipate heat generated during operation, preventing overheating and extending component lifespan. This construction balances portability—at approximately 8.6 kg (terminal 6.6 kg, 2 kg)—with stability for prolonged use. Upon powering on, the VT320 executes a (POST) sequence that automatically diagnoses key internal components, including , , controller, and communication ports. If successful, the test completes silently with the screen ready for use; failures are indicated by error codes or patterns on the , such as specific character sequences or LED flashes on the , enabling quick . This integrated diagnostic process ensures reliable initialization before connecting to a host system.

Emulation and Compatibility

The VT320 provides full with the through support for s, enabling seamless integration with existing VT100-based applications. This includes features such as smooth scrolling via the DECSTBM (Set Top and Bottom Margins) sequence, protected fields using DECBI (Back Index) and DECFC (Forward Cursor), and origin mode controlled by the DECOM (Origin Mode) . For older DEC systems, the VT320 offers a compatibility mode as a basic fallback, handling simple text attributes like reverse video (ESC 7); bold and blink are not supported in VT52 mode. This mode ensures operation with legacy software designed for the , though it limits functionality to 7-bit controls without advanced ANSI features. The VT320 complies with the ANSI X3.64 standard for control functions, standardizing operations across compatible terminals. Key supported sequences include cursor addressing with n ; m H (where n and m specify row and column positions) and screen clearing via 2 J, which erases the entire display. This compliance facilitates with a wide range of host systems adhering to the same protocol. Emulation modes on the VT320 are user-selectable through the setup menus, accessible via the General Set-Up screen, or configurable via host commands sent over the communication line. While auto-detection for common protocols is not explicitly implemented, the terminal responds to mode-setting escape sequences from the to switch between , , and ANSI modes dynamically. In its base mode, the VT320 has no native support for extended graphics, restricting operations to text-only display and relying on alphanumeric character rendering without protocols like ReGIS or Sixel. Graphics capabilities are available only in the VT330 and VT340 variants.

Advanced Capabilities

The VT320 introduced several software features that enhanced user productivity by enabling offline text manipulation and efficient workflow management. One key capability was local editing, supported by a 24-line that allowed users to insert or delete lines and characters without immediate transmission to the host system. This offline modification feature, accessible via the editing keypad, facilitated corrections and revisions directly on the terminal before sending data, reducing network traffic and improving efficiency in tasks. The VT320 is a single-session terminal, but the auxiliary port can be reassigned for a second host connection, requiring external switching; advanced multi-session with screen division is in VT330/VT340 variants. In such configurations, users could switch between sessions for multitasking, such as monitoring one application while interacting with another. The VT320 supported page memory for holding multiple screens of data, configurable via setup, enabling quick recall and side-by-side comparison of content. Users could navigate these pages using control sequences to or jump between them, supporting tasks like reviewing logs or forms without losing context. The VT320 supported advanced character attributes including underline, reverse video, and half-intensity (faint) rendering, applied via ANSI escape sequences in the Select Graphic Rendition (SGR) mode, such as CSI 4 m for underline or CSI 2 m for half-intensity. These attributes, along with DEC-specific private modes for selective erase and protection (e.g., DECSCA), allowed precise visual emphasis and formatting in text-based applications. Printer integration provided flexible output options, including a local print screen function activated by the Print Screen key to capture the current display, and passthrough via the auxiliary port for direct host-to-printer transmission in controller mode. Compatible with asynchronous serial printers like DEC's LA50 and LA100 series, these features supported draft and letter-quality hardcopy without interrupting terminal operation. On-screen setup menus offered intuitive configuration for productivity features, accessed via the Set-Up key to display seven screens covering rates (up to 19,200), (even, odd, none), and session parameters like local or auto-repeat. Changes were saved in , ensuring persistent customization for , printing, and communication settings.

Variants

VT320 Base Model

The VT320 base model is a text-only video developed by (DEC), designed primarily for interacting with host systems running or UNIX operating systems in office environments. It supports standard ANSI X3.64 escape sequences and emulates earlier VT series terminals, including , VT200, and modes, with VT300 as the default for 7-bit or 8-bit control operations. Optimized for text-based applications, the terminal lacks support for protocols like ReGIS or formats like , focusing instead on efficient alphanumeric and input for tasks such as and program . The display features a -inch (35.6 cm) with a supporting 24 lines of 80 or 132 characters in normal operation, reducing to 14 lines during setup menus, and includes a configurable status line on the 25th line to show session details like cursor position, printer status, or host-writable indicators. Video attributes include reverse video, underline, bold, and , which can be combined, along with options for double-width or double-height lines and smooth or jump scrolling for enhanced readability in text-heavy workflows. Cursor styles are limited to a block or underline, emphasizing the 's text-centric design without advanced visual enhancements. Character handling is geared toward ASCII and ISO Latin-1 sets, with additional support for DEC Multinational encoding and up to 12 National Replacement Character Sets (NRCS) for European languages such as , , , and , selectable through the General Setup menu to accommodate localized text without altering the core 94- or 96-character grids. These NRCS options allow users to replace standard ASCII characters with national variants, improving in office settings for tasks involving non-English . The terminal also includes user-defined keys and soft character sets for custom configurations, but all output remains strictly text-based. Typical use cases for the VT320 base model include , programs, and general sessions in multi-user environments, where its reliable text processing and compatibility with serial connections to VMS or UNIX hosts provide straightforward connectivity for office productivity. Limitations are inherent in its text-only architecture, excluding any graphics rendering and restricting it to alphanumeric operations, which differentiates it from later variants with enhanced capabilities. Model variants include the -A2 for the market with 100-120 VAC and the -A3 for use with 220-240 VAC support, along with region-specific keyboards to match local layouts.

