General description (1978) The following is quoted from: Calma's computer-aided design and drafting systems (also referred to as interactive graphics systems) are component hardware modules, electronic interfaces, and software programs. Most of the systems sold are constructed by combining available components to meet the requirements of the customers' specific design or drafting application. Calma's systems enable customers to automate a wide variety of design and manufacturing processes which have previously been performed manually. The primary hardware components of a system are a
central processing unit, operator stations and plotter outputs. Their GDS I and II software operated on Data General Corporation's Nova and Eclipse line of 16 bit mini Computers. Sketches or layouts of electronic system were first manually drawn on
mylar or paper to scale and were placed on large backlit 48 by 60 inch table digitizers. Using a moving
stylus, these layouts were organized in layers, first placing the smaller common and custom circuits, created in a library, then manually traced their interconnecting circuitry on further layers, the completed layout then stored in computer files. Printed Circuit Boards (PCB's) and Small Scale Integrated Circuits (SSIC) were manually traced buy an operator, usually a draftsman or electronic engineer then plotted on a large
pen plotter (In later years to faster Electrostatic Plotters) to be visually inspected to confirm that the physical layout properly matched the schematic. Once the layout and schematics final edits were manually checked to confirm their accuracy, the multiple layers of the physical circuitry were sent to a film plotter to create masks for fabrication. The central processing unit consists of a minicomputer, a computer console and page printer, a magnetic tape transport and a
magnetic disk memory unit. Other optional peripheral devices such as
card readers and
paper tape punches are also available. These components are interfaced with Calma-designed and manufactured controllers, and integrated into a single unit with system software designed and programmed by Calma. An operator station consists of a digitizing device, an interactive
cathode ray tube (CRT) display unit, coordinate readouts and a keyboard. The main difference between stations is in the type of digitizing input station used. The Calma digitizer is a backlit 48 by 60 inch table. To digitize analog graphical data directly on computer-compatible medium, the operator of the digitizer manually traces graphical data with a moveable stylus. The
graphic tablet has a smaller surface and is operated with an
electromechanical graphic pen and were used primary to edit an electronic layout once it was digitized. The digitizing input station is linked by system software to the CRT display, which allows an almost instantaneous display of any segment of the source drawing or a graphic element from the library. The CRT display also has windowing and magnification capability. An
alphanumeric keyboard is used for entering text, scaling information, dimensions and commands, and an optional functional keyboard is available for entering frequently used functions, symbols and
macro commands. The output most commonly used in Calma's systems is a graphic plotter. Calma software supports both on and off-line pen and photo plotting devices. Calma's computer-aided design systems are used in a wide variety of applications. To date systems have been sold principally to electronics firms for use in the design of integrated circuits, printed circuit boards and electrical schematics; to governmental agencies and public utilities for use in
cartographic applications; and to manufacturing companies for use in the design of mechanical parts and systems.
Calmagraphics/CGI GDS GDS II For an overview of the GDS II system as it was 1981, see. Some scanned product documents can be found at and. The original GDS system used Data General mini-computers to digitize and assemble chip designs. The UI consisted of simple one or two letter commands, and a set of colored lights as a response. The operator typed a command, and if the green light came on, it was successful. GDSII introduced an actual Command Line Interface (CLI), where the user typed commands that were echoed back to the screen. GDS systems had no text screen at all, just a "green-screen"
oscilloscope type display. GDSII introduced a text display, using a regular text terminal in addition to the 'scope screen, and also introduced the first color screens. This ushered in the new method of "online design", where the drafting employees actually sat at the screen and drew the chips. In the older GDS systems, an operator took the mylar drawings and digitized them in. A typical GDSII system in 1980 would have a 300 MB disk, 1-2 MB of memory, using a
16-bit DG minicomputer and up to 4 screens. This cost over $500,000 in 1980 dollars.
DDM DDM (short for "Design, Drafting, Manufacturing") was a 3-dimensional
wireframe computer-aided design application. In the mid-1980s, it was one of the top ten selling CAD packages on the market. By 2006, DDM continued to be supported by Parametric Technology Corporation as "Dimension III". The General Motors Central Foundry Division (GM-CFD) had applied DDM to the design of castings and tooling for automotive components such as
engine blocks,
cylinder heads and
steering knuckles. DDM was run on Calma's proprietary dual-monitor
workstation hardware connected to
Data General Nova and later
Digital VAX 11/780-series computers. GM-CFD had DDM installations in
Saginaw, MI,
Pontiac, MI,
Defiance, OH,
Bedford, IN,
Danville, IL and
Massena, NY. == References ==