Argon (computer)

Argon (computer). The Argon was an influential early minicomputer system developed at the University of Illinois at Urbana-Champaign in the early 1970s. Primarily designed as a satellite processor for the massive ILLIAC IV supercomputer, it served as a critical user interface and graphics terminal. The system played a foundational role in computer graphics research and the development of interactive computing environments at the University of Illinois.

History

The Argon project was initiated in the late 1960s within the Department of Computer Science at the University of Illinois at Urbana-Champaign, led by researchers including Thomas A. DeFanti. Its development was directly tied to the Advanced Research Projects Agency-funded ILLIAC IV project, one of the first attempts at a massively parallel supercomputer. The Argon was conceived to offload interactive tasks from the main ILLIAC IV, which was better suited for large-scale numerical processing. Following its completion in 1972, the system was installed at the university's Computer-based Education Research Laboratory, where it became a central tool for pioneering work in computer-generated imagery and educational software.

Design and architecture

The Argon's hardware was built around a standard Digital Equipment Corporation PDP-11 minicomputer, which provided general-purpose processing. A key innovation was its integration of a high-resolution vector graphics display system, the Vector General 3, which was driven by a specialized display processor. User interaction was facilitated through a light pen, allowing direct manipulation of on-screen graphical elements. The system's core memory was expanded and interfaced with peripherals like magnetic tape drives for storage, creating a cohesive workstation dedicated to graphical computation.

Software and operating systems

The Argon did not run a conventional operating system but instead executed custom software developed at the University of Illinois at Urbana-Champaign. This software was designed to manage the vector display, light pen input, and communication with the ILLIAC IV. A significant software achievement was the GROPE system, an early project in haptic technology and force feedback. The programming environment supported the development of interactive graphical applications, laying groundwork for later systems at the University of Illinois, including the PLATO system and the ZGrass language.

Reception and legacy

The Argon was highly regarded within the niche field of early computer graphics research. It provided an unprecedented interactive graphical capability for academic researchers, influencing subsequent projects at the University of Illinois at Urbana-Champaign such as the Sayre Glove and the CAVE virtual reality environment. The system's architecture and philosophy directly informed the design of later graphics workstations. While not commercially marketed, its impact is evident in the careers of its developers, like Thomas A. DeFanti, who co-founded the Electronic Visualization Laboratory and contributed to the Star Wars (film) graphics.

Technical specifications

The central processing unit was a Digital Equipment Corporation PDP-11/45 minicomputer. It was equipped with 16 KB of core memory, which was substantial for the era. Graphics output was handled by a Vector General 3 display unit capable of drawing 20,000 short vectors per refresh. Primary storage utilized magnetic tape drives, and the system featured a dedicated interface for the ILLIAC IV. Input was primarily through a light pen, with secondary control via a standard keyboard. Category:University of Illinois at Urbana-Champaign Category:Minicomputers Category:Computer graphics