VT330

The VT330, introduced by in April 1987, was a variant priced at $1,995 for a single unit. It extended the text-based capabilities of the VT300 series by incorporating dedicated hardware, enabling support for and imagery while maintaining compatibility with standard terminal protocols. This made the VT330 suitable for environments requiring visual data representation beyond pure text, such as engineering workflows. Central to the VT330's graphics functionality was the ReGIS (Remote Graphics Instruction Set), which allowed for vector drawing, programmable macros, and filled shapes rendered in up to four from a palette of 64 possible intensities. The terminal also supported the format, a graphics protocol using 6-pixel-high by 1-pixel-wide cells to import and display images at resolutions up to 800 × 480 pixels, facilitating the integration of static visuals into terminal sessions. Additionally, it provided emulation for the Tektronix 4010 terminal, enabling plotter-style commonly used in scientific applications for plotting data curves and diagrams. The VT330 retained the 14-inch monochrome CRT display of the base VT320 but featured an enhanced display controller capable of operating in a 800 × 480 graphics mode, supporting two screens of graphics memory alongside six pages of text. This configuration proved valuable for use cases like previewing CAD designs and generating simple charts in engineering settings, where monochrome visuals provided sufficient detail without the complexity of color processing.

VT340

The VT340, introduced by (DEC) in April 1987, represented a significant advancement in the VT300 series by incorporating color graphics capabilities into the terminal lineup. Priced at $2,795 for the North American model, it was designed to support enhanced visual applications on DEC systems such as VAX computers, building on the monochrome graphics foundation of the VT330 while adding vibrant display options for more complex data representation. At the core of the VT340's enhancements was its RGB color display, capable of rendering 16 simultaneous colors selected from a 4096-color palette, enabling richer graphical outputs compared to prior models. The terminal supported the full ReGIS graphics protocol, which allowed for advanced features including color fills for shapes, variable line styles (such as solid, dotted, or dashed), and the integration of text within graphics modes to overlay labels or annotations directly on vector drawings. Additionally, the graphics format was extended with color mapping, permitting up to 16 colors per image through a that mapped data to the palette, facilitating bitmap-style visuals with hue, , and saturation (HLS) or RGB coordinate adjustments. These capabilities were powered by 256 KB of enhanced video , sufficient to store graphics buffers for dual sessions and maintain smooth rendering without frequent refreshes. The VT340 achieved a maximum graphics resolution of 800 × 500 pixels, offering higher fidelity than earlier terminals while remaining backward compatible with VT330 monochrome modes for seamless integration with existing software. This supported detailed plotting and , with the terminal's 13-inch screen providing clear visibility for professional use. In practice, the VT340 excelled in applications requiring color-coded data visualization, such as scientific charting or network diagrams, and served as an early platform for prototyping on DEC ecosystems, where developers could test interactive color interfaces before full adoption.

Legacy

Production End and Successors

The VT320 series entered production in , with the VT320 and VT330 models succeeded by the VT420 in 1990 as part of Digital Equipment Corporation's (DEC) transition to newer terminal architectures. The lineup achieved significant , with over 1 million VT300 family units installed globally by the early . Discontinuation of the core VT320 models occurred with the introduction of the VT420 in 1990, which succeeded them by incorporating advanced windowing features and multi-session support for up to two independent host connections. This was followed by the VT520 in 1994, a further evolution emphasizing enhanced monochrome text handling and broader compatibility. The VT340 variant, valued for its color graphics capabilities, remained in production longer—extending until the VT500 series debut in 1993–1994—due to ongoing demand for terminals supporting ReGIS and graphics standards. DEC's strategic pivot in the early reflected the growing dominance of personal computers and Windows, prompting a move toward hybrid PC-based terminals like the VT510, which featured a Windows-like setup for easier . By , amid declining demand for dedicated text terminals, DEC sold its entire text terminal business, including remaining VT series inventory and production rights, to SunRiver Data Systems for continued manufacturing under new ownership.

Modern Relevance

The VT320 continues to influence modern through software , enabling access to systems. Terminal emulators such as provide support for selected VT320 features, including advanced control sequences beyond , facilitating compatibility with older UNIX and environments. Similarly, offers robust VT-series , including VT320 modes, which allows users to connect to vintage DEC systems via SSH or for retro and application . Mintty, a popular terminal for and MSYS, implements VT320-specific elements like the host-writable status line, supporting multi-line status areas and aiding in the preservation of 1980s-era terminal interactions. In retro computing communities, the VT320 remains actively preserved, with enthusiasts restoring units for use with modern hardware. These communities discuss and implement modifications, such as intercepting the terminal's video signals (e.g., VIDEO1, VSYNC, HSYNC) and converting them via DACs and scalers like the GBS-8200 to drive LCD panels, replacing failing CRTs while retaining functionality. Such efforts keep the hardware operational for serial connections to emulated or original systems, as seen in forums dedicated to DEC equipment. The VT320 holds educational value in curricula focused on terminal history and standards like ANSI escape codes, where its support for sequences such as (Control Sequence Introducer) and SGR (Select Graphic Rendition) illustrates the evolution of text-based interfaces. Resources like programming manuals archived online serve as references for students learning about DEC's contributions to protocols, emphasizing concepts like dynamic sets and status lines. Culturally, the VT320 appeared in 1980s and 1990s depictions of , notably as a staple in online catalogs for book searches, evoking the era's shift to networked information access. Its design influences contemporary (CLI) tools, where emulators replicate VT320 behaviors like smooth scrolling and keypad functions to enhance in modern development environments. Vintage VT320 units are available on secondary markets like , with working models typically priced between $200 and $500 depending on condition and included accessories such as keyboards or manuals. Comprehensive documentation, including user guides and schematics, is preserved on archives like Bitsavers.org, supporting ongoing restoration and study.

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